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diff --git a/www/wiki/tests/phpunit/includes/cache/LocalisationCacheTest.php b/www/wiki/tests/phpunit/includes/cache/LocalisationCacheTest.php
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+++ b/www/wiki/tests/phpunit/includes/cache/LocalisationCacheTest.php
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+<?php
+/**
+ * @group Database
+ * @group Cache
+ * @covers LocalisationCache
+ * @author Niklas Laxström
+ */
+class LocalisationCacheTest extends MediaWikiTestCase {
+	protected function setUp() {
+		parent::setUp();
+		$this->setMwGlobals( [
+			'wgExtensionMessagesFiles' => [],
+			'wgHooks' => [],
+		] );
+	}
+
+	/**
+	 * @return LocalisationCache
+	 */
+	protected function getMockLocalisationCache() {
+		global $IP;
+		$lc = $this->getMockBuilder( \LocalisationCache::class )
+			->setConstructorArgs( [ [ 'store' => 'detect' ] ] )
+			->setMethods( [ 'getMessagesDirs' ] )
+			->getMock();
+		$lc->expects( $this->any() )->method( 'getMessagesDirs' )
+			->will( $this->returnValue(
+				[ "$IP/tests/phpunit/data/localisationcache" ]
+			) );
+
+		return $lc;
+	}
+
+	public function testPuralRulesFallback() {
+		$cache = $this->getMockLocalisationCache();
+
+		$this->assertEquals(
+			$cache->getItem( 'ar', 'pluralRules' ),
+			$cache->getItem( 'arz', 'pluralRules' ),
+			'arz plural rules (undefined) fallback to ar (defined)'
+		);
+
+		$this->assertEquals(
+			$cache->getItem( 'ar', 'compiledPluralRules' ),
+			$cache->getItem( 'arz', 'compiledPluralRules' ),
+			'arz compiled plural rules (undefined) fallback to ar (defined)'
+		);
+
+		$this->assertNotEquals(
+			$cache->getItem( 'ksh', 'pluralRules' ),
+			$cache->getItem( 'de', 'pluralRules' ),
+			'ksh plural rules (defined) dont fallback to de (defined)'
+		);
+
+		$this->assertNotEquals(
+			$cache->getItem( 'ksh', 'compiledPluralRules' ),
+			$cache->getItem( 'de', 'compiledPluralRules' ),
+			'ksh compiled plural rules (defined) dont fallback to de (defined)'
+		);
+	}
+
+	public function testRecacheFallbacks() {
+		$lc = $this->getMockLocalisationCache();
+		$lc->recache( 'ba' );
+		$this->assertEquals(
+			[
+				'present-ba' => 'ba',
+				'present-ru' => 'ru',
+				'present-en' => 'en',
+			],
+			$lc->getItem( 'ba', 'messages' ),
+			'Fallbacks are only used to fill missing data'
+		);
+	}
+
+	public function testRecacheFallbacksWithHooks() {
+		// Use hook to provide updates for messages. This is what the
+		// LocalisationUpdate extension does. See T70781.
+		$this->mergeMwGlobalArrayValue( 'wgHooks', [
+			'LocalisationCacheRecacheFallback' => [
+				function (
+					LocalisationCache $lc,
+					$code,
+					array &$cache
+				) {
+					if ( $code === 'ru' ) {
+						$cache['messages']['present-ba'] = 'ru-override';
+						$cache['messages']['present-ru'] = 'ru-override';
+						$cache['messages']['present-en'] = 'ru-override';
+					}
+				}
+			]
+		] );
+
+		$lc = $this->getMockLocalisationCache();
+		$lc->recache( 'ba' );
+		$this->assertEquals(
+			[
+				'present-ba' => 'ba',
+				'present-ru' => 'ru-override',
+				'present-en' => 'ru-override',
+			],
+			$lc->getItem( 'ba', 'messages' ),
+			'Updates provided by hooks follow the normal fallback order.'
+		);
+	}
+}