1 files changed, 56 insertions, 0 deletions
diff --git a/tests/unit/Service/EncodingServiceTest.php b/tests/unit/Service/EncodingServiceTest.php
new file mode 100644
index 000000000..8458aaae9
--- /dev/null
+++ b/tests/unit/Service/EncodingServiceTest.php
@@ -0,0 +1,56 @@
+<?php
+
+namespace OCA\Text\Service;
+
+use Test\TestCase;
+
+class LabelServiceTest extends TestCase {
+	private $encodingService;
+
+	protected function setUp(): void {
+		parent::setUp();
+		$this->encodingService = new EncodingService();
+	}
+
+	/**
+	 * Attempt to decode the file using the default decoding order.
+	 * For files with encodings not included in the COMMON_ENCODINGS array encoding to UTF-8 will fail.
+	 * @dataProvider dataFileEncodings
+	 */
+	public function testDefault(string $file, string $encoding) {
+		$utf8_string = $this->encodingService->encodeToUtf8(file_get_contents($file));
+
+		// If encoding is not part of the default encodings we can expect it to fail
+		// It might still succeed because encoding detection is not precise.
+		if (!$utf8_string && !in_array($encoding, EncodingService::COMMON_ENCODINGS, true)) {
+			return;
+		}
+
+		$this->assertNotNull($utf8_string);
+		$this->assertNotFalse(mb_detect_encoding($utf8_string, 'UTF-8', true));
+	}
+
+	/**
+	 * Includes the encoding of the file in the detection order config value.
+	 * This means that all files should be successfully encoded to UTF-8.
+	 * @dataProvider dataFileEncodings
+	 */
+	public function testCustomOrder(string $file, string $encoding) {
+		$original_order = mb_detect_order();
+		$this->assertNotFalse(mb_detect_order($encoding));
+
+		$utf8_string = $this->encodingService->encodeToUtf8(file_get_contents($file));
+		$this->assertNotNull($utf8_string);
+		$this->assertNotFalse(mb_detect_encoding($utf8_string, 'UTF-8', true));
+
+		mb_detect_order($original_order);
+	}
+
+	public function dataFileEncodings(): array {
+		return [
+			['./tests/data/iso-8859.txt', 'ISO-8859-1'],
+			['./tests/data/big5.txt', 'BIG-5'],
+			['./tests/data/gbk.txt', 'GBK']
+		];
+	}
+}