Merge pull request #4208 from danxuliu/add-basic-acceptance-test-system

Add basic acceptance test system

24 files changed, 2135 insertions, 0 deletions

diff --git a/.drone.yml b/.drone.yml
index 2d4134957ad..9b6a01bd4f0 100644
--- a/.drone.yml
+++ b/.drone.yml
@@ -478,6 +478,20 @@ pipeline:
     when:
       matrix:
         TESTS: integration-trashbin
+  acceptance-access-levels:
+      image: nextcloudci/php7.0:php7.0-7
+      commands:
+        - tests/acceptance/run-local.sh allow-git-repository-modifications features/access-levels.feature
+      when:
+        matrix:
+          TESTS-ACCEPTANCE: access-levels
+  acceptance-login:
+      image: nextcloudci/php7.0:php7.0-7
+      commands:
+        - tests/acceptance/run-local.sh allow-git-repository-modifications features/login.feature
+      when:
+        matrix:
+          TESTS-ACCEPTANCE: login
   nodb-codecov:
     image: nextcloudci/php7.0:php7.0-7
     commands:
@@ -551,6 +565,10 @@ matrix:
     - TESTS: integration-transfer-ownership-features
     - TESTS: integration-ldap-features
     - TESTS: integration-trashbin
+    - TESTS: acceptance
+      TESTS-ACCEPTANCE: access-levels
+    - TESTS: acceptance
+      TESTS-ACCEPTANCE: login
     - TESTS: jsunit
     - TESTS: check-autoloader
     - TESTS: check-mergejs
@@ -626,5 +644,14 @@ services:
       when:
         matrix:
           OBJECT_STORE: s3
+  selenium:
+    image: selenium/standalone-firefox:2.53.1-beryllium
+    environment:
+      # Reduce default log level for Selenium server (INFO) as it is too
+      # verbose.
+      - JAVA_OPTS=-Dselenium.LOGGER.level=WARNING
+    when:
+      matrix:
+        TESTS: acceptance
 
 branches: [ master, stable* ]
diff --git a/tests/acceptance/composer.json b/tests/acceptance/composer.json
new file mode 100644
index 00000000000..87b6ba4a22c
--- /dev/null
+++ b/tests/acceptance/composer.json
@@ -0,0 +1,14 @@
+{
+  "require-dev": {
+    "behat/behat": "^3.0",
+    "behat/mink": "^1.5",
+    "behat/mink-extension": "*",
+    "behat/mink-selenium2-driver": "*",
+    "phpunit/phpunit": "~4.6"
+  },
+  "autoload": {
+    "psr-4": {
+      "": "features/core"
+    }
+  }
+}
diff --git a/tests/acceptance/config/behat.yml b/tests/acceptance/config/behat.yml
new file mode 100644
index 00000000000..6c3d9e4a7b9
--- /dev/null
+++ b/tests/acceptance/config/behat.yml
@@ -0,0 +1,26 @@
+default:
+  autoload:
+    '': %paths.base%/../features/bootstrap
+  suites:
+    default:
+      paths:
+        - %paths.base%/../features
+      contexts:
+        - ActorContext
+        - NextcloudTestServerContext
+
+        - FeatureContext
+        - FilesAppContext
+        - LoginPageContext
+        - NotificationContext
+        - SettingsMenuContext
+        - UsersSettingsContext
+  extensions:
+    Behat\MinkExtension:
+      sessions:
+        default:
+          selenium2: ~
+        John:
+          selenium2: ~
+        Jane:
+          selenium2: ~
diff --git a/tests/acceptance/features/access-levels.feature b/tests/acceptance/features/access-levels.feature
new file mode 100644
index 00000000000..57998899a57
--- /dev/null
+++ b/tests/acceptance/features/access-levels.feature
@@ -0,0 +1,21 @@
+Feature: access-levels
+
+  Scenario: regular users can not see admin-level items in the Settings menu
+    Given I am logged in
+    When I open the Settings menu
+    Then I see that the Settings menu is shown
+    And I see that the "Personal" item in the Settings menu is shown
+    And I see that the "Admin" item in the Settings menu is not shown
+    And I see that the "Users" item in the Settings menu is not shown
+    And I see that the "Help" item in the Settings menu is shown
+    And I see that the "Log out" item in the Settings menu is shown
+
+  Scenario: admin users can see admin-level items in the Settings menu
+    Given I am logged in as the admin
+    When I open the Settings menu
+    Then I see that the Settings menu is shown
+    And I see that the "Personal" item in the Settings menu is shown
+    And I see that the "Admin" item in the Settings menu is shown
+    And I see that the "Users" item in the Settings menu is shown
+    And I see that the "Help" item in the Settings menu is shown
+    And I see that the "Log out" item in the Settings menu is shown
diff --git a/tests/acceptance/features/bootstrap/FeatureContext.php b/tests/acceptance/features/bootstrap/FeatureContext.php
new file mode 100644
index 00000000000..a125ea01ccc
--- /dev/null
+++ b/tests/acceptance/features/bootstrap/FeatureContext.php
@@ -0,0 +1,37 @@
+<?php
+
+/**
+ *
+ * @copyright Copyright (c) 2017, Daniel Calviño Sánchez (danxuliu@gmail.com)
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+use Behat\Behat\Context\Context;
+
+class FeatureContext implements Context, ActorAwareInterface {
+
+	use ActorAware;
+
+	/**
+	 * @When I visit the Home page
+	 */
+	public function iVisitTheHomePage() {
+		$this->actor->getSession()->visit($this->actor->locatePath("/"));
+	}
+
+}
diff --git a/tests/acceptance/features/bootstrap/FilesAppContext.php b/tests/acceptance/features/bootstrap/FilesAppContext.php
new file mode 100644
index 00000000000..9702e64b552
--- /dev/null
+++ b/tests/acceptance/features/bootstrap/FilesAppContext.php
@@ -0,0 +1,39 @@
+<?php
+
+/**
+ *
+ * @copyright Copyright (c) 2017, Daniel Calviño Sánchez (danxuliu@gmail.com)
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+use Behat\Behat\Context\Context;
+
+class FilesAppContext implements Context, ActorAwareInterface {
+
+	use ActorAware;
+
+	/**
+	 * @Then I see that the current page is the Files app
+	 */
+	public function iSeeThatTheCurrentPageIsTheFilesApp() {
+		PHPUnit_Framework_Assert::assertStringStartsWith(
+				$this->actor->locatePath("/apps/files/"),
+				$this->actor->getSession()->getCurrentUrl());
+	}
+
+}
diff --git a/tests/acceptance/features/bootstrap/LoginPageContext.php b/tests/acceptance/features/bootstrap/LoginPageContext.php
new file mode 100644
index 00000000000..4b0672f652c
--- /dev/null
+++ b/tests/acceptance/features/bootstrap/LoginPageContext.php
@@ -0,0 +1,137 @@
+<?php
+
+/**
+ *
+ * @copyright Copyright (c) 2017, Daniel Calviño Sánchez (danxuliu@gmail.com)
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+use Behat\Behat\Context\Context;
+use Behat\Behat\Hook\Scope\BeforeScenarioScope;
+
+class LoginPageContext implements Context, ActorAwareInterface {
+
+	use ActorAware;
+
+	/**
+	 * @var FeatureContext
+	 */
+	private $featureContext;
+
+	/**
+	 * @var FilesAppContext
+	 */
+	private $filesAppContext;
+
+	/**
+	 * @return Locator
+	 */
+	public static function userNameField() {
+		return Locator::forThe()->field("user")->
+				describedAs("User name field in Login page");
+	}
+
+	/**
+	 * @return Locator
+	 */
+	public static function passwordField() {
+		return Locator::forThe()->field("password")->
+				describedAs("Password field in Login page");
+	}
+
+	/**
+	 * @return Locator
+	 */
+	public static function loginButton() {
+		return Locator::forThe()->id("submit")->
+				describedAs("Login button in Login page");
+	}
+
+	/**
+	 * @return Locator
+	 */
+	public static function wrongPasswordMessage() {
+		return Locator::forThe()->content("Wrong password. Reset it?")->
+				describedAs("Wrong password message in Login page");
+	}
+
+	/**
+	 * @When I log in with user :user and password :password
+	 */
+	public function iLogInWithUserAndPassword($user, $password) {
+		$this->actor->find(self::userNameField(), 10)->setValue($user);
+		$this->actor->find(self::passwordField())->setValue($password);
+		$this->actor->find(self::loginButton())->click();
+	}
+
+	/**
+	 * @Then I see that the current page is the Login page
+	 */
+	public function iSeeThatTheCurrentPageIsTheLoginPage() {
+		PHPUnit_Framework_Assert::assertStringStartsWith(
+				$this->actor->locatePath("/login"),
+				$this->actor->getSession()->getCurrentUrl());
+	}
+
+	/**
+	 * @Then I see that a wrong password message is shown
+	 */
+	public function iSeeThatAWrongPasswordMessageIsShown() {
+		PHPUnit_Framework_Assert::assertTrue(
+				$this->actor->find(self::wrongPasswordMessage(), 10)->isVisible());
+	}
+
+	/**
+	 * @BeforeScenario
+	 */
+	public function getOtherRequiredSiblingContexts(BeforeScenarioScope $scope) {
+		$environment = $scope->getEnvironment();
+
+		$this->featureContext = $environment->getContext("FeatureContext");
+		$this->filesAppContext = $environment->getContext("FilesAppContext");
+	}
+
+	/**
+	 * @Given I am logged in
+	 */
+	public function iAmLoggedIn() {
+		$this->featureContext->iVisitTheHomePage();
+		$this->iLogInWithUserAndPassword("user0", "123456acb");
+		$this->filesAppContext->iSeeThatTheCurrentPageIsTheFilesApp();
+	}
+
+	/**
+	 * @Given I am logged in as the admin
+	 */
+	public function iAmLoggedInAsTheAdmin() {
+		$this->featureContext->iVisitTheHomePage();
+		$this->iLogInWithUserAndPassword("admin", "admin");
+		$this->filesAppContext->iSeeThatTheCurrentPageIsTheFilesApp();
+	}
+
+	/**
+	 * @Given I can not log in with user :user and password :password
+	 */
+	public function iCanNotLogInWithUserAndPassword($user, $password) {
+		$this->featureContext->iVisitTheHomePage();
+		$this->iLogInWithUserAndPassword($user, $password);
+		$this->iSeeThatTheCurrentPageIsTheLoginPage();
+		$this->iSeeThatAWrongPasswordMessageIsShown();
+	}
+
+}
diff --git a/tests/acceptance/features/bootstrap/NotificationContext.php b/tests/acceptance/features/bootstrap/NotificationContext.php
new file mode 100644
index 00000000000..f8b784e2465
--- /dev/null
+++ b/tests/acceptance/features/bootstrap/NotificationContext.php
@@ -0,0 +1,54 @@
+<?php
+
+/**
+ *
+ * @copyright Copyright (c) 2017, Daniel Calviño Sánchez (danxuliu@gmail.com)
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+use Behat\Behat\Context\Context;
+
+class NotificationContext implements Context, ActorAwareInterface {
+
+	use ActorAware;
+
+	/**
+	 * @return Locator
+	 */
+	public static function notificationMessage($message) {
+		return Locator::forThe()->content($message)->descendantOf(self::notificationContainer())->
+				describedAs("$message notification");
+	}
+
+	/**
+	 * @return Locator
+	 */
+	private static function notificationContainer() {
+		return Locator::forThe()->id("notification-container")->
+				describedAs("Notification container");
+	}
+
+	/**
+	 * @Then I see that the :message notification is shown
+	 */
+	public function iSeeThatTheNotificationIsShown($message) {
+		PHPUnit_Framework_Assert::assertTrue($this->actor->find(
+				self::notificationMessage($message), 10)->isVisible());
+	}
+
+}
diff --git a/tests/acceptance/features/bootstrap/SettingsMenuContext.php b/tests/acceptance/features/bootstrap/SettingsMenuContext.php
new file mode 100644
index 00000000000..9ce8df4caef
--- /dev/null
+++ b/tests/acceptance/features/bootstrap/SettingsMenuContext.php
@@ -0,0 +1,122 @@
+<?php
+
+/**
+ *
+ * @copyright Copyright (c) 2017, Daniel Calviño Sánchez (danxuliu@gmail.com)
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+use Behat\Behat\Context\Context;
+
+class SettingsMenuContext implements Context, ActorAwareInterface {
+
+	use ActorAware;
+
+	/**
+	 * @return Locator
+	 */
+	public static function settingsMenuButton() {
+		return Locator::forThe()->xpath("//*[@id = 'header']//*[@id = 'settings']")->
+				describedAs("Settings menu button");
+	}
+
+	/**
+	 * @return Locator
+	 */
+	public static function settingsMenu() {
+		return Locator::forThe()->id("expanddiv")->descendantOf(self::settingsMenuButton())->
+				describedAs("Settings menu");
+	}
+
+	/**
+	 * @return Locator
+	 */
+	public static function usersMenuItem() {
+		return self::menuItemFor("Users");
+	}
+
+	/**
+	 * @return Locator
+	 */
+	public static function logOutMenuItem() {
+		return self::menuItemFor("Log out");
+	}
+
+	/**
+	 * @return Locator
+	 */
+	private static function menuItemFor($itemText) {
+		return Locator::forThe()->content($itemText)->descendantOf(self::settingsMenu())->
+				describedAs($itemText . " item in Settings menu");
+	}
+
+	/**
+	 * @When I open the Settings menu
+	 */
+	public function iOpenTheSettingsMenu() {
+		$this->actor->find(self::settingsMenuButton(), 10)->click();
+	}
+
+	/**
+	 * @When I open the User settings
+	 */
+	public function iOpenTheUserSettings() {
+		$this->iOpenTheSettingsMenu();
+
+		$this->actor->find(self::usersMenuItem(), 2)->click();
+	}
+
+	/**
+	 * @When I log out
+	 */
+	public function iLogOut() {
+		$this->iOpenTheSettingsMenu();
+
+		$this->actor->find(self::logOutMenuItem(), 2)->click();
+	}
+
+	/**
+	 * @Then I see that the Settings menu is shown
+	 */
+	public function iSeeThatTheSettingsMenuIsShown() {
+		PHPUnit_Framework_Assert::assertTrue(
+				$this->actor->find(self::settingsMenu(), 10)->isVisible());
+	}
+
+	/**
+	 * @Then I see that the :itemText item in the Settings menu is shown
+	 */
+	public function iSeeThatTheItemInTheSettingsMenuIsShown($itemText) {
+		PHPUnit_Framework_Assert::assertTrue(
+				$this->actor->find(self::menuItemFor($itemText), 10)->isVisible());
+	}
+
+	/**
+	 * @Then I see that the :itemText item in the Settings menu is not shown
+	 */
+	public function iSeeThatTheItemInTheSettingsMenuIsNotShown($itemText) {
+		$this->iSeeThatTheSettingsMenuIsShown();
+
+		try {
+			PHPUnit_Framework_Assert::assertFalse(
+					$this->actor->find(self::menuItemFor($itemText))->isVisible());
+		} catch (NoSuchElementException $exception) {
+		}
+	}
+
+}
diff --git a/tests/acceptance/features/bootstrap/UsersSettingsContext.php b/tests/acceptance/features/bootstrap/UsersSettingsContext.php
new file mode 100644
index 00000000000..93ab7246eb6
--- /dev/null
+++ b/tests/acceptance/features/bootstrap/UsersSettingsContext.php
@@ -0,0 +1,102 @@
+<?php
+
+/**
+ *
+ * @copyright Copyright (c) 2017, Daniel Calviño Sánchez (danxuliu@gmail.com)
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+use Behat\Behat\Context\Context;
+
+class UsersSettingsContext implements Context, ActorAwareInterface {
+
+	use ActorAware;
+
+	/**
+	 * @return Locator
+	 */
+	public static function userNameFieldForNewUser() {
+		return Locator::forThe()->field("newusername")->
+				describedAs("User name field for new user in Users Settings");
+	}
+
+	/**
+	 * @return Locator
+	 */
+	public static function passwordFieldForNewUser() {
+		return Locator::forThe()->field("newuserpassword")->
+				describedAs("Password field for new user in Users Settings");
+	}
+
+	/**
+	 * @return Locator
+	 */
+	public static function createNewUserButton() {
+		return Locator::forThe()->xpath("//form[@id = 'newuser']//input[@type = 'submit']")->
+				describedAs("Create user button in Users Settings");
+	}
+
+	/**
+	 * @return Locator
+	 */
+	public static function rowForUser($user) {
+		return Locator::forThe()->xpath("//table[@id = 'userlist']//th[normalize-space() = '$user']/..")->
+				describedAs("Row for user $user in Users Settings");
+	}
+
+	/**
+	 * @return Locator
+	 */
+	public static function passwordCellForUser($user) {
+		return Locator::forThe()->css(".password")->descendantOf(self::rowForUser($user))->
+				describedAs("Password cell for user $user in Users Settings");
+	}
+
+	/**
+	 * @return Locator
+	 */
+	public static function passwordInputForUser($user) {
+		return Locator::forThe()->css("input")->descendantOf(self::passwordCellForUser($user))->
+				describedAs("Password input for user $user in Users Settings");
+	}
+
+	/**
+	 * @When I create user :user with password :password
+	 */
+	public function iCreateUserWithPassword($user, $password) {
+		$this->actor->find(self::userNameFieldForNewUser(), 10)->setValue($user);
+		$this->actor->find(self::passwordFieldForNewUser())->setValue($password);
+		$this->actor->find(self::createNewUserButton())->click();
+	}
+
+	/**
+	 * @When I set the password for :user to :password
+	 */
+	public function iSetThePasswordForUserTo($user, $password) {
+		$this->actor->find(self::passwordCellForUser($user), 10)->click();
+		$this->actor->find(self::passwordInputForUser($user), 2)->setValue($password . "\r");
+	}
+
+	/**
+	 * @Then I see that the list of users contains the user :user
+	 */
+	public function iSeeThatTheListOfUsersContainsTheUser($user) {
+		PHPUnit_Framework_Assert::assertNotNull($this->actor->find(self::rowForUser($user), 10));
+	}
+
+}
diff --git a/tests/acceptance/features/core/Actor.php b/tests/acceptance/features/core/Actor.php
new file mode 100644
index 00000000000..a27e8e6a015
--- /dev/null
+++ b/tests/acceptance/features/core/Actor.php
@@ -0,0 +1,224 @@
+<?php
+
+/**
+ *
+ * @copyright Copyright (c) 2017, Daniel Calviño Sánchez (danxuliu@gmail.com)
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+/**
+ * An actor in a test scenario.
+ *
+ * Every Actor object is intended to be used only in a single test scenario.
+ * An Actor can control its web browser thanks to the Mink Session received when
+ * it was created, so in each scenario each Actor must have its own Mink
+ * Session; the same Mink Session can be used by different Actors in different
+ * scenarios, but never by different Actors in the same scenario.
+ *
+ * The test servers used in an scenario can change between different test runs,
+ * so an Actor stores the base URL for the current test server being used; in
+ * most cases the tests are specified using relative paths that can be converted
+ * to the appropriate absolute URL using locatePath() in the step
+ * implementation.
+ *
+ * An Actor can find elements in its Mink Session using its find() method; it is
+ * a wrapper over the find() method provided by Mink that extends it with
+ * several features: the element can be looked for based on a Locator object, an
+ * exception is thrown if the element is not found, and, optionally, it is
+ * possible to try again to find the element several times before giving up.
+ *
+ * The amount of time to wait before giving up is specified in each call to
+ * find(). However, a general multiplier to be applied to every timeout can be
+ * set using setFindTimeoutMultiplier(); this makes possible to retry longer
+ * before giving up without modifying the tests themselves. Note that the
+ * multiplier affects the timeout, but not the timeout step; the rate at which
+ * find() will try again to find the element does not change.
+ */
+class Actor {
+
+	/**
+	 * @var \Behat\Mink\Session
+	 */
+	private $session;
+
+	/**
+	 * @var string
+	 */
+	private $baseUrl;
+
+	/**
+	 * @var float
+	 */
+	private $findTimeoutMultiplier;
+
+	/**
+	 * Creates a new Actor.
+	 *
+	 * @param \Behat\Mink\Session $session the Mink Session used to control its
+	 *        web browser.
+	 * @param string $baseUrl the base URL used when solving relative URLs.
+	 */
+	public function __construct(\Behat\Mink\Session $session, $baseUrl) {
+		$this->session = $session;
+		$this->baseUrl = $baseUrl;
+		$this->findTimeoutMultiplier = 1;
+	}
+
+	/**
+	 * Sets the base URL.
+	 *
+	 * @param string $baseUrl the base URL used when solving relative URLs.
+	 */
+	public function setBaseUrl($baseUrl) {
+		$this->baseUrl = $baseUrl;
+	}
+
+	/**
+	 * Sets the multiplier for find timeouts.
+	 *
+	 * @param float $findTimeoutMultiplier the multiplier to apply to find
+	 *        timeouts.
+	 */
+	public function setFindTimeoutMultiplier($findTimeoutMultiplier) {
+		$this->findTimeoutMultiplier = $findTimeoutMultiplier;
+	}
+
+	/**
+	 * Returns the Mink Session used to control its web browser.
+	 *
+	 * @return \Behat\Mink\Session the Mink Session used to control its web
+	 *         browser.
+	 */
+	public function getSession() {
+		return $this->session;
+	}
+
+	/**
+	 * Returns the full path for the given relative path based on the base URL.
+	 *
+	 * @param string relativePath the relative path.
+	 * @return string the full path.
+	 */
+	public function locatePath($relativePath) {
+		return $this->baseUrl . $relativePath;
+	}
+
+	/**
+	 * Finds an element in the Mink Session of this Actor.
+	 *
+	 * The given element locator is relative to its ancestor (either another
+	 * locator or an actual element); if it has no ancestor then the base
+	 * document element is used.
+	 *
+	 * Sometimes an element may not be found simply because it has not appeared
+	 * yet; for those cases this method supports trying again to find the
+	 * element several times before giving up. The timeout parameter controls
+	 * how much time to wait, at most, to find the element; the timeoutStep
+	 * parameter controls how much time to wait before trying again to find the
+	 * element. If ancestor locators need to be found the timeout is applied
+	 * individually to each one, that is, if the timeout is 10 seconds the
+	 * method will wait up to 10 seconds to find the ancestor of the ancestor
+	 * and, then, up to 10 seconds to find the ancestor and, then, up to 10
+	 * seconds to find the element. By default the timeout is 0, so the element
+	 * and its ancestor will be looked for just once; the default time to wait
+	 * before retrying is half a second. If the timeout is not 0 it will be
+	 * affected by the multiplier set using setFindTimeoutMultiplier(), if any.
+	 *
+	 * In any case, if the element, or its ancestors, can not be found a
+	 * NoSuchElementException is thrown.
+	 *
+	 * @param Locator $elementLocator the locator for the element.
+	 * @param float $timeout the number of seconds (decimals allowed) to wait at
+	 *        most for the element to appear.
+	 * @param float $timeoutStep the number of seconds (decimals allowed) to
+	 *        wait before trying to find the element again.
+	 * @return \Behat\Mink\Element\Element the element found.
+	 * @throws NoSuchElementException if the element, or its ancestor, can not
+	 *         be found.
+	 */
+	public function find($elementLocator, $timeout = 0, $timeoutStep = 0.5) {
+		$timeout = $timeout * $this->findTimeoutMultiplier;
+
+		$element = null;
+		$selector = $elementLocator->getSelector();
+		$locator = $elementLocator->getLocator();
+		$ancestorElement = $this->findAncestorElement($elementLocator, $timeout, $timeoutStep);
+
+		$findCallback = function() use (&$element, $selector, $locator, $ancestorElement) {
+			$element = $ancestorElement->find($selector, $locator);
+
+			return $element !== null;
+		};
+		if (!Utils::waitFor($findCallback, $timeout, $timeoutStep)) {
+			$message = $elementLocator->getDescription() . " could not be found";
+			if ($timeout > 0) {
+				$message = $message . " after $timeout seconds";
+			}
+			throw new NoSuchElementException($message);
+		}
+
+		return $element;
+	}
+
+	/**
+	 * Returns the ancestor element from which the given locator will be looked
+	 * for.
+	 *
+	 * If the ancestor of the given locator is another locator the element for
+	 * the ancestor locator is found and returned. If the ancestor of the given
+	 * locator is already an element that element is the one returned. If the
+	 * given locator has no ancestor then the base document element is returned.
+	 *
+	 * The timeout is used only when finding the element for the ancestor
+	 * locator; if the timeout expires a NoSuchElementException is thrown.
+	 *
+	 * @param Locator $elementLocator the locator for the element to get its
+	 *        ancestor.
+	 * @param float $timeout the number of seconds (decimals allowed) to wait at
+	 *        most for the ancestor element to appear.
+	 * @param float $timeoutStep the number of seconds (decimals allowed) to
+	 *        wait before trying to find the ancestor element again.
+	 * @return \Behat\Mink\Element\Element the ancestor element found.
+	 * @throws NoSuchElementException if the ancestor element can not be found.
+	 */
+	private function findAncestorElement($elementLocator, $timeout, $timeoutStep) {
+		$ancestorElement = $elementLocator->getAncestor();
+		if ($ancestorElement instanceof Locator) {
+			try {
+				$ancestorElement = $this->find($ancestorElement, $timeout, $timeoutStep);
+			} catch (NoSuchElementException $exception) {
+				// Little hack to show the stack of ancestor elements that could
+				// not be found, as Behat only shows the message of the last
+				// exception in the chain.
+				$message = $exception->getMessage() . "\n" .
+						   $elementLocator->getDescription() . " could not be found";
+				if ($timeout > 0) {
+					$message = $message . " after $timeout seconds";
+				}
+				throw new NoSuchElementException($message, $exception);
+			}
+		}
+
+		if ($ancestorElement === null) {
+			$ancestorElement = $this->getSession()->getPage();
+		}
+
+		return $ancestorElement;
+	}
+
+}
diff --git a/tests/acceptance/features/core/ActorAware.php b/tests/acceptance/features/core/ActorAware.php
new file mode 100644
index 00000000000..f1d355c1b0e
--- /dev/null
+++ b/tests/acceptance/features/core/ActorAware.php
@@ -0,0 +1,38 @@
+<?php
+
+/**
+ *
+ * @copyright Copyright (c) 2017, Daniel Calviño Sánchez (danxuliu@gmail.com)
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+trait ActorAware {
+
+	/**
+	 * @var Actor
+	 */
+	private $actor;
+
+	/**
+	 * @param Actor $actor
+	 */
+	public function setCurrentActor(Actor $actor) {
+		$this->actor = $actor;
+	}
+
+}
diff --git a/tests/acceptance/features/core/ActorAwareInterface.php b/tests/acceptance/features/core/ActorAwareInterface.php
new file mode 100644
index 00000000000..9363bc3e607
--- /dev/null
+++ b/tests/acceptance/features/core/ActorAwareInterface.php
@@ -0,0 +1,31 @@
+<?php
+
+/**
+ *
+ * @copyright Copyright (c) 2017, Daniel Calviño Sánchez (danxuliu@gmail.com)
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+interface ActorAwareInterface {
+
+	/**
+	 * @param Actor $actor
+	 */
+	public function setCurrentActor(Actor $actor);
+
+}
diff --git a/tests/acceptance/features/core/ActorContext.php b/tests/acceptance/features/core/ActorContext.php
new file mode 100644
index 00000000000..9667ef2f01c
--- /dev/null
+++ b/tests/acceptance/features/core/ActorContext.php
@@ -0,0 +1,148 @@
+<?php
+
+/**
+ *
+ * @copyright Copyright (c) 2017, Daniel Calviño Sánchez (danxuliu@gmail.com)
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+use Behat\Behat\Hook\Scope\BeforeStepScope;
+use Behat\MinkExtension\Context\RawMinkContext;
+
+/**
+ * Behat context to set the actor used in sibling contexts.
+ *
+ * This helper context provides a step definition ("I act as XXX") to change the
+ * current actor of the scenario, which makes possible to use different browser
+ * sessions in the same scenario.
+ *
+ * Sibling contexts that want to have access to the current actor of the
+ * scenario must implement the ActorAwareInterface; this can be done just by
+ * using the ActorAware trait.
+ *
+ * Besides updating the current actor in sibling contexts the ActorContext also
+ * propagates its inherited "base_url" Mink parameter to the Actors as needed.
+ *
+ * By default no multiplier for the find timeout is set in the Actors. However,
+ * it can be customized using the "actorFindTimeoutMultiplier" parameter of the
+ * ActorContext in "behat.yml".
+ *
+ * Every actor used in the scenarios must have a corresponding Mink session
+ * declared in "behat.yml" with the same name as the actor. All used sessions
+ * are stopped after each scenario is run.
+ */
+class ActorContext extends RawMinkContext {
+
+	/**
+	 * @var array
+	 */
+	private $actors;
+
+	/**
+	 * @var Actor
+	 */
+	private $currentActor;
+
+	/**
+	 * @var float
+	 */
+	private $actorFindTimeoutMultiplier;
+
+	/**
+	 * Creates a new ActorContext.
+	 *
+	 * @param float $actorFindTimeoutMultiplier the find timeout multiplier to
+	 *        set in the Actors.
+	 */
+	public function __construct($actorFindTimeoutMultiplier = 1) {
+		$this->actorFindTimeoutMultiplier = $actorFindTimeoutMultiplier;
+	}
+
+	/**
+	 * Sets a Mink parameter.
+	 *
+	 * When the "base_url" parameter is set its value is propagated to all the
+	 * Actors.
+	 *
+	 * @param string $name the name of the parameter.
+	 * @param string $value the value of the parameter.
+	 */
+	public function setMinkParameter($name, $value) {
+		parent::setMinkParameter($name, $value);
+
+		if ($name === "base_url") {
+			foreach ($this->actors as $actor) {
+				$actor->setBaseUrl($value);
+			}
+		}
+	}
+
+	/**
+	 * @BeforeScenario
+	 *
+	 * Initializes the Actors for the new Scenario with the default Actor.
+	 *
+	 * Other Actors are added (and their Mink Sessions started) only when they
+	 * are used in an "I act as XXX" step.
+	 */
+	public function initializeActors() {
+		$this->actors = array();
+
+		$this->actors["default"] = new Actor($this->getSession(), $this->getMinkParameter("base_url"));
+		$this->actors["default"]->setFindTimeoutMultiplier($this->actorFindTimeoutMultiplier);
+
+		$this->currentActor = $this->actors["default"];
+	}
+
+	/**
+	 * @BeforeStep
+	 */
+	public function setCurrentActorInSiblingActorAwareContexts(BeforeStepScope $scope) {
+		$environment = $scope->getEnvironment();
+
+		foreach ($environment->getContexts() as $context) {
+			if ($context instanceof ActorAwareInterface) {
+				$context->setCurrentActor($this->currentActor);
+			}
+		}
+	}
+
+	/**
+	 * @Given I act as :actorName
+	 */
+	public function iActAs($actorName) {
+		if (!array_key_exists($actorName, $this->actors)) {
+			$this->actors[$actorName] = new Actor($this->getSession($actorName), $this->getMinkParameter("base_url"));
+			$this->actors[$actorName]->setFindTimeoutMultiplier($this->actorFindTimeoutMultiplier);
+		}
+
+		$this->currentActor = $this->actors[$actorName];
+	}
+
+	/**
+	 * @AfterScenario
+	 *
+	 * Stops all the Mink Sessions used in the last Scenario.
+	 */
+	public function cleanUpSessions() {
+		foreach ($this->actors as $actor) {
+			$actor->getSession()->stop();
+		}
+	}
+
+}
diff --git a/tests/acceptance/features/core/Locator.php b/tests/acceptance/features/core/Locator.php
new file mode 100644
index 00000000000..0ebae9b8fb1
--- /dev/null
+++ b/tests/acceptance/features/core/Locator.php
@@ -0,0 +1,329 @@
+<?php
+
+/**
+ *
+ * @copyright Copyright (c) 2017, Daniel Calviño Sánchez (danxuliu@gmail.com)
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+/**
+ * Data object for the information needed to locate an element in a web page
+ * using Mink.
+ *
+ * Locators can be created directly using the constructor, or through a more
+ * fluent interface with Locator::forThe().
+ */
+class Locator {
+
+	/**
+	 * @var string
+	 */
+	private $description;
+
+	/**
+	 * @var string
+	 */
+	private $selector;
+
+	/**
+	 * @var string|array
+	 */
+	private $locator;
+
+	/**
+	 * @var null|Locator|\Behat\Mink\Element\ElementInterface
+	 */
+	private $ancestor;
+
+	/**
+	 * Starting point for the fluent interface to create Locators.
+	 *
+	 * @return LocatorBuilder
+	 */
+	public static function forThe() {
+		return new LocatorBuilder();
+	}
+
+	/**
+	 * @param string $description
+	 * @param string $selector
+	 * @param string|array $locator
+	 * @param null|Locator|\Behat\Mink\Element\ElementInterface $ancestor
+	 */
+	public function __construct($description, $selector, $locator, $ancestor = null) {
+		$this->description = $description;
+		$this->selector = $selector;
+		$this->locator = $locator;
+		$this->ancestor = $ancestor;
+	}
+
+	/**
+	 * @return string
+	 */
+	public function getDescription() {
+		return $this->description;
+	}
+
+	/**
+	 * @return string
+	 */
+	public function getSelector() {
+		return $this->selector;
+	}
+
+	/**
+	 * @return string|array
+	 */
+	public function getLocator() {
+		return $this->locator;
+	}
+
+	/**
+	 * @return null|Locator|\Behat\Mink\Element\ElementInterface
+	 */
+	public function getAncestor() {
+		return $this->ancestor;
+	}
+
+}
+
+class LocatorBuilder {
+
+	/**
+	 * @param string $selector
+	 * @param string|array $locator
+	 * @return LocatorBuilderSecondStep
+	 */
+	public function customSelector($selector, $locator) {
+		return new LocatorBuilderSecondStep($selector, $locator);
+	}
+
+	/**
+	 * @param string $cssExpression
+	 * @return LocatorBuilderSecondStep
+	 */
+	public function css($cssExpression) {
+		return $this->customSelector("css", $cssExpression);
+	}
+
+	/**
+	 * @param string $xpathExpression
+	 * @return LocatorBuilderSecondStep
+	 */
+	public function xpath($xpathExpression) {
+		return $this->customSelector("xpath", $xpathExpression);
+	}
+
+	/**
+	 * @param string $value
+	 * @return LocatorBuilderSecondStep
+	 */
+	public function id($value) {
+		return $this->customSelector("named", array("id", $value));
+	}
+
+	/**
+	 * @param string $value
+	 * @return LocatorBuilderSecondStep
+	 */
+	public function idOrName($value) {
+		return $this->customSelector("named", array("id_or_name", $value));
+	}
+
+	/**
+	 * @param string $value
+	 * @return LocatorBuilderSecondStep
+	 */
+	public function link($value) {
+		return $this->customSelector("named", array("link", $value));
+	}
+
+	/**
+	 * @param string $value
+	 * @return LocatorBuilderSecondStep
+	 */
+	public function button($value) {
+		return $this->customSelector("named", array("button", $value));
+	}
+
+	/**
+	 * @param string $value
+	 * @return LocatorBuilderSecondStep
+	 */
+	public function linkOrButton($value) {
+		return $this->customSelector("named", array("link_or_button", $value));
+	}
+
+	/**
+	 * @param string $value
+	 * @return LocatorBuilderSecondStep
+	 */
+	public function content($value) {
+		return $this->customSelector("named", array("content", $value));
+	}
+
+	/**
+	 * @param string $value
+	 * @return LocatorBuilderSecondStep
+	 */
+	public function field($value) {
+		return $this->customSelector("named", array("field", $value));
+	}
+
+	/**
+	 * @param string $value
+	 * @return LocatorBuilderSecondStep
+	 */
+	public function selectField($value) {
+		return $this->customSelector("named", array("select", $value));
+	}
+
+	/**
+	 * @param string $value
+	 * @return LocatorBuilderSecondStep
+	 */
+	public function checkbox($value) {
+		return $this->customSelector("named", array("checkbox", $value));
+	}
+
+	/**
+	 * @param string $value
+	 * @return LocatorBuilderSecondStep
+	 */
+	public function radioButton($value) {
+		return $this->customSelector("named", array("radio", $value));
+	}
+
+	/**
+	 * @param string $value
+	 * @return LocatorBuilderSecondStep
+	 */
+	public function fileInput($value) {
+		return $this->customSelector("named", array("file", $value));
+	}
+
+	/**
+	 * @param string $value
+	 * @return LocatorBuilderSecondStep
+	 */
+	public function optionGroup($value) {
+		return $this->customSelector("named", array("optgroup", $value));
+	}
+
+	/**
+	 * @param string $value
+	 * @return LocatorBuilderSecondStep
+	 */
+	public function option($value) {
+		return $this->customSelector("named", array("option", $value));
+	}
+
+	/**
+	 * @param string $value
+	 * @return LocatorBuilderSecondStep
+	 */
+	public function fieldSet($value) {
+		return $this->customSelector("named", array("fieldset", $value));
+	}
+
+	/**
+	 * @param string $value
+	 * @return LocatorBuilderSecondStep
+	 */
+	public function table($value) {
+		return $this->customSelector("named", array("table", $value));
+	}
+
+}
+
+class LocatorBuilderSecondStep {
+
+	/**
+	 * @var string
+	 */
+	private $selector;
+
+	/**
+	 * @var string|array
+	 */
+	private $locator;
+
+	/**
+	 * @param string $selector
+	 * @param string|array $locator
+	 */
+	public function __construct($selector, $locator) {
+		$this->selector = $selector;
+		$this->locator = $locator;
+	}
+
+	/**
+	 * @param Locator|\Behat\Mink\Element\ElementInterface $ancestor
+	 * @return LocatorBuilderThirdStep
+	 */
+	public function descendantOf($ancestor) {
+		return new LocatorBuilderThirdStep($this->selector, $this->locator, $ancestor);
+	}
+
+	/**
+	 * @param string $description
+	 * @return Locator
+	 */
+	public function describedAs($description) {
+		return new Locator($description, $this->selector, $this->locator);
+	}
+
+}
+
+class LocatorBuilderThirdStep {
+
+	/**
+	 * @var string
+	 */
+	private $selector;
+
+	/**
+	 * @var string|array
+	 */
+	private $locator;
+
+	/**
+	 * @var Locator|\Behat\Mink\Element\ElementInterface
+	 */
+	private $ancestor;
+
+	/**
+	 * @param string $selector
+	 * @param string|array $locator
+	 * @param Locator|\Behat\Mink\Element\ElementInterface $ancestor
+	 */
+	public function __construct($selector, $locator, $ancestor) {
+		$this->selector = $selector;
+		$this->locator = $locator;
+		$this->ancestor = $ancestor;
+	}
+
+	/**
+	 * @param string $description
+	 * @return Locator
+	 */
+	public function describedAs($description) {
+		return new Locator($description, $this->selector, $this->locator, $this->ancestor);
+	}
+
+}
diff --git a/tests/acceptance/features/core/NextcloudTestServerContext.php b/tests/acceptance/features/core/NextcloudTestServerContext.php
new file mode 100644
index 00000000000..f8d13a656b9
--- /dev/null
+++ b/tests/acceptance/features/core/NextcloudTestServerContext.php
@@ -0,0 +1,128 @@
+<?php
+
+/**
+ *
+ * @copyright Copyright (c) 2017, Daniel Calviño Sánchez (danxuliu@gmail.com)
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+use Behat\Behat\Context\Context;
+use Behat\Behat\Hook\Scope\BeforeScenarioScope;
+
+/**
+ * Behat context to run each scenario against a clean Nextcloud server.
+ *
+ * Before each scenario is run, this context sets up a fresh Nextcloud server
+ * with predefined data and configuration. Thanks to this every scenario is
+ * independent from the others and they all know the initial state of the
+ * server.
+ *
+ * This context is expected to be used along with RawMinkContext contexts (or
+ * subclasses). As the server address can be different for each scenario, this
+ * context automatically sets the "base_url" parameter of all its sibling
+ * RawMinkContexts; just add NextcloudTestServerContext to the context list of a
+ * suite in "behat.yml".
+ *
+ * The Nextcloud server is provided by an instance of NextcloudTestServerHelper;
+ * its class must be specified when this context is created. By default,
+ * "NextcloudTestServerLocalHelper" is used, although that can be customized
+ * using the "nextcloudTestServerHelper" parameter in "behat.yml". In the same
+ * way, the parameters to be passed to the helper when it is created can be
+ * customized using the "nextcloudTestServerHelperParameters" parameter, which
+ * is an array (without keys) with the value of the parameters in the same order
+ * as in the constructor of the helper class (by default, [ ]).
+ *
+ * Example of custom parameters in "behat.yml":
+ * default:
+ *   suites:
+ *     default:
+ *       contexts:
+ *         - NextcloudTestServerContext:
+ *             nextcloudTestServerHelper: NextcloudTestServerCustomHelper
+ *             nextcloudTestServerHelperParameters:
+ *               - first-parameter-value
+ *               - second-parameter-value
+ */
+class NextcloudTestServerContext implements Context {
+
+	/**
+	 * @var NextcloudTestServerHelper
+	 */
+	private $nextcloudTestServerHelper;
+
+	/**
+	 * Creates a new NextcloudTestServerContext.
+	 *
+	 * @param string $nextcloudTestServerHelper the name of the
+	 *        NextcloudTestServerHelper implementing class to use.
+	 * @param array $nextcloudTestServerHelperParameters the parameters for the
+	 *        constructor of the $nextcloudTestServerHelper class.
+	 */
+	public function __construct($nextcloudTestServerHelper = "NextcloudTestServerLocalHelper",
+								$nextcloudTestServerHelperParameters = [ ]) {
+		$nextcloudTestServerHelperClass = new ReflectionClass($nextcloudTestServerHelper);
+
+		if ($nextcloudTestServerHelperParameters === null) {
+			$nextcloudTestServerHelperParameters = array();
+		}
+
+		$this->nextcloudTestServerHelper = $nextcloudTestServerHelperClass->newInstanceArgs($nextcloudTestServerHelperParameters);
+	}
+
+	/**
+	 * @BeforeScenario
+	 *
+	 * Sets up the Nextcloud test server before each scenario.
+	 *
+	 * Once the Nextcloud test server is set up, the "base_url" parameter of the
+	 * sibling RawMinkContexts is set to the base URL of the Nextcloud test
+	 * server.
+	 *
+	 * @param \Behat\Behat\Hook\Scope\BeforeScenarioScope $scope the
+	 *        BeforeScenario hook scope.
+	 * @throws \Exception if the Nextcloud test server can not be set up or its
+	 *         base URL got.
+	 */
+	public function setUpNextcloudTestServer(BeforeScenarioScope $scope) {
+		$this->nextcloudTestServerHelper->setUp();
+
+		$this->setBaseUrlInSiblingRawMinkContexts($scope, $this->nextcloudTestServerHelper->getBaseUrl());
+	}
+
+	/**
+	 * @AfterScenario
+	 *
+	 * Cleans up the Nextcloud test server after each scenario.
+	 *
+	 * @throws \Exception if the Nextcloud test server can not be cleaned up.
+	 */
+	public function cleanUpNextcloudTestServer() {
+		$this->nextcloudTestServerHelper->cleanUp();
+	}
+
+	private function setBaseUrlInSiblingRawMinkContexts(BeforeScenarioScope $scope, $baseUrl) {
+		$environment = $scope->getEnvironment();
+
+		foreach ($environment->getContexts() as $context) {
+			if ($context instanceof Behat\MinkExtension\Context\RawMinkContext) {
+				$context->setMinkParameter("base_url", $baseUrl);
+			}
+		}
+	}
+
+}
diff --git a/tests/acceptance/features/core/NextcloudTestServerHelper.php b/tests/acceptance/features/core/NextcloudTestServerHelper.php
new file mode 100644
index 00000000000..198d78e3fcb
--- /dev/null
+++ b/tests/acceptance/features/core/NextcloudTestServerHelper.php
@@ -0,0 +1,73 @@
+<?php
+
+/**
+ *
+ * @copyright Copyright (c) 2017, Daniel Calviño Sánchez (danxuliu@gmail.com)
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+/**
+ * Interface for classes that manage a Nextcloud server during acceptance tests.
+ *
+ * A NextcloudTestServerHelper takes care of setting up a Nextcloud server to be
+ * used in acceptance tests through its "setUp" method. It does not matter
+ * wheter the server is a fresh new server just started or an already running
+ * server; in any case, the state of the server must comply with the initial
+ * state expected by the tests (like having performed the Nextcloud installation
+ * or having an admin user with certain password).
+ *
+ * As the IP address and thus its the base URL of the server is not known
+ * beforehand, the NextcloudTestServerHelper must provide it through its
+ * "getBaseUrl" method. Note that this must be the base URL from the point of
+ * view of the Selenium server, which may be a different value than the base URL
+ * from the point of view of the acceptance tests themselves.
+ *
+ * Once the Nextcloud test server is no longer needed the "cleanUp" method will
+ * be called; depending on how the Nextcloud test server was set up it may not
+ * need to do anything.
+ *
+ * All the methods throw an exception if they fail to execute; as, due to the
+ * current use of this interface, it is just a warning for the test runner and
+ * nothing to be explicitly catched a plain base Exception is used.
+ */
+interface NextcloudTestServerHelper {
+
+	/**
+	 * Sets up the Nextcloud test server.
+	 *
+	 * @throws \Exception if the Nextcloud test server can not be set up.
+	 */
+	public function setUp();
+
+	/**
+	 * Cleans up the Nextcloud test server.
+	 *
+	 * @throws \Exception if the Nextcloud test server can not be cleaned up.
+	 */
+	public function cleanUp();
+
+	/**
+	 * Returns the base URL of the Nextcloud test server (from the point of view
+	 * of the Selenium server).
+	 *
+	 * @return string the base URL of the Nextcloud test server.
+	 * @throws \Exception if the base URL can not be determined.
+	 */
+	public function getBaseUrl();
+
+}
diff --git a/tests/acceptance/features/core/NextcloudTestServerLocalHelper.php b/tests/acceptance/features/core/NextcloudTestServerLocalHelper.php
new file mode 100644
index 00000000000..32b5330c61a
--- /dev/null
+++ b/tests/acceptance/features/core/NextcloudTestServerLocalHelper.php
@@ -0,0 +1,134 @@
+<?php
+
+/**
+ *
+ * @copyright Copyright (c) 2017, Daniel Calviño Sánchez (danxuliu@gmail.com)
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+/**
+ * Helper to manage a Nextcloud test server started directly by the acceptance
+ * tests themselves using the PHP built-in web server.
+ *
+ * The Nextcloud test server is executed using the PHP built-in web server
+ * directly from the grandparent directory of the acceptance tests directory
+ * (that is, the root directory of the Nextcloud server); note that the
+ * acceptance tests must be run from the acceptance tests directory. The "setUp"
+ * method resets the Nextcloud server to its initial state and starts it, while
+ * the "cleanUp" method stops it. To be able to reset the Nextcloud server to
+ * its initial state a Git repository must be provided in the root directory of
+ * the Nextcloud server; the last commit in that Git repository must provide the
+ * initial state for the Nextcloud server expected by the acceptance tests.
+ *
+ * The Nextcloud server is available at "127.0.0.1", so it is expected to see
+ * "127.0.0.1" as a trusted domain (which would be the case if it was installed
+ * by running "occ maintenance:install"). The base URL to access the Nextcloud
+ * server can be got from "getBaseUrl".
+ */
+class NextcloudTestServerLocalHelper implements NextcloudTestServerHelper {
+
+	/**
+	 * @var string
+	 */
+	private $phpServerPid;
+
+	/**
+	 * Creates a new NextcloudTestServerLocalHelper.
+	 */
+	public function __construct() {
+		$this->phpServerPid = "";
+	}
+
+	/**
+	 * Sets up the Nextcloud test server.
+	 *
+	 * It resets the Nextcloud test server restoring its last saved Git state
+	 * and then waits for the Nextcloud test server to start again; if the
+	 * server can not be reset or if it does not start again after some time an
+	 * exception is thrown (as it is just a warning for the test runner and
+	 * nothing to be explicitly catched a plain base Exception is used).
+	 *
+	 * @throws \Exception if the Nextcloud test server can not be reset or
+	 *         started again.
+	 */
+	public function setUp() {
+		// Ensure that previous PHP server is not running (as cleanUp may not
+		// have been called).
+		$this->killPhpServer();
+
+		$this->execOrException("cd ../../ && git reset --hard HEAD");
+		$this->execOrException("cd ../../ && git clean -d --force");
+
+		// execOrException is not used because the server is started in the
+		// background, so the command will always succeed even if the server
+		// itself fails.
+		$this->phpServerPid = exec("php -S 127.0.0.1:80 -t ../../ >/dev/null 2>&1 & echo $!");
+
+		$timeout = 60;
+		if (!Utils::waitForServer($this->getBaseUrl(), $timeout)) {
+			throw new Exception("Nextcloud test server could not be started");
+		}
+	}
+
+	/**
+	 * Cleans up the Nextcloud test server.
+	 *
+	 * It kills the running Nextcloud test server, if any.
+	 */
+	public function cleanUp() {
+		$this->killPhpServer();
+	}
+
+	/**
+	 * Returns the base URL of the Nextcloud test server.
+	 *
+	 * @return string the base URL of the Nextcloud test server.
+	 */
+	public function getBaseUrl() {
+		return "http://127.0.0.1/index.php";
+	}
+
+	/**
+	 * Executes the given command, throwing an Exception if it fails.
+	 *
+	 * @param string $command the command to execute.
+	 * @throws \Exception if the command fails to execute.
+	 */
+	private function execOrException($command) {
+		exec($command . " 2>&1", $output, $returnValue);
+		if ($returnValue != 0) {
+			throw new Exception("'$command' could not be executed: " . implode("\n", $output));
+		}
+	}
+
+	/**
+	 * Kills the PHP built-in web server started in setUp, if any.
+	 */
+	private function killPhpServer() {
+		if ($this->phpServerPid == "") {
+			return;
+		}
+
+		// execOrException is not used because the PID may no longer exist when
+		// trying to kill it.
+		exec("kill " . $this->phpServerPid);
+
+		$this->phpServerPid = "";
+	}
+
+}
diff --git a/tests/acceptance/features/core/NoSuchElementException.php b/tests/acceptance/features/core/NoSuchElementException.php
new file mode 100644
index 00000000000..5f8270d2a49
--- /dev/null
+++ b/tests/acceptance/features/core/NoSuchElementException.php
@@ -0,0 +1,37 @@
+<?php
+
+/**
+ *
+ * @copyright Copyright (c) 2017, Daniel Calviño Sánchez (danxuliu@gmail.com)
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+/**
+ * Exception to signal that the element looked for could not be found.
+ */
+class NoSuchElementException extends \Exception {
+
+	/**
+	 * @param string $message
+	 * @param null|\Exception $previous
+	 */
+	public function __construct($message, \Exception $previous = null) {
+		parent::__construct($message, 0, $previous);
+	}
+
+}
diff --git a/tests/acceptance/features/core/Utils.php b/tests/acceptance/features/core/Utils.php
new file mode 100644
index 00000000000..86b7515e4c6
--- /dev/null
+++ b/tests/acceptance/features/core/Utils.php
@@ -0,0 +1,90 @@
+<?php
+
+/**
+ *
+ * @copyright Copyright (c) 2017, Daniel Calviño Sánchez (danxuliu@gmail.com)
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+class Utils {
+
+	/**
+	 * Waits at most $timeout seconds for the given condition to be true,
+	 * checking it again every $timeoutStep seconds.
+	 *
+	 * Note that the timeout is no longer taken into account when a condition is
+	 * met; that is, true will be returned if the condition is met before the
+	 * timeout expires, but also if it is met exactly when the timeout expires.
+	 * For example, even if the timeout is set to 0, the condition will be
+	 * checked at least once, and true will be returned in that case if the
+	 * condition was met.
+	 *
+	 * @param \Closure $conditionCallback the condition to wait for, as a
+	 *        function that returns a boolean.
+	 * @param float $timeout the number of seconds (decimals allowed) to wait at
+	 *        most for the condition to be true.
+	 * @param float $timeoutStep the number of seconds (decimals allowed) to
+	 *        wait before checking the condition again.
+	 * @return boolean true if the condition is met before (or exactly when) the
+	 *         timeout expires, false otherwise.
+	 */
+	public static function waitFor($conditionCallback, $timeout, $timeoutStep) {
+		$elapsedTime = 0;
+		$conditionMet = false;
+
+		while (!($conditionMet = $conditionCallback()) && $elapsedTime < $timeout) {
+			usleep($timeoutStep * 1000000);
+
+			$elapsedTime += $timeoutStep;
+		}
+
+		return $conditionMet;
+	}
+
+	/**
+	 * Waits at most $timeout seconds for the server at the given URL to be up,
+	 * checking it again every $timeoutStep seconds.
+	 *
+	 * Note that it does not verify whether the URL returns a valid HTTP status
+	 * or not; it simply checks that the server at the given URL is accessible.
+	 *
+	 * @param string $url the URL for the server to check.
+	 * @param float $timeout the number of seconds (decimals allowed) to wait at
+	 *        most for the server.
+	 * @param float $timeoutStep the number of seconds (decimals allowed) to
+	 *        wait before checking the server again; by default, 0.5 seconds.
+	 * @return boolean true if the server was found, false otherwise.
+	 */
+	public static function waitForServer($url, $timeout, $timeoutStep = 0.5) {
+		$isServerUpCallback = function() use ($url) {
+			$curlHandle = curl_init($url);
+
+			// Returning the transfer as the result of curl_exec prevents the
+			// transfer from being written to the output.
+			curl_setopt($curlHandle, CURLOPT_RETURNTRANSFER, true);
+
+			$transfer = curl_exec($curlHandle);
+
+			curl_close($curlHandle);
+
+			return $transfer !== false;
+		};
+		return self::waitFor($isServerUpCallback, $timeout, $timeoutStep);
+	}
+
+}
diff --git a/tests/acceptance/features/login.feature b/tests/acceptance/features/login.feature
new file mode 100644
index 00000000000..e414209206e
--- /dev/null
+++ b/tests/acceptance/features/login.feature
@@ -0,0 +1,47 @@
+Feature: login
+
+  Scenario: log in with valid user and password
+    Given I visit the Home page
+    When I log in with user user0 and password 123456acb
+    Then I see that the current page is the Files app
+
+  Scenario: try to log in with valid user and invalid password
+    Given I visit the Home page
+    When I log in with user user0 and password 654321
+    Then I see that the current page is the Login page
+    And I see that a wrong password message is shown
+
+  Scenario: log in with valid user and invalid password once fixed by admin
+    Given I act as John
+    And I can not log in with user user0 and password 654231
+    When I act as Jane
+    And I am logged in as the admin
+    And I open the User settings
+    And I set the password for user0 to 654321
+    And I see that the "Password successfully changed" notification is shown
+    And I act as John
+    And I log in with user user0 and password 654321
+    Then I see that the current page is the Files app
+
+  Scenario: try to log in with invalid user
+    Given I visit the Home page
+    When I log in with user unknownUser and password 123456acb
+    Then I see that the current page is the Login page
+    And I see that a wrong password message is shown
+
+  Scenario: log in with invalid user once fixed by admin
+    Given I act as John
+    And I can not log in with user unknownUser and password 123456acb
+    When I act as Jane
+    And I am logged in as the admin
+    And I open the User settings
+    And I create user unknownUser with password 123456acb
+    And I see that the list of users contains the user unknownUser
+    And I act as John
+    And I log in with user unknownUser and password 123456acb
+    Then I see that the current page is the Files app
+
+  Scenario: log out
+    Given I am logged in
+    When I log out
+    Then I see that the current page is the Login page
diff --git a/tests/acceptance/installAndConfigureServer.sh b/tests/acceptance/installAndConfigureServer.sh
new file mode 100755
index 00000000000..2fbdf821f77
--- /dev/null
+++ b/tests/acceptance/installAndConfigureServer.sh
@@ -0,0 +1,30 @@
+#!/bin/bash
+
+# @copyright Copyright (c) 2017, Daniel Calviño Sánchez (danxuliu@gmail.com)
+#
+# @license GNU AGPL version 3 or any later version
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Affero General Public License as
+# published by the Free Software Foundation, either version 3 of the
+# License, or (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU Affero General Public License for more details.
+#
+# You should have received a copy of the GNU Affero General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+# Helper script to install and configure the Nextcloud server as expected by the
+# acceptance tests.
+#
+# This script is not meant to be called manually; it is called when needed by
+# the acceptance tests launchers.
+
+set -o errexit
+
+php occ maintenance:install --admin-pass=admin
+
+OC_PASS=123456acb php occ user:add --password-from-env user0
diff --git a/tests/acceptance/run-local.sh b/tests/acceptance/run-local.sh
new file mode 100755
index 00000000000..ee7a4e6455c
--- /dev/null
+++ b/tests/acceptance/run-local.sh
@@ -0,0 +1,69 @@
+#!/usr/bin/env bash
+
+# @copyright Copyright (c) 2017, Daniel Calviño Sánchez (danxuliu@gmail.com)
+#
+# @license GNU AGPL version 3 or any later version
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Affero General Public License as
+# published by the Free Software Foundation, either version 3 of the
+# License, or (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU Affero General Public License for more details.
+#
+# You should have received a copy of the GNU Affero General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+# Helper script to run the acceptance tests, which test a running Nextcloud
+# instance from the point of view of a real user, configured to start the
+# Nextcloud server themselves and from their grandparent directory.
+#
+# The acceptance tests are written in Behat so, besides running the tests, this
+# script installs Behat, its dependencies, and some related packages in the
+# "vendor" subdirectory of the acceptance tests. The acceptance tests expect
+# that the last commit in the Git repository provides the default state of the
+# Nextcloud server, so the script installs the Nextcloud server and saves a
+# snapshot of the whole grandparent directory (no .gitignore file is used) in
+# the Git repository. Finally, the acceptance tests also use the Selenium server
+# to control a web browser, so this script waits for the Selenium server
+# (which should have been started before executing this script) to be ready
+# before running the tests.
+
+# Exit immediately on errors.
+set -o errexit
+
+# Ensure working directory is script directory, as some actions (like installing
+# Behat through Composer or running Behat) expect that.
+cd "$(dirname $0)"
+
+# Safety parameter to prevent executing this script by mistake and messing with
+# the Git repository.
+if [ "$1" != "allow-git-repository-modifications" ]; then
+	echo "To run the acceptance tests use \"run.sh\" instead"
+
+	exit 1
+fi
+
+SCENARIO_TO_RUN=$2
+
+composer install
+
+cd ../../
+
+echo "Installing and configuring Nextcloud server"
+tests/acceptance/installAndConfigureServer.sh
+
+echo "Saving the default state so acceptance tests can reset to it"
+find . -name ".gitignore" -exec rm --force {} \;
+git add --all && echo 'Default state' | git -c user.name='John Doe' -c user.email='john@doe.org' commit --quiet --file=-
+
+cd tests/acceptance
+
+# Ensure that the Selenium server is ready before running the tests.
+echo "Waiting for Selenium"
+timeout 60s bash -c "while ! curl 127.0.0.1:4444 >/dev/null 2>&1; do sleep 1; done"
+
+vendor/bin/behat $SCENARIO_TO_RUN
diff --git a/tests/acceptance/run.sh b/tests/acceptance/run.sh
new file mode 100755
index 00000000000..f9711cbb404
--- /dev/null
+++ b/tests/acceptance/run.sh
@@ -0,0 +1,178 @@
+#!/usr/bin/env bash
+
+# @copyright Copyright (c) 2017, Daniel Calviño Sánchez (danxuliu@gmail.com)
+#
+# @license GNU AGPL version 3 or any later version
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Affero General Public License as
+# published by the Free Software Foundation, either version 3 of the
+# License, or (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU Affero General Public License for more details.
+#
+# You should have received a copy of the GNU Affero General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+# Helper script to run the acceptance tests, which test a running Nextcloud
+# instance from the point of view of a real user.
+#
+# The acceptance tests are run in its own Docker container; the grandparent
+# directory of the acceptance tests directory (that is, the root directory of
+# the Nextcloud server) is copied to the container and the acceptance tests are
+# run inside it. Once the tests end the container is stopped. The acceptance
+# tests also use the Selenium server to control a web browser, so the Selenium
+# server is also launched before the tests start in its own Docker container (it
+# will be stopped automatically too once the tests end).
+#
+# To perform its job, the script requires the "docker" command to be available.
+#
+# The Docker Command Line Interface (the "docker" command) requires special
+# permissions to talk to the Docker daemon, and those permissions are typically
+# available only to the root user. Please see the Docker documentation to find
+# out how to give access to a regular user to the Docker daemon:
+# https://docs.docker.com/engine/installation/linux/linux-postinstall/
+#
+# Note, however, that being able to communicate with the Docker daemon is the
+# same as being able to get root privileges for the system. Therefore, you must
+# give access to the Docker daemon (and thus run this script as) ONLY to trusted
+# and secure users:
+# https://docs.docker.com/engine/security/security/#docker-daemon-attack-surface
+#
+# Finally, take into account that this script will automatically remove the
+# Docker containers named "selenium-nextcloud-local-test-acceptance" and
+# "nextcloud-local-test-acceptance", even if the script did not create them
+# (probably you will not have containers nor images with those names, but just
+# in case).
+
+# Launches the Selenium server in a Docker container.
+#
+# The acceptance tests use Firefox by default but, unfortunately, Firefox >= 48
+# does not provide yet the same level of support as earlier versions for certain
+# features related to automated testing. Therefore, the Docker image used is not
+# the latest one, but an older version known to work.
+#
+# The acceptance tests expect the Selenium server to be accessible at
+# "127.0.0.1:4444"; as the Selenium server container and the container in which
+# the acceptance tests are run share the same network nothing else needs to be
+# done for the acceptance tests to access the Selenium server and for the
+# Selenium server to access the Nextcloud server. However, in order to ensure
+# from this script that the Selenium server was started the 4444 port of its
+# container is mapped to the 4444 port of the host.
+#
+# Besides the Selenium server, the Docker image also provides a VNC server, so
+# the 5900 port of the container is also mapped to the 5900 port of the host.
+#
+# The Docker container started here will be automatically stopped when the
+# script exits (see cleanUp). If the Selenium server can not be started then the
+# script will be exited immediately with an error state; the most common cause
+# for the Selenium server to fail to start is that another server is already
+# using the mapped ports in the host.
+#
+# As the web browser is run inside the Docker container it is not visible by
+# default. However, it can be viewed using VNC (for example,
+# "vncviewer 127.0.0.1:5900"); when asked for the password use "secret".
+function prepareSelenium() {
+	SELENIUM_CONTAINER=selenium-nextcloud-local-test-acceptance
+
+	echo "Starting Selenium server"
+	docker run --detach --name=$SELENIUM_CONTAINER --publish 4444:4444 --publish 5900:5900 selenium/standalone-firefox-debug:2.53.1-beryllium
+
+	echo "Waiting for Selenium server to be ready"
+	if ! timeout 10s bash -c "while ! curl 127.0.0.1:4444 >/dev/null 2>&1; do sleep 1; done"; then
+		echo "Could not start Selenium server; running" \
+		     "\"docker run --rm --publish 4444:4444 --publish 5900:5900 selenium/standalone-firefox-debug:2.53.1-beryllium\"" \
+		     "could give you a hint of the problem"
+
+		exit 1
+	fi
+}
+
+# Creates a Docker container to run both the acceptance tests and the Nextcloud
+# server used by them.
+#
+# This function starts a Docker container with a copy the Nextcloud code from
+# the grandparent directory, although ignoring any configuration or data that it
+# may provide (for example, if that directory was used directly to deploy a
+# Nextcloud instance in a web server). As the Nextcloud code is copied to the
+# container instead of referenced the original code can be modified while the
+# acceptance tests are running without interfering in them.
+function prepareDocker() {
+	NEXTCLOUD_LOCAL_CONTAINER=nextcloud-local-test-acceptance
+
+	echo "Starting the Nextcloud container"
+	# As the Nextcloud server container uses the network of the Selenium server
+	# container the Nextcloud server can be accessed at "127.0.0.1" from the
+	# Selenium server.
+	# The container exits immediately if no command is given, so a Bash session
+	# is created to prevent that.
+	docker run --detach --name=$NEXTCLOUD_LOCAL_CONTAINER --network=container:$SELENIUM_CONTAINER --interactive --tty nextcloudci/php7.0:php7.0-7 bash
+
+	# Use the $TMPDIR or, if not set, fall back to /tmp.
+	NEXTCLOUD_LOCAL_TAR="$(mktemp --tmpdir="${TMPDIR:-/tmp}" --suffix=.tar nextcloud-local-XXXXXXXXXX)"
+
+	# Setting the user and group of files in the tar would be superfluous, as
+	# "docker cp" does not take them into account (the extracted files are set
+	# to root).
+	echo "Copying local Git working directory of Nextcloud to the container"
+	tar --create --file="$NEXTCLOUD_LOCAL_TAR" --exclude=".git" --exclude="./build" --exclude="./config/config.php" --exclude="./data" --exclude="./data-autotest" --exclude="./tests" --directory=../../ .
+	tar --append --file="$NEXTCLOUD_LOCAL_TAR" --directory=../../ tests/acceptance/
+
+	docker exec $NEXTCLOUD_LOCAL_CONTAINER mkdir /nextcloud
+	docker cp - $NEXTCLOUD_LOCAL_CONTAINER:/nextcloud/ < "$NEXTCLOUD_LOCAL_TAR"
+
+	# run-local.sh expects a Git repository to be available in the root of the
+	# Nextcloud server, but it was excluded when the Git working directory was
+	# copied to the container to avoid copying the large and unneeded history of
+	# the repository.
+	docker exec $NEXTCLOUD_LOCAL_CONTAINER bash -c "cd nextcloud && git init"
+}
+
+# Removes/stops temporal elements created/started by this script.
+function cleanUp() {
+	# Disable (yes, "+" disables) exiting immediately on errors to ensure that
+	# all the cleanup commands are executed (well, no errors should occur during
+	# the cleanup anyway, but just in case).
+	set +o errexit
+
+	echo "Cleaning up"
+
+	if [ -f "$NEXTCLOUD_LOCAL_TAR" ]; then
+		echo "Removing $NEXTCLOUD_LOCAL_TAR"
+	    rm $NEXTCLOUD_LOCAL_TAR
+	fi
+
+	# The name filter must be specified as "^/XXX$" to get an exact match; using
+	# just "XXX" would match every name that contained "XXX".
+	if [ -n "$(docker ps --all --quiet --filter name="^/$NEXTCLOUD_LOCAL_CONTAINER$")" ]; then
+		echo "Removing Docker container $NEXTCLOUD_LOCAL_CONTAINER"
+		docker rm --volumes --force $NEXTCLOUD_LOCAL_CONTAINER
+	fi
+
+	if [ -n "$(docker ps --all --quiet --filter name="^/$SELENIUM_CONTAINER$")" ]; then
+		echo "Removing Docker container $SELENIUM_CONTAINER"
+		docker rm --volumes --force $SELENIUM_CONTAINER
+	fi
+}
+
+# Exit immediately on errors.
+set -o errexit
+
+# Execute cleanUp when the script exits, either normally or due to an error.
+trap cleanUp EXIT
+
+# Ensure working directory is script directory, as some actions (like copying
+# the Git working directory to the container) expect that.
+cd "$(dirname $0)"
+
+# If no parameter is provided to this script all the acceptance tests are run.
+SCENARIO_TO_RUN=$1
+
+prepareSelenium
+prepareDocker
+
+echo "Running tests"
+docker exec $NEXTCLOUD_LOCAL_CONTAINER bash -c "cd nextcloud && tests/acceptance/run-local.sh allow-git-repository-modifications $SCENARIO_TO_RUN"