Enable strict mode in test files

Signed-off-by: Maurício Meneghini Fauth <mauriciofauth@gmail.com>

221 files changed, 463 insertions, 63 deletions

diff --git a/test/Environment_test.php b/test/Environment_test.php
index 662d773b4b..f36b0f9813 100644
--- a/test/Environment_test.php
+++ b/test/Environment_test.php
@@ -5,6 +5,7 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
 
 /**
  *
diff --git a/test/bootstrap-dist.php b/test/bootstrap-dist.php
index cbe3289c3e..b22ddaf5eb 100644
--- a/test/bootstrap-dist.php
+++ b/test/bootstrap-dist.php
@@ -5,13 +5,14 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
 
 /**
  * Set precision to sane value, with higher values
  * things behave slightly unexpectedly, for example
  * round(1.2, 2) returns 1.199999999999999956.
  */
-ini_set('precision', 14);
+ini_set('precision', '14');
 
 // Let PHP complain about all errors
 error_reporting(E_ALL);
@@ -21,7 +22,7 @@ date_default_timezone_set('UTC');
 
 // Adding phpMyAdmin sources to include path
 set_include_path(
-    get_include_path() . PATH_SEPARATOR . dirname(realpath("../index.php"))
+    get_include_path() . PATH_SEPARATOR . dirname((string) realpath("../index.php"))
 );
 
 // Setting constants for testing
diff --git a/test/classes/AdvisorTest.php b/test/classes/AdvisorTest.php
index 219428dc4b..3ef931d840 100644
--- a/test/classes/AdvisorTest.php
+++ b/test/classes/AdvisorTest.php
@@ -5,6 +5,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests;
 
 use PhpMyAdmin\Advisor;
diff --git a/test/classes/BookmarkTest.php b/test/classes/BookmarkTest.php
index f2fe9b9ac9..ac4a11ff8f 100644
--- a/test/classes/BookmarkTest.php
+++ b/test/classes/BookmarkTest.php
@@ -5,6 +5,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests;
 
 use PhpMyAdmin\Bookmark;
diff --git a/test/classes/BrowseForeignersTest.php b/test/classes/BrowseForeignersTest.php
index 9dcb7eee5e..231546b5bc 100644
--- a/test/classes/BrowseForeignersTest.php
+++ b/test/classes/BrowseForeignersTest.php
@@ -5,6 +5,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests;
 
 use PhpMyAdmin\BrowseForeigners;
diff --git a/test/classes/CentralColumnsTest.php b/test/classes/CentralColumnsTest.php
index 196fe12a2f..eeb0286600 100644
--- a/test/classes/CentralColumnsTest.php
+++ b/test/classes/CentralColumnsTest.php
@@ -5,6 +5,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests;
 
 use PhpMyAdmin\CentralColumns;
diff --git a/test/classes/CharsetsTest.php b/test/classes/CharsetsTest.php
index 626a99a276..823e4e4353 100644
--- a/test/classes/CharsetsTest.php
+++ b/test/classes/CharsetsTest.php
@@ -5,6 +5,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests;
 
 use PhpMyAdmin\Charsets;
diff --git a/test/classes/CheckUserPrivilegesTest.php b/test/classes/CheckUserPrivilegesTest.php
index 981b090fee..4638a040d6 100644
--- a/test/classes/CheckUserPrivilegesTest.php
+++ b/test/classes/CheckUserPrivilegesTest.php
@@ -5,6 +5,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests;
 
 use PhpMyAdmin\CheckUserPrivileges;
diff --git a/test/classes/Config/ConfigFileTest.php b/test/classes/Config/ConfigFileTest.php
index da6d84e142..52cfd8de05 100644
--- a/test/classes/Config/ConfigFileTest.php
+++ b/test/classes/Config/ConfigFileTest.php
@@ -5,6 +5,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests\Config;
 
 use PhpMyAdmin\Config\ConfigFile;
diff --git a/test/classes/Config/DescriptionTest.php b/test/classes/Config/DescriptionTest.php
index 8745161eb3..e25205f394 100644
--- a/test/classes/Config/DescriptionTest.php
+++ b/test/classes/Config/DescriptionTest.php
@@ -5,6 +5,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests\Config;
 
 use PhpMyAdmin\Config;
diff --git a/test/classes/Config/FormDisplayTemplateTest.php b/test/classes/Config/FormDisplayTemplateTest.php
index 74e61fbeca..7b10969792 100644
--- a/test/classes/Config/FormDisplayTemplateTest.php
+++ b/test/classes/Config/FormDisplayTemplateTest.php
@@ -5,6 +5,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests\Config;
 
 use PhpMyAdmin\Config;
diff --git a/test/classes/Config/FormDisplayTest.php b/test/classes/Config/FormDisplayTest.php
index 80baff36e6..37e5cb03a8 100644
--- a/test/classes/Config/FormDisplayTest.php
+++ b/test/classes/Config/FormDisplayTest.php
@@ -5,6 +5,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests\Config;
 
 use PhpMyAdmin\Config;
diff --git a/test/classes/Config/FormTest.php b/test/classes/Config/FormTest.php
index e1e6353294..89760a9874 100644
--- a/test/classes/Config/FormTest.php
+++ b/test/classes/Config/FormTest.php
@@ -5,6 +5,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests\Config;
 
 use PhpMyAdmin\Config;
diff --git a/test/classes/Config/Forms/FormListTest.php b/test/classes/Config/Forms/FormListTest.php
index f2f39194ce..855a2ed44d 100644
--- a/test/classes/Config/Forms/FormListTest.php
+++ b/test/classes/Config/Forms/FormListTest.php
@@ -5,6 +5,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests\Config\Forms;
 
 use PhpMyAdmin\Config;
diff --git a/test/classes/Config/PageSettingsTest.php b/test/classes/Config/PageSettingsTest.php
index 677336d323..da847f16c7 100644
--- a/test/classes/Config/PageSettingsTest.php
+++ b/test/classes/Config/PageSettingsTest.php
@@ -5,6 +5,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests\Config;
 
 use PhpMyAdmin\Config;
diff --git a/test/classes/Config/ServerConfigChecksTest.php b/test/classes/Config/ServerConfigChecksTest.php
index e84c9fe343..f32d3a39af 100644
--- a/test/classes/Config/ServerConfigChecksTest.php
+++ b/test/classes/Config/ServerConfigChecksTest.php
@@ -5,6 +5,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests\Config;
 
 use PhpMyAdmin\Config;
diff --git a/test/classes/ConfigTest.php b/test/classes/ConfigTest.php
index 63d16d5c96..681ed5f65a 100644
--- a/test/classes/ConfigTest.php
+++ b/test/classes/ConfigTest.php
@@ -6,6 +6,8 @@
  * @package PhpMyAdmin-test
  * @group current
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests;
 
 use PhpMyAdmin\Config;
diff --git a/test/classes/Controllers/Database/DatabaseStructureControllerTest.php b/test/classes/Controllers/Database/DatabaseStructureControllerTest.php
index 7168e71550..41a6b17177 100644
--- a/test/classes/Controllers/Database/DatabaseStructureControllerTest.php
+++ b/test/classes/Controllers/Database/DatabaseStructureControllerTest.php
@@ -7,6 +7,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests\Controllers\Database;
 
 use PhpMyAdmin\Controllers\Database\DatabaseStructureController;
diff --git a/test/classes/Controllers/Server/ServerBinlogControllerTest.php b/test/classes/Controllers/Server/ServerBinlogControllerTest.php
index 4593ddf82a..e0aa025a8c 100644
--- a/test/classes/Controllers/Server/ServerBinlogControllerTest.php
+++ b/test/classes/Controllers/Server/ServerBinlogControllerTest.php
@@ -5,6 +5,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests\Controllers\Server;
 
 use PhpMyAdmin\Controllers\Server\ServerBinlogController;
diff --git a/test/classes/Controllers/Server/ServerCollationsControllerTest.php b/test/classes/Controllers/Server/ServerCollationsControllerTest.php
index 6550543158..8621c8b370 100644
--- a/test/classes/Controllers/Server/ServerCollationsControllerTest.php
+++ b/test/classes/Controllers/Server/ServerCollationsControllerTest.php
@@ -5,6 +5,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests\Controllers\Server;
 
 use PhpMyAdmin\Controllers\Server\ServerCollationsController;
diff --git a/test/classes/Controllers/Server/ServerDatabasesControllerTest.php b/test/classes/Controllers/Server/ServerDatabasesControllerTest.php
index 8ff219ba60..18bd6fb25b 100644
--- a/test/classes/Controllers/Server/ServerDatabasesControllerTest.php
+++ b/test/classes/Controllers/Server/ServerDatabasesControllerTest.php
@@ -5,6 +5,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests\Controllers\Server;
 
 use PhpMyAdmin\Charsets;
diff --git a/test/classes/Controllers/Server/ServerEnginesControllerTest.php b/test/classes/Controllers/Server/ServerEnginesControllerTest.php
index 80c27177a7..fd0e48a0da 100644
--- a/test/classes/Controllers/Server/ServerEnginesControllerTest.php
+++ b/test/classes/Controllers/Server/ServerEnginesControllerTest.php
@@ -5,6 +5,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests\Controllers\Server;
 
 use PhpMyAdmin\Controllers\Server\ServerEnginesController;
diff --git a/test/classes/Controllers/Server/ServerPluginsControllerTest.php b/test/classes/Controllers/Server/ServerPluginsControllerTest.php
index 1592b98e6a..8c4869ad85 100644
--- a/test/classes/Controllers/Server/ServerPluginsControllerTest.php
+++ b/test/classes/Controllers/Server/ServerPluginsControllerTest.php
@@ -5,6 +5,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests\Controllers\Server;
 
 use PhpMyAdmin\Controllers\Server\ServerPluginsController;
diff --git a/test/classes/Controllers/Server/ServerVariablesControllerTest.php b/test/classes/Controllers/Server/ServerVariablesControllerTest.php
index 776b2a81f4..9c280a22ba 100644
--- a/test/classes/Controllers/Server/ServerVariablesControllerTest.php
+++ b/test/classes/Controllers/Server/ServerVariablesControllerTest.php
@@ -5,6 +5,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests\Controllers\Server;
 
 use PhpMyAdmin\Core;
diff --git a/test/classes/Controllers/Table/TableIndexesControllerTest.php b/test/classes/Controllers/Table/TableIndexesControllerTest.php
index 5a22baf45a..e098710c75 100644
--- a/test/classes/Controllers/Table/TableIndexesControllerTest.php
+++ b/test/classes/Controllers/Table/TableIndexesControllerTest.php
@@ -5,6 +5,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests\Controllers\Table;
 
 use PhpMyAdmin\Controllers\Table\TableIndexesController;
diff --git a/test/classes/Controllers/Table/TableRelationControllerTest.php b/test/classes/Controllers/Table/TableRelationControllerTest.php
index bea6c91deb..368690ba1c 100644
--- a/test/classes/Controllers/Table/TableRelationControllerTest.php
+++ b/test/classes/Controllers/Table/TableRelationControllerTest.php
@@ -5,6 +5,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests\Controllers\Table;
 
 use PhpMyAdmin\Di\Container;
diff --git a/test/classes/Controllers/Table/TableSearchControllerTest.php b/test/classes/Controllers/Table/TableSearchControllerTest.php
index d52c896976..f9db5ee44e 100644
--- a/test/classes/Controllers/Table/TableSearchControllerTest.php
+++ b/test/classes/Controllers/Table/TableSearchControllerTest.php
@@ -5,6 +5,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests\Controllers\Table;
 
 use PhpMyAdmin\Controllers\Table\TableSearchController;
diff --git a/test/classes/Controllers/Table/TableStructureControllerTest.php b/test/classes/Controllers/Table/TableStructureControllerTest.php
index db9cf52faf..658d6363c4 100644
--- a/test/classes/Controllers/Table/TableStructureControllerTest.php
+++ b/test/classes/Controllers/Table/TableStructureControllerTest.php
@@ -7,6 +7,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests\Controllers\Table;
 
 use PhpMyAdmin\Di\Container;
diff --git a/test/classes/CoreTest.php b/test/classes/CoreTest.php
index 7f38a8cb8c..5826cfb5d8 100644
--- a/test/classes/CoreTest.php
+++ b/test/classes/CoreTest.php
@@ -5,6 +5,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests;
 
 use PhpMyAdmin\Config;
diff --git a/test/classes/CreateAddFieldTest.php b/test/classes/CreateAddFieldTest.php
index a2916debd2..bcb7c718ab 100644
--- a/test/classes/CreateAddFieldTest.php
+++ b/test/classes/CreateAddFieldTest.php
@@ -5,6 +5,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests;
 
 use PhpMyAdmin\CreateAddField;
diff --git a/test/classes/Database/Designer/CommonTest.php b/test/classes/Database/Designer/CommonTest.php
index abbcaa5f05..75c919ea23 100644
--- a/test/classes/Database/Designer/CommonTest.php
+++ b/test/classes/Database/Designer/CommonTest.php
@@ -4,6 +4,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests\Database\Designer;
 
 use PhpMyAdmin\Database\Designer\Common;
diff --git a/test/classes/Database/DesignerTest.php b/test/classes/Database/DesignerTest.php
index 51d705740a..a2476faf6e 100644
--- a/test/classes/Database/DesignerTest.php
+++ b/test/classes/Database/DesignerTest.php
@@ -4,6 +4,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests\Database;
 
 use PhpMyAdmin\Database\Designer;
diff --git a/test/classes/Database/QbeTest.php b/test/classes/Database/QbeTest.php
index 7cde83b448..b99dbcd5b5 100644
--- a/test/classes/Database/QbeTest.php
+++ b/test/classes/Database/QbeTest.php
@@ -4,6 +4,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests\Database;
 
 use PhpMyAdmin\Database\Qbe;
diff --git a/test/classes/Database/SearchTest.php b/test/classes/Database/SearchTest.php
index 93dfd3c5a0..202399d82f 100644
--- a/test/classes/Database/SearchTest.php
+++ b/test/classes/Database/SearchTest.php
@@ -4,6 +4,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests\Database;
 
 use PhpMyAdmin\Database\Search;
diff --git a/test/classes/DatabaseInterfaceTest.php b/test/classes/DatabaseInterfaceTest.php
index d0648a2c4e..cf5615dcb3 100644
--- a/test/classes/DatabaseInterfaceTest.php
+++ b/test/classes/DatabaseInterfaceTest.php
@@ -5,6 +5,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests;
 
 use PhpMyAdmin\DatabaseInterface;
diff --git a/test/classes/Dbi/DbiMysqliTest.php b/test/classes/Dbi/DbiMysqliTest.php
index 10c85ea93a..1a0ad5c769 100644
--- a/test/classes/Dbi/DbiMysqliTest.php
+++ b/test/classes/Dbi/DbiMysqliTest.php
@@ -5,6 +5,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests\Dbi;
 
 use PhpMyAdmin\Dbi\DbiMysqli;
diff --git a/test/classes/Di/ContainerExceptionTest.php b/test/classes/Di/ContainerExceptionTest.php
index 5700869ea3..2245d6648f 100644
--- a/test/classes/Di/ContainerExceptionTest.php
+++ b/test/classes/Di/ContainerExceptionTest.php
@@ -5,6 +5,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests\Di;
 
 use PhpMyAdmin\Di\ContainerException;
diff --git a/test/classes/Di/ContainerTest.php b/test/classes/Di/ContainerTest.php
index 4500ffc3bf..96f8ad2307 100644
--- a/test/classes/Di/ContainerTest.php
+++ b/test/classes/Di/ContainerTest.php
@@ -5,6 +5,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests\Di;
 
 use PhpMyAdmin\Di\Container;
diff --git a/test/classes/Di/NotFoundExceptionTest.php b/test/classes/Di/NotFoundExceptionTest.php
index 4849d6c8f9..21fd9b0337 100644
--- a/test/classes/Di/NotFoundExceptionTest.php
+++ b/test/classes/Di/NotFoundExceptionTest.php
@@ -5,6 +5,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests\Di;
 
 use PhpMyAdmin\Di\NotFoundException;
diff --git a/test/classes/Display/ChangePasswordTest.php b/test/classes/Display/ChangePasswordTest.php
index a39c3877f8..51b3c4c282 100644
--- a/test/classes/Display/ChangePasswordTest.php
+++ b/test/classes/Display/ChangePasswordTest.php
@@ -5,6 +5,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests\Display;
 
 use PhpMyAdmin\Config;
diff --git a/test/classes/Display/CreateTableTest.php b/test/classes/Display/CreateTableTest.php
index 3646f5915d..ba054c56c0 100644
--- a/test/classes/Display/CreateTableTest.php
+++ b/test/classes/Display/CreateTableTest.php
@@ -5,6 +5,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests\Display;
 
 use PhpMyAdmin\Display\CreateTable;
diff --git a/test/classes/Display/ExportTest.php b/test/classes/Display/ExportTest.php
index 6021518503..817b461680 100644
--- a/test/classes/Display/ExportTest.php
+++ b/test/classes/Display/ExportTest.php
@@ -5,6 +5,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests\Display;
 
 use PhpMyAdmin\Core;
diff --git a/test/classes/Display/ResultsTest.php b/test/classes/Display/ResultsTest.php
index 1326168f2e..ce490fabf8 100644
--- a/test/classes/Display/ResultsTest.php
+++ b/test/classes/Display/ResultsTest.php
@@ -4,6 +4,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests\Display;
 
 use PhpMyAdmin\Config;
diff --git a/test/classes/EncodingTest.php b/test/classes/EncodingTest.php
index 991b1168ee..418b69d4aa 100644
--- a/test/classes/EncodingTest.php
+++ b/test/classes/EncodingTest.php
@@ -5,6 +5,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests;
 
 use PhpMyAdmin\Encoding;
diff --git a/test/classes/Engines/BdbTest.php b/test/classes/Engines/BdbTest.php
index 723242e7bb..f3e19bfb24 100644
--- a/test/classes/Engines/BdbTest.php
+++ b/test/classes/Engines/BdbTest.php
@@ -4,6 +4,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests\Engines;
 
 use PhpMyAdmin\Engines\Bdb;
diff --git a/test/classes/Engines/BinlogTest.php b/test/classes/Engines/BinlogTest.php
index 714d464006..9d8caa436f 100644
--- a/test/classes/Engines/BinlogTest.php
+++ b/test/classes/Engines/BinlogTest.php
@@ -4,6 +4,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests\Engines;
 
 use PhpMyAdmin\Engines\Binlog;
diff --git a/test/classes/Engines/InnodbTest.php b/test/classes/Engines/InnodbTest.php
index a14d7b1391..5eb9ad5399 100644
--- a/test/classes/Engines/InnodbTest.php
+++ b/test/classes/Engines/InnodbTest.php
@@ -4,6 +4,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests\Engines;
 
 use PhpMyAdmin\Engines\Innodb;
diff --git a/test/classes/Engines/MemoryTest.php b/test/classes/Engines/MemoryTest.php
index e8eb3a2292..f87dee0fea 100644
--- a/test/classes/Engines/MemoryTest.php
+++ b/test/classes/Engines/MemoryTest.php
@@ -4,6 +4,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests\Engines;
 
 use PhpMyAdmin\Engines\Memory;
diff --git a/test/classes/Engines/MrgMyisamTest.php b/test/classes/Engines/MrgMyisamTest.php
index 16453be860..88ce5b6e91 100644
--- a/test/classes/Engines/MrgMyisamTest.php
+++ b/test/classes/Engines/MrgMyisamTest.php
@@ -4,6 +4,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests\Engines;
 
 use PhpMyAdmin\Engines\MrgMyisam;
diff --git a/test/classes/Engines/MyisamTest.php b/test/classes/Engines/MyisamTest.php
index 11a00ad2ac..06a6105b5e 100644
--- a/test/classes/Engines/MyisamTest.php
+++ b/test/classes/Engines/MyisamTest.php
@@ -4,6 +4,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests\Engines;
 
 use PhpMyAdmin\Engines\Myisam;
diff --git a/test/classes/Engines/NdbclusterTest.php b/test/classes/Engines/NdbclusterTest.php
index 178c6e952e..22ea71f805 100644
--- a/test/classes/Engines/NdbclusterTest.php
+++ b/test/classes/Engines/NdbclusterTest.php
@@ -4,6 +4,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests\Engines;
 
 use PhpMyAdmin\Engines\Ndbcluster;
diff --git a/test/classes/Engines/PbxtTest.php b/test/classes/Engines/PbxtTest.php
index 9f29123c6c..8532266103 100644
--- a/test/classes/Engines/PbxtTest.php
+++ b/test/classes/Engines/PbxtTest.php
@@ -5,6 +5,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests\Engines;
 
 use PhpMyAdmin\Core;
diff --git a/test/classes/ErrorHandlerTest.php b/test/classes/ErrorHandlerTest.php
index 56cdc579ae..e369113002 100644
--- a/test/classes/ErrorHandlerTest.php
+++ b/test/classes/ErrorHandlerTest.php
@@ -4,6 +4,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests;
 
 use PhpMyAdmin\ErrorHandler;
diff --git a/test/classes/ErrorTest.php b/test/classes/ErrorTest.php
index ee588eed12..cefb8fbea1 100644
--- a/test/classes/ErrorTest.php
+++ b/test/classes/ErrorTest.php
@@ -5,6 +5,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests;
 
 use PhpMyAdmin\Error;
@@ -32,7 +34,7 @@ class ErrorTest extends PmaTestCase
      */
     protected function setUp()
     {
-        $this->object = new Error('2', 'Compile Error', 'error.txt', 15);
+        $this->object = new Error(2, 'Compile Error', 'error.txt', 15);
     }
 
     /**
diff --git a/test/classes/ExportTest.php b/test/classes/ExportTest.php
index 0f27626bc6..4e9131229f 100644
--- a/test/classes/ExportTest.php
+++ b/test/classes/ExportTest.php
@@ -5,6 +5,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests;
 
 use PhpMyAdmin\Export;
diff --git a/test/classes/FileTest.php b/test/classes/FileTest.php
index 8aa92154c7..bd57e0b2d6 100644
--- a/test/classes/FileTest.php
+++ b/test/classes/FileTest.php
@@ -5,6 +5,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests;
 
 use PhpMyAdmin\File;
diff --git a/test/classes/FontTest.php b/test/classes/FontTest.php
index fb33a4b79e..13d27971ed 100644
--- a/test/classes/FontTest.php
+++ b/test/classes/FontTest.php
@@ -4,6 +4,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests;
 
 use PhpMyAdmin\Font;
@@ -39,115 +41,115 @@ class FontTest extends PmaTestCase
         // empty string
         $this->assertEquals(
             0,
-            $this->font->getStringWidth("", "arial", "10")
+            $this->font->getStringWidth("", "arial", 10)
         );
 
         // empty string
         $this->assertEquals(
             3,
-            $this->font->getStringWidth(" ", "arial", "10")
+            $this->font->getStringWidth(" ", "arial", 10)
         );
 
         // string "a"
         $this->assertEquals(
             6,
-            $this->font->getStringWidth("a", "arial", "10")
+            $this->font->getStringWidth("a", "arial", 10)
         );
 
         // string "aa"
         $this->assertEquals(
             12,
-            $this->font->getStringWidth("aa", "arial", "10")
+            $this->font->getStringWidth("aa", "arial", 10)
         );
 
         // string "i"
         $this->assertEquals(
             3,
-            $this->font->getStringWidth("i", "arial", "10")
+            $this->font->getStringWidth("i", "arial", 10)
         );
 
         // string "f"
         $this->assertEquals(
             3,
-            $this->font->getStringWidth("f", "arial", "10")
+            $this->font->getStringWidth("f", "arial", 10)
         );
 
         // string "t"
         $this->assertEquals(
             3,
-            $this->font->getStringWidth("t", "arial", "10")
+            $this->font->getStringWidth("t", "arial", 10)
         );
 
         // string "if"
         $this->assertEquals(
             5,
-            $this->font->getStringWidth("if", "arial", "10")
+            $this->font->getStringWidth("if", "arial", 10)
         );
 
         // string "it"
         $this->assertEquals(
             6,
-            $this->font->getStringWidth("it", "arial", "10")
+            $this->font->getStringWidth("it", "arial", 10)
         );
 
         // string "r"
         $this->assertEquals(
             4,
-            $this->font->getStringWidth("r", "arial", "10")
+            $this->font->getStringWidth("r", "arial", 10)
         );
 
         // string "1"
         $this->assertEquals(
             5,
-            $this->font->getStringWidth("1", "arial", "10")
+            $this->font->getStringWidth("1", "arial", 10)
         );
 
         // string "c"
         $this->assertEquals(
             5,
-            $this->font->getStringWidth("c", "arial", "10")
+            $this->font->getStringWidth("c", "arial", 10)
         );
 
         // string "F"
         $this->assertEquals(
             7,
-            $this->font->getStringWidth("F", "arial", "10")
+            $this->font->getStringWidth("F", "arial", 10)
         );
 
         // string "A"
         $this->assertEquals(
             7,
-            $this->font->getStringWidth("A", "arial", "10")
+            $this->font->getStringWidth("A", "arial", 10)
         );
 
         // string "w"
         $this->assertEquals(
             8,
-            $this->font->getStringWidth("w", "arial", "10")
+            $this->font->getStringWidth("w", "arial", 10)
         );
 
         // string "G"
         $this->assertEquals(
             8,
-            $this->font->getStringWidth("G", "arial", "10")
+            $this->font->getStringWidth("G", "arial", 10)
         );
 
         // string "m"
         $this->assertEquals(
             9,
-            $this->font->getStringWidth("m", "arial", "10")
+            $this->font->getStringWidth("m", "arial", 10)
         );
 
         // string "W"
         $this->assertEquals(
             10,
-            $this->font->getStringWidth("W", "arial", "10")
+            $this->font->getStringWidth("W", "arial", 10)
         );
 
         // string "$"
         $this->assertEquals(
             3,
-            $this->font->getStringWidth("$", "arial", "10")
+            $this->font->getStringWidth("$", "arial", 10)
         );
     }
 
@@ -161,25 +163,25 @@ class FontTest extends PmaTestCase
         // string "phpMyAdmin", with Arial 10
         $this->assertEquals(
             59,
-            $this->font->getStringWidth("phpMyAdmin", "arial", "10")
+            $this->font->getStringWidth("phpMyAdmin", "arial", 10)
         );
 
         // string "phpMyAdmin", with No font
         $this->assertEquals(
             59,
-            $this->font->getStringWidth("phpMyAdmin", "", "10")
+            $this->font->getStringWidth("phpMyAdmin", "", 10)
         );
 
         // string "phpMyAdmin", with Times 10
         $this->assertEquals(
             55,
-            $this->font->getStringWidth("phpMyAdmin", "times", "10")
+            $this->font->getStringWidth("phpMyAdmin", "times", 10)
         );
 
         // string "phpMyAdmin", with Broadway 10
         $this->assertEquals(
             73,
-            $this->font->getStringWidth("phpMyAdmin", "broadway", "10")
+            $this->font->getStringWidth("phpMyAdmin", "broadway", 10)
         );
 
     }
@@ -194,25 +196,25 @@ class FontTest extends PmaTestCase
         // string "phpMyAdmin", with font size 0
         $this->assertEquals(
             0,
-            $this->font->getStringWidth("phpMyAdmin", "arial", "0")
+            $this->font->getStringWidth("phpMyAdmin", "arial", 0)
         );
 
         // string "phpMyAdmin", with Arial 10
         $this->assertEquals(
             59,
-            $this->font->getStringWidth("phpMyAdmin", "arial", "10")
+            $this->font->getStringWidth("phpMyAdmin", "arial", 10)
         );
 
         // string "phpMyAdmin", with Arial 11
         $this->assertEquals(
             65,
-            $this->font->getStringWidth("phpMyAdmin", "arial", "11")
+            $this->font->getStringWidth("phpMyAdmin", "arial", 11)
         );
 
         // string "phpMyAdmin", with Arial 20
         $this->assertEquals(
             118,
-            $this->font->getStringWidth("phpMyAdmin", "arial", "20")
+            $this->font->getStringWidth("phpMyAdmin", "arial", 20)
         );
     }
 
@@ -226,7 +228,7 @@ class FontTest extends PmaTestCase
         // string "a", with invalid charlist (= array without proper structure)
         $this->assertEquals(
             6,
-            $this->font->getStringWidth("a", "arial", "10", array("list"))
+            $this->font->getStringWidth("a", "arial", 10, array("list"))
         );
 
         // string "a", with invalid charlist (= array without proper structure :
@@ -234,7 +236,7 @@ class FontTest extends PmaTestCase
         $this->assertEquals(
             6,
             $this->font->getStringWidth(
-                "a", "arial", "10",
+                "a", "arial", 10,
                 array(array("chars" => "a"))
             )
         );
@@ -244,7 +246,7 @@ class FontTest extends PmaTestCase
         $this->assertEquals(
             6,
             $this->font->getStringWidth(
-                "a", "arial", "10",
+                "a", "arial", 10,
                 array(array("modifier" => 0.61))
             )
         );
@@ -254,7 +256,7 @@ class FontTest extends PmaTestCase
         $this->assertEquals(
             6,
             $this->font->getStringWidth(
-                "a", "arial", "10",
+                "a", "arial", 10,
                 array(array("chars" => "a", "modifier" => 0.61))
             )
         );
@@ -263,7 +265,7 @@ class FontTest extends PmaTestCase
         $this->assertEquals(
             7,
             $this->font->getStringWidth(
-                "a", "arial", "10",
+                "a", "arial", 10,
                 array(array("chars" => array("a"), "modifier" => 0.61))
             )
         );
diff --git a/test/classes/FooterTest.php b/test/classes/FooterTest.php
index 76704d9e36..2e4f0ad51a 100644
--- a/test/classes/FooterTest.php
+++ b/test/classes/FooterTest.php
@@ -4,6 +4,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests;
 
 use PhpMyAdmin\Config;
diff --git a/test/classes/Gis/GisFactoryTest.php b/test/classes/Gis/GisFactoryTest.php
index 4899b32a97..9d6bf7bf6e 100644
--- a/test/classes/Gis/GisFactoryTest.php
+++ b/test/classes/Gis/GisFactoryTest.php
@@ -5,6 +5,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests\Gis;
 
 use PhpMyAdmin\Gis\GisFactory;
diff --git a/test/classes/Gis/GisGeomTestCase.php b/test/classes/Gis/GisGeomTestCase.php
index 2addb4e1f3..df7c307d2e 100644
--- a/test/classes/Gis/GisGeomTestCase.php
+++ b/test/classes/Gis/GisGeomTestCase.php
@@ -5,6 +5,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests\Gis;
 
 use PHPUnit\Framework\TestCase;
diff --git a/test/classes/Gis/GisGeometryCollectionTest.php b/test/classes/Gis/GisGeometryCollectionTest.php
index f150d5f54a..824cc9f750 100644
--- a/test/classes/Gis/GisGeometryCollectionTest.php
+++ b/test/classes/Gis/GisGeometryCollectionTest.php
@@ -1,11 +1,12 @@
 <?php
-
 /* vim: set expandtab sw=4 ts=4 sts=4: */
 /**
  * Test for PhpMyAdmin\Gis\GisGeometry
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests\Gis;
 
 use PhpMyAdmin\Gis\GisGeometryCollection;
@@ -19,7 +20,6 @@ use TCPDF;
  */
 class GisGeometryCollectionTest extends TestCase
 {
-
     /**
      * @access protected
      */
@@ -225,7 +225,7 @@ class GisGeometryCollectionTest extends TestCase
                     'scale' => 2,
                     'height' => 150
                 ),
-                imagecreatetruecolor('120', '150')
+                imagecreatetruecolor(120, 150)
             )
         );
     }
diff --git a/test/classes/Gis/GisGeometryTest.php b/test/classes/Gis/GisGeometryTest.php
index 969090caa3..11e487646a 100644
--- a/test/classes/Gis/GisGeometryTest.php
+++ b/test/classes/Gis/GisGeometryTest.php
@@ -5,6 +5,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests\Gis;
 
 use PHPUnit\Framework\TestCase;
diff --git a/test/classes/Gis/GisLineStringTest.php b/test/classes/Gis/GisLineStringTest.php
index d438248d4e..a97a2ccc5a 100644
--- a/test/classes/Gis/GisLineStringTest.php
+++ b/test/classes/Gis/GisLineStringTest.php
@@ -5,6 +5,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests\Gis;
 
 use PhpMyAdmin\Gis\GisLineString;
@@ -206,7 +208,7 @@ class GisLineStringTest extends GisGeomTestCase
                     'scale' => 2,
                     'height' => 150
                 ),
-                imagecreatetruecolor('120', '150')
+                imagecreatetruecolor(120, 150)
             )
         );
     }
diff --git a/test/classes/Gis/GisMultiLineStringTest.php b/test/classes/Gis/GisMultiLineStringTest.php
index 9120b6bc0e..ce63dea1a6 100644
--- a/test/classes/Gis/GisMultiLineStringTest.php
+++ b/test/classes/Gis/GisMultiLineStringTest.php
@@ -5,6 +5,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests\Gis;
 
 use PhpMyAdmin\Gis\GisMultiLineString;
@@ -267,7 +269,7 @@ class GisMultiLineStringTest extends GisGeomTestCase
                     'scale' => 2,
                     'height' => 150
                 ),
-                imagecreatetruecolor('120', '150')
+                imagecreatetruecolor(120, 150)
             )
         );
     }
diff --git a/test/classes/Gis/GisMultiPointTest.php b/test/classes/Gis/GisMultiPointTest.php
index 6fd86ebab8..582107b99a 100644
--- a/test/classes/Gis/GisMultiPointTest.php
+++ b/test/classes/Gis/GisMultiPointTest.php
@@ -5,6 +5,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests\Gis;
 
 use PhpMyAdmin\Gis\GisMultiPoint;
@@ -210,7 +212,7 @@ class GisMultiPointTest extends GisGeomTestCase
                     'scale' => 2,
                     'height' => 150
                 ),
-                imagecreatetruecolor('120', '150'),
+                imagecreatetruecolor(120, 150),
             )
         );
     }
diff --git a/test/classes/Gis/GisMultiPolygonTest.php b/test/classes/Gis/GisMultiPolygonTest.php
index cf50ad8581..9de3defe33 100644
--- a/test/classes/Gis/GisMultiPolygonTest.php
+++ b/test/classes/Gis/GisMultiPolygonTest.php
@@ -5,6 +5,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests\Gis;
 
 use PhpMyAdmin\Gis\GisMultiPolygon;
@@ -311,7 +313,7 @@ class GisMultiPolygonTest extends GisGeomTestCase
                     'scale' => 2,
                     'height' => 150
                 ),
-                imagecreatetruecolor('120', '150'),
+                imagecreatetruecolor(120, 150),
             )
 
         );
diff --git a/test/classes/Gis/GisPointTest.php b/test/classes/Gis/GisPointTest.php
index c2f71cb8ad..17155aac39 100644
--- a/test/classes/Gis/GisPointTest.php
+++ b/test/classes/Gis/GisPointTest.php
@@ -5,6 +5,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests\Gis;
 
 use PhpMyAdmin\Gis\GisPoint;
@@ -211,7 +213,7 @@ class GisPointTest extends GisGeomTestCase
                     'scale' => 2,
                     'height' => 150
                 ),
-                imagecreatetruecolor('120', '150')
+                imagecreatetruecolor(120, 150)
             )
         );
     }
diff --git a/test/classes/Gis/GisPolygonTest.php b/test/classes/Gis/GisPolygonTest.php
index 5dc0921f0c..4645f75bd1 100644
--- a/test/classes/Gis/GisPolygonTest.php
+++ b/test/classes/Gis/GisPolygonTest.php
@@ -5,6 +5,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests\Gis;
 
 use PhpMyAdmin\Gis\GisPolygon;
@@ -398,7 +400,7 @@ class GisPolygonTest extends GisGeomTestCase
                     'scale' => 2,
                     'height' => 150
                 ),
-                imagecreatetruecolor('120', '150')
+                imagecreatetruecolor(120, 150)
             )
         );
     }
diff --git a/test/classes/HeaderTest.php b/test/classes/HeaderTest.php
index 98f8e97299..229e48ed83 100644
--- a/test/classes/HeaderTest.php
+++ b/test/classes/HeaderTest.php
@@ -5,6 +5,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests;
 
 use PhpMyAdmin\Config;
diff --git a/test/classes/ImportTest.php b/test/classes/ImportTest.php
index d006a6d001..10d3090e89 100644
--- a/test/classes/ImportTest.php
+++ b/test/classes/ImportTest.php
@@ -5,6 +5,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests;
 
 use PhpMyAdmin\Import;
diff --git a/test/classes/IndexTest.php b/test/classes/IndexTest.php
index 3d6dd19094..139455dc80 100644
--- a/test/classes/IndexTest.php
+++ b/test/classes/IndexTest.php
@@ -5,6 +5,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests;
 
 use PhpMyAdmin\Index;
diff --git a/test/classes/InsertEditTest.php b/test/classes/InsertEditTest.php
index 0b30a49652..2f40cbd79e 100644
--- a/test/classes/InsertEditTest.php
+++ b/test/classes/InsertEditTest.php
@@ -5,6 +5,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests;
 
 use PhpMyAdmin\Config;
diff --git a/test/classes/IpAllowDenyTest.php b/test/classes/IpAllowDenyTest.php
index d7d0e6d2a1..f7c89b66cd 100644
--- a/test/classes/IpAllowDenyTest.php
+++ b/test/classes/IpAllowDenyTest.php
@@ -5,6 +5,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests;
 
 use PhpMyAdmin\Core;
diff --git a/test/classes/LanguageTest.php b/test/classes/LanguageTest.php
index edf952ec66..efe73e378c 100644
--- a/test/classes/LanguageTest.php
+++ b/test/classes/LanguageTest.php
@@ -5,6 +5,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests;
 
 use PhpMyAdmin\LanguageManager;
diff --git a/test/classes/LinterTest.php b/test/classes/LinterTest.php
index 0dd70e8ff6..e8a4fcf5ef 100644
--- a/test/classes/LinterTest.php
+++ b/test/classes/LinterTest.php
@@ -5,6 +5,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests;
 
 use PhpMyAdmin\Linter;
diff --git a/test/classes/ListDatabaseTest.php b/test/classes/ListDatabaseTest.php
index 51920b595c..42c7cfc964 100644
--- a/test/classes/ListDatabaseTest.php
+++ b/test/classes/ListDatabaseTest.php
@@ -5,6 +5,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests;
 
 use PhpMyAdmin\ListDatabase;
diff --git a/test/classes/MenuTest.php b/test/classes/MenuTest.php
index 6cdee18208..87d7254c30 100644
--- a/test/classes/MenuTest.php
+++ b/test/classes/MenuTest.php
@@ -5,6 +5,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests;
 
 use PhpMyAdmin\Core;
diff --git a/test/classes/MessageTest.php b/test/classes/MessageTest.php
index 519bbf26fc..b557cdb3bb 100644
--- a/test/classes/MessageTest.php
+++ b/test/classes/MessageTest.php
@@ -5,6 +5,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests;
 
 use PhpMyAdmin\Message;
diff --git a/test/classes/MimeTest.php b/test/classes/MimeTest.php
index f26d72657b..861203615e 100644
--- a/test/classes/MimeTest.php
+++ b/test/classes/MimeTest.php
@@ -5,6 +5,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests;
 
 use PhpMyAdmin\Mime;
diff --git a/test/classes/MultSubmitsTest.php b/test/classes/MultSubmitsTest.php
index 16636c1428..9dcf19d4c3 100644
--- a/test/classes/MultSubmitsTest.php
+++ b/test/classes/MultSubmitsTest.php
@@ -5,6 +5,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests;
 
 use PhpMyAdmin\MultSubmits;
diff --git a/test/classes/Navigation/NavigationTest.php b/test/classes/Navigation/NavigationTest.php
index e83bfb09dd..a0ac1f028d 100644
--- a/test/classes/Navigation/NavigationTest.php
+++ b/test/classes/Navigation/NavigationTest.php
@@ -5,6 +5,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests\Navigation;
 
 use PhpMyAdmin\Navigation\Navigation;
diff --git a/test/classes/Navigation/NavigationTreeTest.php b/test/classes/Navigation/NavigationTreeTest.php
index 0149332035..f5e31c3a29 100644
--- a/test/classes/Navigation/NavigationTreeTest.php
+++ b/test/classes/Navigation/NavigationTreeTest.php
@@ -5,6 +5,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests\Navigation;
 
 use PhpMyAdmin\Config;
diff --git a/test/classes/Navigation/NodeFactoryTest.php b/test/classes/Navigation/NodeFactoryTest.php
index 5129ea00b8..6ec8c0a4ae 100644
--- a/test/classes/Navigation/NodeFactoryTest.php
+++ b/test/classes/Navigation/NodeFactoryTest.php
@@ -5,6 +5,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests\Navigation;
 
 use PhpMyAdmin\Navigation\NodeFactory;
diff --git a/test/classes/Navigation/Nodes/NodeColumnContainerTest.php b/test/classes/Navigation/Nodes/NodeColumnContainerTest.php
index 94ea54988b..164c6f864f 100644
--- a/test/classes/Navigation/Nodes/NodeColumnContainerTest.php
+++ b/test/classes/Navigation/Nodes/NodeColumnContainerTest.php
@@ -5,6 +5,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests\Navigation\Nodes;
 
 use PhpMyAdmin\Navigation\NodeFactory;
diff --git a/test/classes/Navigation/Nodes/NodeColumnTest.php b/test/classes/Navigation/Nodes/NodeColumnTest.php
index 96eec958ed..63090e9a7d 100644
--- a/test/classes/Navigation/Nodes/NodeColumnTest.php
+++ b/test/classes/Navigation/Nodes/NodeColumnTest.php
@@ -5,6 +5,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests\Navigation\Nodes;
 
 use PhpMyAdmin\Navigation\NodeFactory;
diff --git a/test/classes/Navigation/Nodes/NodeDatabaseChildTest.php b/test/classes/Navigation/Nodes/NodeDatabaseChildTest.php
index 667ba9e527..5123bf9264 100644
--- a/test/classes/Navigation/Nodes/NodeDatabaseChildTest.php
+++ b/test/classes/Navigation/Nodes/NodeDatabaseChildTest.php
@@ -5,6 +5,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests\Navigation\Nodes;
 
 use PhpMyAdmin\Navigation\NodeFactory;
diff --git a/test/classes/Navigation/Nodes/NodeDatabaseTest.php b/test/classes/Navigation/Nodes/NodeDatabaseTest.php
index 6bd2c945c7..da3c158808 100644
--- a/test/classes/Navigation/Nodes/NodeDatabaseTest.php
+++ b/test/classes/Navigation/Nodes/NodeDatabaseTest.php
@@ -5,6 +5,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests\Navigation\Nodes;
 
 use PhpMyAdmin\Navigation\NodeFactory;
diff --git a/test/classes/Navigation/Nodes/NodeEventContainerTest.php b/test/classes/Navigation/Nodes/NodeEventContainerTest.php
index 7651954bba..70b487da39 100644
--- a/test/classes/Navigation/Nodes/NodeEventContainerTest.php
+++ b/test/classes/Navigation/Nodes/NodeEventContainerTest.php
@@ -5,6 +5,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests\Navigation\Nodes;
 
 use PhpMyAdmin\Navigation\NodeFactory;
diff --git a/test/classes/Navigation/Nodes/NodeEventTest.php b/test/classes/Navigation/Nodes/NodeEventTest.php
index c88962268a..2207bd7d6b 100644
--- a/test/classes/Navigation/Nodes/NodeEventTest.php
+++ b/test/classes/Navigation/Nodes/NodeEventTest.php
@@ -5,6 +5,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests\Navigation\Nodes;
 
 use PhpMyAdmin\Navigation\NodeFactory;
diff --git a/test/classes/Navigation/Nodes/NodeFunctionContainerTest.php b/test/classes/Navigation/Nodes/NodeFunctionContainerTest.php
index 703902b341..64815094e6 100644
--- a/test/classes/Navigation/Nodes/NodeFunctionContainerTest.php
+++ b/test/classes/Navigation/Nodes/NodeFunctionContainerTest.php
@@ -5,6 +5,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests\Navigation\Nodes;
 
 use PhpMyAdmin\Navigation\NodeFactory;
diff --git a/test/classes/Navigation/Nodes/NodeFunctionTest.php b/test/classes/Navigation/Nodes/NodeFunctionTest.php
index 8b8ea4a1f6..a43933d87a 100644
--- a/test/classes/Navigation/Nodes/NodeFunctionTest.php
+++ b/test/classes/Navigation/Nodes/NodeFunctionTest.php
@@ -5,6 +5,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests\Navigation\Nodes;
 
 use PhpMyAdmin\Navigation\NodeFactory;
diff --git a/test/classes/Navigation/Nodes/NodeIndexContainerTest.php b/test/classes/Navigation/Nodes/NodeIndexContainerTest.php
index c83d131cea..c92a28fbb9 100644
--- a/test/classes/Navigation/Nodes/NodeIndexContainerTest.php
+++ b/test/classes/Navigation/Nodes/NodeIndexContainerTest.php
@@ -5,6 +5,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests\Navigation\Nodes;
 
 use PhpMyAdmin\Navigation\NodeFactory;
diff --git a/test/classes/Navigation/Nodes/NodeIndexTest.php b/test/classes/Navigation/Nodes/NodeIndexTest.php
index 38ee6f6b63..c152b42800 100644
--- a/test/classes/Navigation/Nodes/NodeIndexTest.php
+++ b/test/classes/Navigation/Nodes/NodeIndexTest.php
@@ -5,6 +5,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests\Navigation\Nodes;
 
 use PhpMyAdmin\Navigation\NodeFactory;
diff --git a/test/classes/Navigation/Nodes/NodeProcedureContainerTest.php b/test/classes/Navigation/Nodes/NodeProcedureContainerTest.php
index 8420053f0e..eaf465911a 100644
--- a/test/classes/Navigation/Nodes/NodeProcedureContainerTest.php
+++ b/test/classes/Navigation/Nodes/NodeProcedureContainerTest.php
@@ -5,6 +5,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests\Navigation\Nodes;
 
 use PhpMyAdmin\Navigation\NodeFactory;
diff --git a/test/classes/Navigation/Nodes/NodeProcedureTest.php b/test/classes/Navigation/Nodes/NodeProcedureTest.php
index a964ace9c4..e798a1e67b 100644
--- a/test/classes/Navigation/Nodes/NodeProcedureTest.php
+++ b/test/classes/Navigation/Nodes/NodeProcedureTest.php
@@ -5,6 +5,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests\Navigation\Nodes;
 
 use PhpMyAdmin\Navigation\NodeFactory;
diff --git a/test/classes/Navigation/Nodes/NodeTableContainerTest.php b/test/classes/Navigation/Nodes/NodeTableContainerTest.php
index 41e9edf2d9..e8bd5ee922 100644
--- a/test/classes/Navigation/Nodes/NodeTableContainerTest.php
+++ b/test/classes/Navigation/Nodes/NodeTableContainerTest.php
@@ -5,6 +5,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests\Navigation\Nodes;
 
 use PhpMyAdmin\Navigation\NodeFactory;
diff --git a/test/classes/Navigation/Nodes/NodeTableTest.php b/test/classes/Navigation/Nodes/NodeTableTest.php
index 6e2fd21ceb..c695797679 100644
--- a/test/classes/Navigation/Nodes/NodeTableTest.php
+++ b/test/classes/Navigation/Nodes/NodeTableTest.php
@@ -5,6 +5,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests\Navigation\Nodes;
 
 use PhpMyAdmin\Navigation\NodeFactory;
diff --git a/test/classes/Navigation/Nodes/NodeTest.php b/test/classes/Navigation/Nodes/NodeTest.php
index 4ee258b134..d1abfdbc89 100644
--- a/test/classes/Navigation/Nodes/NodeTest.php
+++ b/test/classes/Navigation/Nodes/NodeTest.php
@@ -5,6 +5,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests\Navigation\Nodes;
 
 use PhpMyAdmin\Navigation\NodeFactory;
diff --git a/test/classes/Navigation/Nodes/NodeTriggerContainerTest.php b/test/classes/Navigation/Nodes/NodeTriggerContainerTest.php
index 1ef6784e54..dabd8fdd60 100644
--- a/test/classes/Navigation/Nodes/NodeTriggerContainerTest.php
+++ b/test/classes/Navigation/Nodes/NodeTriggerContainerTest.php
@@ -5,6 +5,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests\Navigation\Nodes;
 
 use PhpMyAdmin\Navigation\NodeFactory;
diff --git a/test/classes/Navigation/Nodes/NodeTriggerTest.php b/test/classes/Navigation/Nodes/NodeTriggerTest.php
index 68f7f7106e..7a8d5acf5b 100644
--- a/test/classes/Navigation/Nodes/NodeTriggerTest.php
+++ b/test/classes/Navigation/Nodes/NodeTriggerTest.php
@@ -5,6 +5,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests\Navigation\Nodes;
 
 use PhpMyAdmin\Navigation\NodeFactory;
diff --git a/test/classes/Navigation/Nodes/NodeViewContainerTest.php b/test/classes/Navigation/Nodes/NodeViewContainerTest.php
index f9dbf28754..d42a973307 100644
--- a/test/classes/Navigation/Nodes/NodeViewContainerTest.php
+++ b/test/classes/Navigation/Nodes/NodeViewContainerTest.php
@@ -5,6 +5,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests\Navigation\Nodes;
 
 use PhpMyAdmin\Navigation\NodeFactory;
diff --git a/test/classes/Navigation/Nodes/NodeViewTest.php b/test/classes/Navigation/Nodes/NodeViewTest.php
index f1c50e8452..598b81f6f3 100644
--- a/test/classes/Navigation/Nodes/NodeViewTest.php
+++ b/test/classes/Navigation/Nodes/NodeViewTest.php
@@ -5,6 +5,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests\Navigation\Nodes;
 
 use PhpMyAdmin\Navigation\NodeFactory;
diff --git a/test/classes/NormalizationTest.php b/test/classes/NormalizationTest.php
index f9bf1996c3..17c3b862e7 100644
--- a/test/classes/NormalizationTest.php
+++ b/test/classes/NormalizationTest.php
@@ -5,6 +5,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests;
 
 use PhpMyAdmin\DatabaseInterface;
diff --git a/test/classes/OperationsTest.php b/test/classes/OperationsTest.php
index cd425f37cd..7ed729c83e 100644
--- a/test/classes/OperationsTest.php
+++ b/test/classes/OperationsTest.php
@@ -5,6 +5,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests;
 
 use PhpMyAdmin\Operations;
diff --git a/test/classes/PdfTest.php b/test/classes/PdfTest.php
index 0f8942d220..17e8d6139a 100644
--- a/test/classes/PdfTest.php
+++ b/test/classes/PdfTest.php
@@ -5,6 +5,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests;
 
 use PhpMyAdmin\Config;
diff --git a/test/classes/Plugins/Auth/AuthenticationConfigTest.php b/test/classes/Plugins/Auth/AuthenticationConfigTest.php
index 7ac788c782..95dd00525a 100644
--- a/test/classes/Plugins/Auth/AuthenticationConfigTest.php
+++ b/test/classes/Plugins/Auth/AuthenticationConfigTest.php
@@ -5,6 +5,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests\Plugins\Auth;
 
 use PhpMyAdmin\Config;
diff --git a/test/classes/Plugins/Auth/AuthenticationCookieTest.php b/test/classes/Plugins/Auth/AuthenticationCookieTest.php
index 48f18966ed..2a60dbca19 100644
--- a/test/classes/Plugins/Auth/AuthenticationCookieTest.php
+++ b/test/classes/Plugins/Auth/AuthenticationCookieTest.php
@@ -5,6 +5,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests\Plugins\Auth;
 
 use PhpMyAdmin\Config;
diff --git a/test/classes/Plugins/Auth/AuthenticationHttpTest.php b/test/classes/Plugins/Auth/AuthenticationHttpTest.php
index ac72bd292e..aaa1d5f499 100644
--- a/test/classes/Plugins/Auth/AuthenticationHttpTest.php
+++ b/test/classes/Plugins/Auth/AuthenticationHttpTest.php
@@ -5,6 +5,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests\Plugins\Auth;
 
 use PhpMyAdmin\Config;
diff --git a/test/classes/Plugins/Auth/AuthenticationSignonTest.php b/test/classes/Plugins/Auth/AuthenticationSignonTest.php
index 262dd2301e..3ff893d201 100644
--- a/test/classes/Plugins/Auth/AuthenticationSignonTest.php
+++ b/test/classes/Plugins/Auth/AuthenticationSignonTest.php
@@ -5,6 +5,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests\Plugins\Auth;
 
 use PhpMyAdmin\Config;
diff --git a/test/classes/Plugins/Export/ExportCodegenTest.php b/test/classes/Plugins/Export/ExportCodegenTest.php
index 58e05153ed..b807ca2902 100644
--- a/test/classes/Plugins/Export/ExportCodegenTest.php
+++ b/test/classes/Plugins/Export/ExportCodegenTest.php
@@ -5,6 +5,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests\Plugins\Export;
 
 use PhpMyAdmin\Plugins\Export\ExportCodegen;
diff --git a/test/classes/Plugins/Export/ExportCsvTest.php b/test/classes/Plugins/Export/ExportCsvTest.php
index 0e17f1280c..8304e89021 100644
--- a/test/classes/Plugins/Export/ExportCsvTest.php
+++ b/test/classes/Plugins/Export/ExportCsvTest.php
@@ -5,6 +5,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests\Plugins\Export;
 
 use PhpMyAdmin\DatabaseInterface;
diff --git a/test/classes/Plugins/Export/ExportExcelTest.php b/test/classes/Plugins/Export/ExportExcelTest.php
index 3f771bb177..2257b28a71 100644
--- a/test/classes/Plugins/Export/ExportExcelTest.php
+++ b/test/classes/Plugins/Export/ExportExcelTest.php
@@ -5,6 +5,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests\Plugins\Export;
 
 use PhpMyAdmin\Plugins\Export\ExportExcel;
diff --git a/test/classes/Plugins/Export/ExportHtmlwordTest.php b/test/classes/Plugins/Export/ExportHtmlwordTest.php
index afdd40c043..8ef0c81eed 100644
--- a/test/classes/Plugins/Export/ExportHtmlwordTest.php
+++ b/test/classes/Plugins/Export/ExportHtmlwordTest.php
@@ -5,6 +5,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests\Plugins\Export;
 
 use PhpMyAdmin\DatabaseInterface;
diff --git a/test/classes/Plugins/Export/ExportJsonTest.php b/test/classes/Plugins/Export/ExportJsonTest.php
index 50ead4d27b..460cf75a1c 100644
--- a/test/classes/Plugins/Export/ExportJsonTest.php
+++ b/test/classes/Plugins/Export/ExportJsonTest.php
@@ -5,6 +5,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests\Plugins\Export;
 
 use PhpMyAdmin\Plugins\Export\ExportJson;
diff --git a/test/classes/Plugins/Export/ExportLatexTest.php b/test/classes/Plugins/Export/ExportLatexTest.php
index ba6649fa84..5ef6ddf8e8 100644
--- a/test/classes/Plugins/Export/ExportLatexTest.php
+++ b/test/classes/Plugins/Export/ExportLatexTest.php
@@ -5,6 +5,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests\Plugins\Export;
 
 use PhpMyAdmin\Plugins\Export\ExportLatex;
diff --git a/test/classes/Plugins/Export/ExportMediawikiTest.php b/test/classes/Plugins/Export/ExportMediawikiTest.php
index 31f1747acf..11a0f24200 100644
--- a/test/classes/Plugins/Export/ExportMediawikiTest.php
+++ b/test/classes/Plugins/Export/ExportMediawikiTest.php
@@ -5,6 +5,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests\Plugins\Export;
 
 use PhpMyAdmin\DatabaseInterface;
diff --git a/test/classes/Plugins/Export/ExportOdsTest.php b/test/classes/Plugins/Export/ExportOdsTest.php
index fcd27d5738..6885180d81 100644
--- a/test/classes/Plugins/Export/ExportOdsTest.php
+++ b/test/classes/Plugins/Export/ExportOdsTest.php
@@ -5,6 +5,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests\Plugins\Export;
 
 use PhpMyAdmin\DatabaseInterface;
diff --git a/test/classes/Plugins/Export/ExportOdtTest.php b/test/classes/Plugins/Export/ExportOdtTest.php
index fbe1f3dfc8..6fd5c0cae9 100644
--- a/test/classes/Plugins/Export/ExportOdtTest.php
+++ b/test/classes/Plugins/Export/ExportOdtTest.php
@@ -5,6 +5,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests\Plugins\Export;
 
 use PhpMyAdmin\DatabaseInterface;
diff --git a/test/classes/Plugins/Export/ExportPdfTest.php b/test/classes/Plugins/Export/ExportPdfTest.php
index 0a2e13baeb..b9ba1de3fe 100644
--- a/test/classes/Plugins/Export/ExportPdfTest.php
+++ b/test/classes/Plugins/Export/ExportPdfTest.php
@@ -5,6 +5,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests\Plugins\Export;
 
 use PhpMyAdmin\Plugins\Export\ExportPdf;
diff --git a/test/classes/Plugins/Export/ExportPhparrayTest.php b/test/classes/Plugins/Export/ExportPhparrayTest.php
index d326d71fee..9bbb963a3d 100644
--- a/test/classes/Plugins/Export/ExportPhparrayTest.php
+++ b/test/classes/Plugins/Export/ExportPhparrayTest.php
@@ -5,6 +5,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests\Plugins\Export;
 
 use PhpMyAdmin\DatabaseInterface;
diff --git a/test/classes/Plugins/Export/ExportSqlTest.php b/test/classes/Plugins/Export/ExportSqlTest.php
index 2a6ee2d6fc..bda8104de0 100644
--- a/test/classes/Plugins/Export/ExportSqlTest.php
+++ b/test/classes/Plugins/Export/ExportSqlTest.php
@@ -5,6 +5,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests\Plugins\Export;
 
 use PhpMyAdmin\DatabaseInterface;
diff --git a/test/classes/Plugins/Export/ExportTexytextTest.php b/test/classes/Plugins/Export/ExportTexytextTest.php
index d6a9bb7d67..4b6e1c3c80 100644
--- a/test/classes/Plugins/Export/ExportTexytextTest.php
+++ b/test/classes/Plugins/Export/ExportTexytextTest.php
@@ -5,6 +5,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests\Plugins\Export;
 
 use PhpMyAdmin\DatabaseInterface;
diff --git a/test/classes/Plugins/Export/ExportXmlTest.php b/test/classes/Plugins/Export/ExportXmlTest.php
index 45f783eb64..1e409a3d4b 100644
--- a/test/classes/Plugins/Export/ExportXmlTest.php
+++ b/test/classes/Plugins/Export/ExportXmlTest.php
@@ -5,6 +5,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests\Plugins\Export;
 
 use PhpMyAdmin\DatabaseInterface;
diff --git a/test/classes/Plugins/Export/ExportYamlTest.php b/test/classes/Plugins/Export/ExportYamlTest.php
index 3c70d2189c..fd6cf28f99 100644
--- a/test/classes/Plugins/Export/ExportYamlTest.php
+++ b/test/classes/Plugins/Export/ExportYamlTest.php
@@ -5,6 +5,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests\Plugins\Export;
 
 use PhpMyAdmin\DatabaseInterface;
diff --git a/test/classes/Plugins/Export/Helpers/TablePropertyTest.php b/test/classes/Plugins/Export/Helpers/TablePropertyTest.php
index c8c53e51e5..5aa0f8bea9 100644
--- a/test/classes/Plugins/Export/Helpers/TablePropertyTest.php
+++ b/test/classes/Plugins/Export/Helpers/TablePropertyTest.php
@@ -5,6 +5,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests\Plugins\Export\Helpers;
 
 use PhpMyAdmin\Plugins\Export\Helpers\TableProperty;
diff --git a/test/classes/Plugins/Import/ImportCsvTest.php b/test/classes/Plugins/Import/ImportCsvTest.php
index f74f4ae513..45c7a7ee67 100644
--- a/test/classes/Plugins/Import/ImportCsvTest.php
+++ b/test/classes/Plugins/Import/ImportCsvTest.php
@@ -4,6 +4,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests\Plugins\Import;
 
 use PhpMyAdmin\File;
diff --git a/test/classes/Plugins/Import/ImportLdiTest.php b/test/classes/Plugins/Import/ImportLdiTest.php
index cbd8721505..a4075c8cfc 100644
--- a/test/classes/Plugins/Import/ImportLdiTest.php
+++ b/test/classes/Plugins/Import/ImportLdiTest.php
@@ -4,6 +4,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests\Plugins\Import;
 
 use PhpMyAdmin\File;
diff --git a/test/classes/Plugins/Import/ImportMediawikiTest.php b/test/classes/Plugins/Import/ImportMediawikiTest.php
index 265a149672..490a525532 100644
--- a/test/classes/Plugins/Import/ImportMediawikiTest.php
+++ b/test/classes/Plugins/Import/ImportMediawikiTest.php
@@ -4,6 +4,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests\Plugins\Import;
 
 use PhpMyAdmin\File;
diff --git a/test/classes/Plugins/Import/ImportOdsTest.php b/test/classes/Plugins/Import/ImportOdsTest.php
index 40cabebbfb..a2969182b0 100644
--- a/test/classes/Plugins/Import/ImportOdsTest.php
+++ b/test/classes/Plugins/Import/ImportOdsTest.php
@@ -4,6 +4,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests\Plugins\Import;
 
 use PhpMyAdmin\File;
diff --git a/test/classes/Plugins/Import/ImportShpTest.php b/test/classes/Plugins/Import/ImportShpTest.php
index 02be7e7291..6bd6c9dd49 100644
--- a/test/classes/Plugins/Import/ImportShpTest.php
+++ b/test/classes/Plugins/Import/ImportShpTest.php
@@ -4,6 +4,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests\Plugins\Import;
 
 use PhpMyAdmin\File;
diff --git a/test/classes/Plugins/Import/ImportSqlTest.php b/test/classes/Plugins/Import/ImportSqlTest.php
index 57228eb492..5a2672a1e7 100644
--- a/test/classes/Plugins/Import/ImportSqlTest.php
+++ b/test/classes/Plugins/Import/ImportSqlTest.php
@@ -4,6 +4,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests\Plugins\Import;
 
 use PhpMyAdmin\File;
diff --git a/test/classes/Plugins/Import/ImportXmlTest.php b/test/classes/Plugins/Import/ImportXmlTest.php
index 8abdfbdc07..4c01d33428 100644
--- a/test/classes/Plugins/Import/ImportXmlTest.php
+++ b/test/classes/Plugins/Import/ImportXmlTest.php
@@ -4,6 +4,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests\Plugins\Import;
 
 use PhpMyAdmin\File;
diff --git a/test/classes/Plugins/Schema/DiaRelationSchemaTest.php b/test/classes/Plugins/Schema/DiaRelationSchemaTest.php
index 5c08609280..3909e44b35 100644
--- a/test/classes/Plugins/Schema/DiaRelationSchemaTest.php
+++ b/test/classes/Plugins/Schema/DiaRelationSchemaTest.php
@@ -4,6 +4,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests\Plugins\Schema;
 
 use PhpMyAdmin\Plugins\Schema\Dia\DiaRelationSchema;
diff --git a/test/classes/Plugins/Schema/EpsRelationSchemaTest.php b/test/classes/Plugins/Schema/EpsRelationSchemaTest.php
index b9aea56d85..0dc56cb2d5 100644
--- a/test/classes/Plugins/Schema/EpsRelationSchemaTest.php
+++ b/test/classes/Plugins/Schema/EpsRelationSchemaTest.php
@@ -4,6 +4,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests\Plugins\Schema;
 
 use PhpMyAdmin\Plugins\Schema\Eps\EpsRelationSchema;
diff --git a/test/classes/Plugins/Schema/ExportRelationSchemaTest.php b/test/classes/Plugins/Schema/ExportRelationSchemaTest.php
index f1509e9191..afdb2bef59 100644
--- a/test/classes/Plugins/Schema/ExportRelationSchemaTest.php
+++ b/test/classes/Plugins/Schema/ExportRelationSchemaTest.php
@@ -4,6 +4,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests\Plugins\Schema;
 
 use PhpMyAdmin\Plugins\Schema\ExportRelationSchema;
diff --git a/test/classes/Plugins/Schema/PdfRelationSchemaTest.php b/test/classes/Plugins/Schema/PdfRelationSchemaTest.php
index 65bcf901d2..e9238d7c07 100644
--- a/test/classes/Plugins/Schema/PdfRelationSchemaTest.php
+++ b/test/classes/Plugins/Schema/PdfRelationSchemaTest.php
@@ -4,6 +4,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests\Plugins\Schema;
 
 use PhpMyAdmin\Plugins\Schema\Pdf\PdfRelationSchema;
diff --git a/test/classes/Plugins/Schema/SvgRelationSchemaTest.php b/test/classes/Plugins/Schema/SvgRelationSchemaTest.php
index 11dc2256e9..b83897241f 100644
--- a/test/classes/Plugins/Schema/SvgRelationSchemaTest.php
+++ b/test/classes/Plugins/Schema/SvgRelationSchemaTest.php
@@ -4,6 +4,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests\Plugins\Schema;
 
 use PhpMyAdmin\Plugins\Schema\Svg\SvgRelationSchema;
diff --git a/test/classes/Plugins/Transformations/TransformationPluginsTest.php b/test/classes/Plugins/Transformations/TransformationPluginsTest.php
index 609c908d20..db74f226dd 100644
--- a/test/classes/Plugins/Transformations/TransformationPluginsTest.php
+++ b/test/classes/Plugins/Transformations/TransformationPluginsTest.php
@@ -4,6 +4,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests\Plugins\Transformations;
 
 use PhpMyAdmin\Config;
diff --git a/test/classes/PmaTestCase.php b/test/classes/PmaTestCase.php
index 3a645ef44b..d226027a2a 100644
--- a/test/classes/PmaTestCase.php
+++ b/test/classes/PmaTestCase.php
@@ -5,6 +5,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests;
 
 use PhpMyAdmin\Response;
diff --git a/test/classes/Properties/Options/Groups/OptionsPropertyMainGroupTest.php b/test/classes/Properties/Options/Groups/OptionsPropertyMainGroupTest.php
index e1f6e01433..1bf33b3c62 100644
--- a/test/classes/Properties/Options/Groups/OptionsPropertyMainGroupTest.php
+++ b/test/classes/Properties/Options/Groups/OptionsPropertyMainGroupTest.php
@@ -5,6 +5,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests\Properties\Options\Groups;
 
 use PhpMyAdmin\Properties\Options\Groups\OptionsPropertyMainGroup;
diff --git a/test/classes/Properties/Options/Groups/OptionsPropertyRootGroupTest.php b/test/classes/Properties/Options/Groups/OptionsPropertyRootGroupTest.php
index b6f85e2b79..963aefa35a 100644
--- a/test/classes/Properties/Options/Groups/OptionsPropertyRootGroupTest.php
+++ b/test/classes/Properties/Options/Groups/OptionsPropertyRootGroupTest.php
@@ -5,6 +5,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests\Properties\Options\Groups;
 
 use PhpMyAdmin\Properties\Options\Groups\OptionsPropertyRootGroup;
diff --git a/test/classes/Properties/Options/Groups/OptionsPropertySubgroupTest.php b/test/classes/Properties/Options/Groups/OptionsPropertySubgroupTest.php
index 7e86a63c2b..93de24e06a 100644
--- a/test/classes/Properties/Options/Groups/OptionsPropertySubgroupTest.php
+++ b/test/classes/Properties/Options/Groups/OptionsPropertySubgroupTest.php
@@ -5,6 +5,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests\Properties\Options\Groups;
 
 use PhpMyAdmin\Properties\Options\Groups\OptionsPropertySubgroup;
diff --git a/test/classes/Properties/Options/Items/PropertyItemsTest.php b/test/classes/Properties/Options/Items/PropertyItemsTest.php
index 64da38d374..78fc728025 100644
--- a/test/classes/Properties/Options/Items/PropertyItemsTest.php
+++ b/test/classes/Properties/Options/Items/PropertyItemsTest.php
@@ -5,6 +5,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests\Properties\Options\Items;
 
 use PhpMyAdmin\Properties\Options\Items\BoolPropertyItem;
diff --git a/test/classes/Properties/Options/OptionsPropertyGroupTest.php b/test/classes/Properties/Options/OptionsPropertyGroupTest.php
index 2f7adb1c68..e76d995ef5 100644
--- a/test/classes/Properties/Options/OptionsPropertyGroupTest.php
+++ b/test/classes/Properties/Options/OptionsPropertyGroupTest.php
@@ -5,6 +5,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests\Properties\Options;
 
 use PHPUnit\Framework\TestCase;
diff --git a/test/classes/Properties/Options/OptionsPropertyItemTest.php b/test/classes/Properties/Options/OptionsPropertyItemTest.php
index 265a2308fa..26349d0f03 100644
--- a/test/classes/Properties/Options/OptionsPropertyItemTest.php
+++ b/test/classes/Properties/Options/OptionsPropertyItemTest.php
@@ -5,6 +5,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests\Properties\Options;
 
 use PHPUnit\Framework\TestCase;
diff --git a/test/classes/Properties/Options/OptionsPropertyOneItemTest.php b/test/classes/Properties/Options/OptionsPropertyOneItemTest.php
index 1dc8d000e5..fc83262eb7 100644
--- a/test/classes/Properties/Options/OptionsPropertyOneItemTest.php
+++ b/test/classes/Properties/Options/OptionsPropertyOneItemTest.php
@@ -5,6 +5,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests\Properties\Options;
 
 use PHPUnit\Framework\TestCase;
diff --git a/test/classes/Properties/Plugins/ExportPluginPropertiesTest.php b/test/classes/Properties/Plugins/ExportPluginPropertiesTest.php
index d3a1610b61..5039ce3005 100644
--- a/test/classes/Properties/Plugins/ExportPluginPropertiesTest.php
+++ b/test/classes/Properties/Plugins/ExportPluginPropertiesTest.php
@@ -5,6 +5,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests\Properties\Plugins;
 
 use PhpMyAdmin\Properties\Plugins\ExportPluginProperties;
diff --git a/test/classes/Properties/Plugins/ImportPluginPropertiesTest.php b/test/classes/Properties/Plugins/ImportPluginPropertiesTest.php
index 934721880f..b21a4fd1fc 100644
--- a/test/classes/Properties/Plugins/ImportPluginPropertiesTest.php
+++ b/test/classes/Properties/Plugins/ImportPluginPropertiesTest.php
@@ -5,6 +5,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests\Properties\Plugins;
 
 use PhpMyAdmin\Properties\Plugins\ImportPluginProperties;
diff --git a/test/classes/Properties/Plugins/PluginPropertyItemTest.php b/test/classes/Properties/Plugins/PluginPropertyItemTest.php
index 8a27540024..959f826bd7 100644
--- a/test/classes/Properties/Plugins/PluginPropertyItemTest.php
+++ b/test/classes/Properties/Plugins/PluginPropertyItemTest.php
@@ -5,6 +5,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests\Properties\Plugins;
 
 use PHPUnit\Framework\TestCase;
diff --git a/test/classes/Properties/PropertyItemTest.php b/test/classes/Properties/PropertyItemTest.php
index 564506f41e..4660955176 100644
--- a/test/classes/Properties/PropertyItemTest.php
+++ b/test/classes/Properties/PropertyItemTest.php
@@ -5,6 +5,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests\Properties;
 
 use PHPUnit\Framework\TestCase;
diff --git a/test/classes/RelationCleanupDbiMock.php b/test/classes/RelationCleanupDbiMock.php
index 164e43b5b9..ddeaa16ba3 100644
--- a/test/classes/RelationCleanupDbiMock.php
+++ b/test/classes/RelationCleanupDbiMock.php
@@ -5,6 +5,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests;
 
 use PhpMyAdmin\DatabaseInterface;
diff --git a/test/classes/RelationCleanupTest.php b/test/classes/RelationCleanupTest.php
index 1e2160a497..c744ef0919 100644
--- a/test/classes/RelationCleanupTest.php
+++ b/test/classes/RelationCleanupTest.php
@@ -5,6 +5,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests;
 
 use PhpMyAdmin\DatabaseInterface;
diff --git a/test/classes/RelationTest.php b/test/classes/RelationTest.php
index 946dac3fa0..f59fbebc1e 100644
--- a/test/classes/RelationTest.php
+++ b/test/classes/RelationTest.php
@@ -5,6 +5,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests;
 
 use PhpMyAdmin\Relation;
diff --git a/test/classes/ReplicationGuiTest.php b/test/classes/ReplicationGuiTest.php
index 1761509b51..bacac3ca93 100644
--- a/test/classes/ReplicationGuiTest.php
+++ b/test/classes/ReplicationGuiTest.php
@@ -5,6 +5,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests;
 
 use PhpMyAdmin\DatabaseInterface;
diff --git a/test/classes/Rte/EventsTest.php b/test/classes/Rte/EventsTest.php
index 60e6819c26..831dd417b1 100644
--- a/test/classes/Rte/EventsTest.php
+++ b/test/classes/Rte/EventsTest.php
@@ -5,6 +5,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests\Rte;
 
 use PhpMyAdmin\Response;
diff --git a/test/classes/Rte/RoutinesTest.php b/test/classes/Rte/RoutinesTest.php
index 441f196c77..6ffacde19b 100644
--- a/test/classes/Rte/RoutinesTest.php
+++ b/test/classes/Rte/RoutinesTest.php
@@ -5,6 +5,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests\Rte;
 
 use PhpMyAdmin\DatabaseInterface;
diff --git a/test/classes/Rte/TriggersTest.php b/test/classes/Rte/TriggersTest.php
index 07d82fd038..a2119dd584 100644
--- a/test/classes/Rte/TriggersTest.php
+++ b/test/classes/Rte/TriggersTest.php
@@ -5,6 +5,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests\Rte;
 
 use PhpMyAdmin\Response;
diff --git a/test/classes/SanitizeTest.php b/test/classes/SanitizeTest.php
index 98aeb90c2f..acd53a5c7a 100644
--- a/test/classes/SanitizeTest.php
+++ b/test/classes/SanitizeTest.php
@@ -5,6 +5,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests;
 
 use PhpMyAdmin\Sanitize;
diff --git a/test/classes/ScriptsTest.php b/test/classes/ScriptsTest.php
index d793c236af..a7cca57b80 100644
--- a/test/classes/ScriptsTest.php
+++ b/test/classes/ScriptsTest.php
@@ -5,6 +5,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests;
 
 use PhpMyAdmin\Scripts;
diff --git a/test/classes/Server/PrivilegesTest.php b/test/classes/Server/PrivilegesTest.php
index 8deaae72bf..0bd603fbb2 100644
--- a/test/classes/Server/PrivilegesTest.php
+++ b/test/classes/Server/PrivilegesTest.php
@@ -5,6 +5,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests\Server;
 
 use PhpMyAdmin\Core;
diff --git a/test/classes/Server/SelectTest.php b/test/classes/Server/SelectTest.php
index 24f793f2b3..fe45a42160 100644
--- a/test/classes/Server/SelectTest.php
+++ b/test/classes/Server/SelectTest.php
@@ -5,6 +5,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests\Server;
 
 use PhpMyAdmin\Server\Select;
diff --git a/test/classes/Server/Status/AdvisorTest.php b/test/classes/Server/Status/AdvisorTest.php
index 6b27d715a9..0f22acda3d 100644
--- a/test/classes/Server/Status/AdvisorTest.php
+++ b/test/classes/Server/Status/AdvisorTest.php
@@ -5,6 +5,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests\Server\Status;
 
 use PhpMyAdmin\Core;
diff --git a/test/classes/Server/Status/DataTest.php b/test/classes/Server/Status/DataTest.php
index 2ecb9291ae..c005b7ec27 100644
--- a/test/classes/Server/Status/DataTest.php
+++ b/test/classes/Server/Status/DataTest.php
@@ -5,6 +5,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests\Server\Status;
 
 use PhpMyAdmin\Core;
diff --git a/test/classes/Server/Status/MonitorTest.php b/test/classes/Server/Status/MonitorTest.php
index 529c2b9552..6ca0444ee4 100644
--- a/test/classes/Server/Status/MonitorTest.php
+++ b/test/classes/Server/Status/MonitorTest.php
@@ -5,6 +5,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests\Server\Status;
 
 use PhpMyAdmin\Core;
diff --git a/test/classes/Server/Status/ProcessesTest.php b/test/classes/Server/Status/ProcessesTest.php
index a0bb4f97ab..065bf9b806 100644
--- a/test/classes/Server/Status/ProcessesTest.php
+++ b/test/classes/Server/Status/ProcessesTest.php
@@ -5,6 +5,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests\Server\Status;
 
 use PhpMyAdmin\Core;
diff --git a/test/classes/Server/Status/QueriesTest.php b/test/classes/Server/Status/QueriesTest.php
index 9ee99a4590..41f47117ed 100644
--- a/test/classes/Server/Status/QueriesTest.php
+++ b/test/classes/Server/Status/QueriesTest.php
@@ -5,6 +5,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests\Server\Status;
 
 use PhpMyAdmin\Core;
diff --git a/test/classes/Server/Status/VariablesTest.php b/test/classes/Server/Status/VariablesTest.php
index 34d80b5842..29080f0793 100644
--- a/test/classes/Server/Status/VariablesTest.php
+++ b/test/classes/Server/Status/VariablesTest.php
@@ -5,6 +5,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests\Server\Status;
 
 use PhpMyAdmin\Core;
diff --git a/test/classes/Server/StatusTest.php b/test/classes/Server/StatusTest.php
index 1177d3bb57..743dbc6186 100644
--- a/test/classes/Server/StatusTest.php
+++ b/test/classes/Server/StatusTest.php
@@ -5,6 +5,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests\Server;
 
 use PhpMyAdmin\Core;
diff --git a/test/classes/Server/UserGroupsTest.php b/test/classes/Server/UserGroupsTest.php
index c03bb60e16..9e2501b720 100644
--- a/test/classes/Server/UserGroupsTest.php
+++ b/test/classes/Server/UserGroupsTest.php
@@ -5,6 +5,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests\Server;
 
 use PhpMyAdmin\Server\UserGroups;
diff --git a/test/classes/Server/UsersTest.php b/test/classes/Server/UsersTest.php
index af7b741b18..7b5909afc2 100644
--- a/test/classes/Server/UsersTest.php
+++ b/test/classes/Server/UsersTest.php
@@ -5,6 +5,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests\Server;
 
 use PhpMyAdmin\Server\Users;
diff --git a/test/classes/Setup/ConfigGeneratorTest.php b/test/classes/Setup/ConfigGeneratorTest.php
index 8ba7af9a6d..89f146ffa1 100644
--- a/test/classes/Setup/ConfigGeneratorTest.php
+++ b/test/classes/Setup/ConfigGeneratorTest.php
@@ -5,6 +5,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests\Setup;
 
 use PhpMyAdmin\Config;
diff --git a/test/classes/Setup/FormProcessingTest.php b/test/classes/Setup/FormProcessingTest.php
index 9ba6f8af5e..f174571c40 100644
--- a/test/classes/Setup/FormProcessingTest.php
+++ b/test/classes/Setup/FormProcessingTest.php
@@ -5,6 +5,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests\Setup;
 
 use PhpMyAdmin\Setup\FormProcessing;
diff --git a/test/classes/Setup/IndexTest.php b/test/classes/Setup/IndexTest.php
index bca6a1028f..44f2182a59 100644
--- a/test/classes/Setup/IndexTest.php
+++ b/test/classes/Setup/IndexTest.php
@@ -5,6 +5,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests\Setup;
 
 use PhpMyAdmin\Setup\Index as SetupIndex;
diff --git a/test/classes/SqlQueryFormTest.php b/test/classes/SqlQueryFormTest.php
index 2efaf16a53..27d57c20fa 100644
--- a/test/classes/SqlQueryFormTest.php
+++ b/test/classes/SqlQueryFormTest.php
@@ -5,6 +5,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests;
 
 use PhpMyAdmin\Core;
diff --git a/test/classes/SqlTest.php b/test/classes/SqlTest.php
index 90e69f95d9..72c3865603 100644
--- a/test/classes/SqlTest.php
+++ b/test/classes/SqlTest.php
@@ -5,6 +5,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests;
 
 use PhpMyAdmin\Sql;
diff --git a/test/classes/StorageEngineTest.php b/test/classes/StorageEngineTest.php
index 7e333ee9cf..21420a2310 100644
--- a/test/classes/StorageEngineTest.php
+++ b/test/classes/StorageEngineTest.php
@@ -4,6 +4,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests;
 
 use PhpMyAdmin\StorageEngine;
diff --git a/test/classes/Stubs/Response.php b/test/classes/Stubs/Response.php
index 20e60e80f9..82eff4906c 100644
--- a/test/classes/Stubs/Response.php
+++ b/test/classes/Stubs/Response.php
@@ -10,6 +10,8 @@
  * @package    PhpMyAdmin
  * @subpackage Stubs
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests\Stubs;
 
 use PhpMyAdmin\Header;
diff --git a/test/classes/SysInfoTest.php b/test/classes/SysInfoTest.php
index b7cc317c57..7a60931a38 100644
--- a/test/classes/SysInfoTest.php
+++ b/test/classes/SysInfoTest.php
@@ -5,6 +5,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests;
 
 use PhpMyAdmin\SysInfo;
diff --git a/test/classes/SystemDatabaseTest.php b/test/classes/SystemDatabaseTest.php
index 74f95cd879..082a9ee8fd 100644
--- a/test/classes/SystemDatabaseTest.php
+++ b/test/classes/SystemDatabaseTest.php
@@ -5,6 +5,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests;
 
 use PhpMyAdmin\SystemDatabase;
diff --git a/test/classes/TableTest.php b/test/classes/TableTest.php
index 99e7352c6d..729e1f9df8 100644
--- a/test/classes/TableTest.php
+++ b/test/classes/TableTest.php
@@ -5,6 +5,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests;
 
 use PhpMyAdmin\DatabaseInterface;
diff --git a/test/classes/TemplateTest.php b/test/classes/TemplateTest.php
index 9fa13ee216..3543eb211e 100644
--- a/test/classes/TemplateTest.php
+++ b/test/classes/TemplateTest.php
@@ -5,6 +5,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests;
 
 use PhpMyAdmin\Template;
diff --git a/test/classes/ThemeManagerTest.php b/test/classes/ThemeManagerTest.php
index 33fd46756f..44091ec2cf 100644
--- a/test/classes/ThemeManagerTest.php
+++ b/test/classes/ThemeManagerTest.php
@@ -5,6 +5,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests;
 
 use PhpMyAdmin\Config;
diff --git a/test/classes/ThemeTest.php b/test/classes/ThemeTest.php
index 6325a74e77..f0019f248f 100644
--- a/test/classes/ThemeTest.php
+++ b/test/classes/ThemeTest.php
@@ -5,6 +5,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests;
 
 use PhpMyAdmin\Config;
diff --git a/test/classes/TrackerTest.php b/test/classes/TrackerTest.php
index c94c848231..30a7064a1f 100644
--- a/test/classes/TrackerTest.php
+++ b/test/classes/TrackerTest.php
@@ -5,6 +5,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests;
 
 use PhpMyAdmin\DatabaseInterface;
diff --git a/test/classes/TrackingTest.php b/test/classes/TrackingTest.php
index a92082ea85..4741318bd7 100644
--- a/test/classes/TrackingTest.php
+++ b/test/classes/TrackingTest.php
@@ -5,6 +5,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests;
 
 use PhpMyAdmin\Tracking;
diff --git a/test/classes/TransformationsTest.php b/test/classes/TransformationsTest.php
index 2f48461a60..3981c9d853 100644
--- a/test/classes/TransformationsTest.php
+++ b/test/classes/TransformationsTest.php
@@ -5,6 +5,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests;
 
 use PhpMyAdmin\Theme;
diff --git a/test/classes/TwoFactorTest.php b/test/classes/TwoFactorTest.php
index 89d7d01c05..260ab5513b 100644
--- a/test/classes/TwoFactorTest.php
+++ b/test/classes/TwoFactorTest.php
@@ -5,6 +5,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests;
 
 use PhpMyAdmin\TwoFactor;
diff --git a/test/classes/TypesTest.php b/test/classes/TypesTest.php
index a9b7fd64c2..66ab31c571 100644
--- a/test/classes/TypesTest.php
+++ b/test/classes/TypesTest.php
@@ -4,6 +4,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests;
 
 use PhpMyAdmin\Tests\PmaTestCase;
diff --git a/test/classes/UrlTest.php b/test/classes/UrlTest.php
index 2bce450315..92ec62c21f 100644
--- a/test/classes/UrlTest.php
+++ b/test/classes/UrlTest.php
@@ -5,6 +5,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests;
 
 use PhpMyAdmin\Url;
diff --git a/test/classes/UserPreferencesTest.php b/test/classes/UserPreferencesTest.php
index af0379af93..e9ffa8f921 100644
--- a/test/classes/UserPreferencesTest.php
+++ b/test/classes/UserPreferencesTest.php
@@ -5,6 +5,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests;
 
 use PhpMyAdmin\Config\ConfigFile;
diff --git a/test/classes/UtilTest.php b/test/classes/UtilTest.php
index eaf2039b68..939eb2f2c6 100644
--- a/test/classes/UtilTest.php
+++ b/test/classes/UtilTest.php
@@ -5,6 +5,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests;
 
 use PhpMyAdmin\Config;
@@ -864,15 +866,15 @@ class UtilTest extends PmaTestCase
         // Test with various precisions
         $old_precision = ini_get('precision');
         try {
-            ini_set('precision', 20);
+            ini_set('precision', '20');
             $this->assertFormatNumber($a, $b, $c, $d);
-            ini_set('precision', 14);
+            ini_set('precision', '14');
             $this->assertFormatNumber($a, $b, $c, $d);
-            ini_set('precision', 10);
+            ini_set('precision', '10');
             $this->assertFormatNumber($a, $b, $c, $d);
-            ini_set('precision', 5);
+            ini_set('precision', '5');
             $this->assertFormatNumber($a, $b, $c, $d);
-            ini_set('precision', -1);
+            ini_set('precision', '-1');
             $this->assertFormatNumber($a, $b, $c, $d);
         } finally {
             ini_set('precision', $old_precision);
diff --git a/test/classes/Utils/HttpRequestTest.php b/test/classes/Utils/HttpRequestTest.php
index c80f674127..3f2870ce1c 100644
--- a/test/classes/Utils/HttpRequestTest.php
+++ b/test/classes/Utils/HttpRequestTest.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 
 namespace PhpMyAdmin\Tests\Utils;
 
diff --git a/test/classes/VersionInformationTest.php b/test/classes/VersionInformationTest.php
index f0af6b55cd..e807f51697 100644
--- a/test/classes/VersionInformationTest.php
+++ b/test/classes/VersionInformationTest.php
@@ -5,6 +5,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests;
 
 use PhpMyAdmin\Tests\PmaTestCase;
diff --git a/test/classes/ZipExtensionTest.php b/test/classes/ZipExtensionTest.php
index f99fc6d285..6a8bfb8b5c 100644
--- a/test/classes/ZipExtensionTest.php
+++ b/test/classes/ZipExtensionTest.php
@@ -4,6 +4,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests;
 
 use PhpMyAdmin\Tests\PmaTestCase;
diff --git a/test/libraries/Files_test.php b/test/libraries/Files_test.php
index 97c0c6c6a6..b938478ce0 100644
--- a/test/libraries/Files_test.php
+++ b/test/libraries/Files_test.php
@@ -5,10 +5,7 @@
  *
  * @package PhpMyAdmin-test
  */
-
-/*
- * Include to test.
- */
+declare(strict_types=1);
 
 use PHPUnit\Framework\TestCase;
 
diff --git a/test/libraries/common/PMA_checkbox_test.php b/test/libraries/common/PMA_checkbox_test.php
index 85c9c4a9aa..3c19422157 100644
--- a/test/libraries/common/PMA_checkbox_test.php
+++ b/test/libraries/common/PMA_checkbox_test.php
@@ -6,10 +6,7 @@
  * @package PhpMyAdmin-test
  * @group common.lib-tests
  */
-
-/*
- * Include to test.
- */
+declare(strict_types=1);
 
 use PHPUnit\Framework\TestCase;
 
diff --git a/test/libraries/database_interface_test.php b/test/libraries/database_interface_test.php
index e247bf3e6d..5d46688a04 100644
--- a/test/libraries/database_interface_test.php
+++ b/test/libraries/database_interface_test.php
@@ -5,12 +5,9 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
 
-/*
- * Include to test.
- */
-
- use PHPUnit\Framework\TestCase;
+use PHPUnit\Framework\TestCase;
 
 /**
  * Tests basic functionality of dummy dbi driver
diff --git a/test/selenium/ChangePasswordTest.php b/test/selenium/ChangePasswordTest.php
index e3749853a9..df42299186 100644
--- a/test/selenium/ChangePasswordTest.php
+++ b/test/selenium/ChangePasswordTest.php
@@ -6,6 +6,7 @@
  * @package    PhpMyAdmin-test
  * @subpackage Selenium
  */
+declare(strict_types=1);
 
 namespace PhpMyAdmin\Tests\Selenium;
 
diff --git a/test/selenium/CreateDropDatabaseTest.php b/test/selenium/CreateDropDatabaseTest.php
index 6fe2dc6727..65c492cc22 100644
--- a/test/selenium/CreateDropDatabaseTest.php
+++ b/test/selenium/CreateDropDatabaseTest.php
@@ -6,6 +6,7 @@
  * @package    PhpMyAdmin-test
  * @subpackage Selenium
  */
+declare(strict_types=1);
 
 namespace PhpMyAdmin\Tests\Selenium;
 
diff --git a/test/selenium/CreateRemoveUserTest.php b/test/selenium/CreateRemoveUserTest.php
index 86fba66674..698a2b703e 100644
--- a/test/selenium/CreateRemoveUserTest.php
+++ b/test/selenium/CreateRemoveUserTest.php
@@ -6,6 +6,7 @@
  * @package    PhpMyAdmin-test
  * @subpackage Selenium
  */
+declare(strict_types=1);
 
 namespace PhpMyAdmin\Tests\Selenium;
 
diff --git a/test/selenium/DbEventsTest.php b/test/selenium/DbEventsTest.php
index 37f767bb3c..3f6a630459 100644
--- a/test/selenium/DbEventsTest.php
+++ b/test/selenium/DbEventsTest.php
@@ -6,6 +6,7 @@
  * @package    PhpMyAdmin-test
  * @subpackage Selenium
  */
+declare(strict_types=1);
 
 namespace PhpMyAdmin\Tests\Selenium;
 
diff --git a/test/selenium/DbOperationsTest.php b/test/selenium/DbOperationsTest.php
index e419baa042..b7d4369400 100644
--- a/test/selenium/DbOperationsTest.php
+++ b/test/selenium/DbOperationsTest.php
@@ -6,6 +6,7 @@
  * @package    PhpMyAdmin-test
  * @subpackage Selenium
  */
+declare(strict_types=1);
 
 namespace PhpMyAdmin\Tests\Selenium;
 
diff --git a/test/selenium/DbProceduresTest.php b/test/selenium/DbProceduresTest.php
index bf55326834..a0fb86b7b2 100644
--- a/test/selenium/DbProceduresTest.php
+++ b/test/selenium/DbProceduresTest.php
@@ -6,6 +6,7 @@
  * @package    PhpMyAdmin-test
  * @subpackage Selenium
  */
+declare(strict_types=1);
 
 namespace PhpMyAdmin\Tests\Selenium;
 
diff --git a/test/selenium/DbStructureTest.php b/test/selenium/DbStructureTest.php
index 96bbd4925c..d430354ac8 100644
--- a/test/selenium/DbStructureTest.php
+++ b/test/selenium/DbStructureTest.php
@@ -6,6 +6,7 @@
  * @package    PhpMyAdmin-test
  * @subpackage Selenium
  */
+declare(strict_types=1);
 
 namespace PhpMyAdmin\Tests\Selenium;
 
diff --git a/test/selenium/DbTriggersTest.php b/test/selenium/DbTriggersTest.php
index 830e2eb1c5..738bb63626 100644
--- a/test/selenium/DbTriggersTest.php
+++ b/test/selenium/DbTriggersTest.php
@@ -6,6 +6,7 @@
  * @package    PhpMyAdmin-test
  * @subpackage Selenium
  */
+declare(strict_types=1);
 
 namespace PhpMyAdmin\Tests\Selenium;
 
diff --git a/test/selenium/ExportTest.php b/test/selenium/ExportTest.php
index 214c0e6d90..31e64578a4 100644
--- a/test/selenium/ExportTest.php
+++ b/test/selenium/ExportTest.php
@@ -6,6 +6,7 @@
  * @package    PhpMyAdmin-test
  * @subpackage Selenium
  */
+declare(strict_types=1);
 
 namespace PhpMyAdmin\Tests\Selenium;
 
diff --git a/test/selenium/ImportTest.php b/test/selenium/ImportTest.php
index 3412fb7f0f..dfd3565db4 100644
--- a/test/selenium/ImportTest.php
+++ b/test/selenium/ImportTest.php
@@ -6,6 +6,7 @@
  * @package    PhpMyAdmin-test
  * @subpackage Selenium
  */
+declare(strict_types=1);
 
 namespace PhpMyAdmin\Tests\Selenium;
 
diff --git a/test/selenium/LoginTest.php b/test/selenium/LoginTest.php
index a33b35878d..bb2bdff3f8 100644
--- a/test/selenium/LoginTest.php
+++ b/test/selenium/LoginTest.php
@@ -6,6 +6,7 @@
  * @package    PhpMyAdmin-test
  * @subpackage Selenium
  */
+declare(strict_types=1);
 
 namespace PhpMyAdmin\Tests\Selenium;
 
diff --git a/test/selenium/NormalizationTest.php b/test/selenium/NormalizationTest.php
index 509497ef59..76b83789ae 100644
--- a/test/selenium/NormalizationTest.php
+++ b/test/selenium/NormalizationTest.php
@@ -6,6 +6,7 @@
  * @package    PhpMyAdmin-test
  * @subpackage Selenium
  */
+declare(strict_types=1);
 
 namespace PhpMyAdmin\Tests\Selenium;
 
diff --git a/test/selenium/QueryByExampleTest.php b/test/selenium/QueryByExampleTest.php
index e74b0b885c..12ff852e76 100644
--- a/test/selenium/QueryByExampleTest.php
+++ b/test/selenium/QueryByExampleTest.php
@@ -6,6 +6,7 @@
  * @package    PhpMyAdmin-test
  * @subpackage Selenium
  */
+declare(strict_types=1);
 
 namespace PhpMyAdmin\Tests\Selenium;
 
diff --git a/test/selenium/ServerSettingsTest.php b/test/selenium/ServerSettingsTest.php
index bb95b706e3..dbc547554d 100644
--- a/test/selenium/ServerSettingsTest.php
+++ b/test/selenium/ServerSettingsTest.php
@@ -6,6 +6,7 @@
  * @package    PhpMyAdmin-test
  * @subpackage Selenium
  */
+declare(strict_types=1);
 
 namespace PhpMyAdmin\Tests\Selenium;
 
diff --git a/test/selenium/SqlQueryTest.php b/test/selenium/SqlQueryTest.php
index f258b9b1db..e9379b6a8f 100644
--- a/test/selenium/SqlQueryTest.php
+++ b/test/selenium/SqlQueryTest.php
@@ -6,6 +6,7 @@
  * @package    PhpMyAdmin-test
  * @subpackage Selenium
  */
+declare(strict_types=1);
 
 namespace PhpMyAdmin\Tests\Selenium;
 
diff --git a/test/selenium/TableBrowseTest.php b/test/selenium/TableBrowseTest.php
index 335847657f..ed6d4789da 100644
--- a/test/selenium/TableBrowseTest.php
+++ b/test/selenium/TableBrowseTest.php
@@ -6,6 +6,7 @@
  * @package    PhpMyAdmin-test
  * @subpackage Selenium
  */
+declare(strict_types=1);
 
 namespace PhpMyAdmin\Tests\Selenium;
 
diff --git a/test/selenium/TableCreateTest.php b/test/selenium/TableCreateTest.php
index 17a893a490..becde358b8 100644
--- a/test/selenium/TableCreateTest.php
+++ b/test/selenium/TableCreateTest.php
@@ -6,6 +6,7 @@
  * @package    PhpMyAdmin-test
  * @subpackage Selenium
  */
+declare(strict_types=1);
 
 namespace PhpMyAdmin\Tests\Selenium;
 
diff --git a/test/selenium/TableInsertTest.php b/test/selenium/TableInsertTest.php
index e31191da34..9d05bc66ca 100644
--- a/test/selenium/TableInsertTest.php
+++ b/test/selenium/TableInsertTest.php
@@ -6,6 +6,7 @@
  * @package    PhpMyAdmin-test
  * @subpackage Selenium
  */
+declare(strict_types=1);
 
 namespace PhpMyAdmin\Tests\Selenium;
 
diff --git a/test/selenium/TableOperationsTest.php b/test/selenium/TableOperationsTest.php
index 8223bfb431..0ea691dee1 100644
--- a/test/selenium/TableOperationsTest.php
+++ b/test/selenium/TableOperationsTest.php
@@ -6,6 +6,7 @@
  * @package    PhpMyAdmin-test
  * @subpackage Selenium
  */
+declare(strict_types=1);
 
 namespace PhpMyAdmin\Tests\Selenium;
 
diff --git a/test/selenium/TableStructureTest.php b/test/selenium/TableStructureTest.php
index 788a931929..cd7fababdb 100644
--- a/test/selenium/TableStructureTest.php
+++ b/test/selenium/TableStructureTest.php
@@ -6,6 +6,7 @@
  * @package    PhpMyAdmin-test
  * @subpackage Selenium
  */
+declare(strict_types=1);
 
 namespace PhpMyAdmin\Tests\Selenium;
 
diff --git a/test/selenium/TestBase.php b/test/selenium/TestBase.php
index e679a818c5..024e078742 100644
--- a/test/selenium/TestBase.php
+++ b/test/selenium/TestBase.php
@@ -6,6 +6,8 @@
  * @package    PhpMyAdmin-test
  * @subpackage Selenium
  */
+declare(strict_types=1);
+
 namespace PhpMyAdmin\Tests\Selenium;
 
 use PHPUnit_Extensions_Selenium2TestCase as Selenium2TestCase;
@@ -201,7 +203,7 @@ abstract class TestBase extends Selenium2TestCase
             );
         }
         $this->database_name = $GLOBALS['TESTSUITE_DATABASE']
-            . mb_substr(md5(rand()), 0, 7);
+            . mb_substr(md5((string) rand()), 0, 7);
         $this->dbQuery(
             'CREATE DATABASE IF NOT EXISTS ' . $this->database_name
         );
diff --git a/test/selenium/TrackingTest.php b/test/selenium/TrackingTest.php
index 70dbcff916..6221a70f58 100644
--- a/test/selenium/TrackingTest.php
+++ b/test/selenium/TrackingTest.php
@@ -6,6 +6,7 @@
  * @package    PhpMyAdmin-test
  * @subpackage Selenium
  */
+declare(strict_types=1);
 
 namespace PhpMyAdmin\Tests\Selenium;
 
diff --git a/test/selenium/XssTest.php b/test/selenium/XssTest.php
index 3641047595..016ba7ccb2 100644
--- a/test/selenium/XssTest.php
+++ b/test/selenium/XssTest.php
@@ -6,6 +6,7 @@
  * @package    PhpMyAdmin-test
  * @subpackage Selenium
  */
+declare(strict_types=1);
 
 namespace PhpMyAdmin\Tests\Selenium;
 
diff --git a/test/test_data/config.inc.php b/test/test_data/config.inc.php
index acd0eb11bc..df94c3c594 100644
--- a/test/test_data/config.inc.php
+++ b/test/test_data/config.inc.php
@@ -4,6 +4,8 @@
  *
  * @package PhpMyAdmin-test
  */
+declare(strict_types=1);
+
 $i = 0;
 
 /* Server: localhost [1] */