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diff --git a/www/wiki/tests/phpunit/includes/composer/ComposerVersionNormalizerTest.php b/www/wiki/tests/phpunit/includes/composer/ComposerVersionNormalizerTest.php
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+<?php
+
+/**
+ * @covers ComposerVersionNormalizer
+ *
+ * @group ComposerHooks
+ *
+ * @author Jeroen De Dauw < jeroendedauw@gmail.com >
+ */
+class ComposerVersionNormalizerTest extends PHPUnit\Framework\TestCase {
+
+	use MediaWikiCoversValidator;
+	use PHPUnit4And6Compat;
+
+	/**
+	 * @dataProvider nonStringProvider
+	 */
+	public function testGivenNonString_normalizeThrowsInvalidArgumentException( $nonString ) {
+		$normalizer = new ComposerVersionNormalizer();
+
+		$this->setExpectedException( InvalidArgumentException::class );
+		$normalizer->normalizeSuffix( $nonString );
+	}
+
+	public function nonStringProvider() {
+		return [
+			[ null ],
+			[ 42 ],
+			[ [] ],
+			[ new stdClass() ],
+			[ true ],
+		];
+	}
+
+	/**
+	 * @dataProvider simpleVersionProvider
+	 */
+	public function testGivenSimpleVersion_normalizeSuffixReturnsAsIs( $simpleVersion ) {
+		$this->assertRemainsUnchanged( $simpleVersion );
+	}
+
+	protected function assertRemainsUnchanged( $version ) {
+		$normalizer = new ComposerVersionNormalizer();
+
+		$this->assertEquals(
+			$version,
+			$normalizer->normalizeSuffix( $version )
+		);
+	}
+
+	public function simpleVersionProvider() {
+		return [
+			[ '1.22.0' ],
+			[ '1.19.2' ],
+			[ '1.19.2.0' ],
+			[ '1.9' ],
+			[ '123.321.456.654' ],
+		];
+	}
+
+	/**
+	 * @dataProvider complexVersionProvider
+	 */
+	public function testGivenComplexVersionWithoutDash_normalizeSuffixAddsDash(
+		$withoutDash, $withDash
+	) {
+		$normalizer = new ComposerVersionNormalizer();
+
+		$this->assertEquals(
+			$withDash,
+			$normalizer->normalizeSuffix( $withoutDash )
+		);
+	}
+
+	public function complexVersionProvider() {
+		return [
+			[ '1.22.0alpha', '1.22.0-alpha' ],
+			[ '1.22.0RC', '1.22.0-RC' ],
+			[ '1.19beta', '1.19-beta' ],
+			[ '1.9RC4', '1.9-RC4' ],
+			[ '1.9.1.2RC4', '1.9.1.2-RC4' ],
+			[ '1.9.1.2RC', '1.9.1.2-RC' ],
+			[ '123.321.456.654RC9001', '123.321.456.654-RC9001' ],
+		];
+	}
+
+	/**
+	 * @dataProvider complexVersionProvider
+	 */
+	public function testGivenComplexVersionWithDash_normalizeSuffixReturnsAsIs(
+		$withoutDash, $withDash
+	) {
+		$this->assertRemainsUnchanged( $withDash );
+	}
+
+	/**
+	 * @dataProvider fourLevelVersionsProvider
+	 */
+	public function testGivenFourLevels_levelCountNormalizationDoesNothing( $version ) {
+		$normalizer = new ComposerVersionNormalizer();
+
+		$this->assertEquals(
+			$version,
+			$normalizer->normalizeLevelCount( $version )
+		);
+	}
+
+	public function fourLevelVersionsProvider() {
+		return [
+			[ '1.22.0.0' ],
+			[ '1.19.2.4' ],
+			[ '1.19.2.0' ],
+			[ '1.9.0.1' ],
+			[ '123.321.456.654' ],
+			[ '123.321.456.654RC4' ],
+			[ '123.321.456.654-RC4' ],
+		];
+	}
+
+	/**
+	 * @dataProvider levelNormalizationProvider
+	 */
+	public function testGivenFewerLevels_levelCountNormalizationEnsuresFourLevels(
+		$expected, $version
+	) {
+		$normalizer = new ComposerVersionNormalizer();
+
+		$this->assertEquals(
+			$expected,
+			$normalizer->normalizeLevelCount( $version )
+		);
+	}
+
+	public function levelNormalizationProvider() {
+		return [
+			[ '1.22.0.0', '1.22' ],
+			[ '1.22.0.0', '1.22.0' ],
+			[ '1.19.2.0', '1.19.2' ],
+			[ '12345.0.0.0', '12345' ],
+			[ '12345.0.0.0-RC4', '12345-RC4' ],
+			[ '12345.0.0.0-alpha', '12345-alpha' ],
+		];
+	}
+
+	/**
+	 * @dataProvider invalidVersionProvider
+	 */
+	public function testGivenInvalidVersion_normalizeSuffixReturnsAsIs( $invalidVersion ) {
+		$this->assertRemainsUnchanged( $invalidVersion );
+	}
+
+	public function invalidVersionProvider() {
+		return [
+			[ '1.221-a' ],
+			[ '1.221-' ],
+			[ '1.22rc4a' ],
+			[ 'a1.22rc' ],
+			[ '.1.22rc' ],
+			[ 'a' ],
+			[ 'alpha42' ],
+		];
+	}
+}