1 files changed, 120 insertions, 0 deletions
diff --git a/tests/phpunit/includes/language/MessageParserTest.php b/tests/phpunit/includes/language/MessageParserTest.php
new file mode 100644
index 000000000000..eeb980598e0d
--- /dev/null
+++ b/tests/phpunit/includes/language/MessageParserTest.php
@@ -0,0 +1,120 @@
+<?php
+
+use MediaWiki\DAO\WikiAwareEntity;
+use MediaWiki\Language\RawMessage;
+use MediaWiki\Page\PageIdentityValue;
+
+/**
+ * @covers MediaWiki\Language\MessageParser
+ */
+class MessageParserTest extends MediaWikiIntegrationTestCase {
+
+	public function testNestedMessageParse() {
+		$msgOuter = ( new RawMessage( '[[Link|{{#language:}}]]' ) )
+			->inLanguage( 'outer' )
+			->page( new PageIdentityValue( 1, NS_MAIN, 'Link', PageIdentityValue::LOCAL ) );
+
+		// T372891: Allow nested message parsing
+		// Any hook from Linker or LinkRenderer will do for this test, but this one is the simplest
+		$this->setTemporaryHook( 'SelfLinkBegin', static function ( $nt, &$html, &$trail, &$prefix, &$ret ) {
+			$msgInner = ( new RawMessage( '{{#language:}}' ) )->inLanguage( 'inner' );
+			$html .= $msgInner->escaped();
+		} );
+
+		$this->assertEquals( '<a class="mw-selflink selflink">outerinner</a>', $msgOuter->parse() );
+	}
+
+	public static function provideTransform() {
+		return [
+			[
+				'test',
+				[],
+				'test'
+			],
+			[
+				'{{PLURAL:21|one|more}}',
+				[ 'lang' => 'en' ],
+				'more'
+			],
+			[
+				'{{PLURAL:21|one|more}}',
+				[ 'lang' => 'be' ],
+				'one'
+			],
+			[
+				'{{PAGENAME}}',
+				[],
+				'Badtitle/MessageParser'
+			],
+			[
+				'{{PAGENAME}}',
+				[ 'page' => 'Main_Page' ],
+				'Main Page',
+			]
+		];
+	}
+
+	/**
+	 * @dataProvider provideTransform
+	 */
+	public function testTransform( $input, $options, $expected ) {
+		$messageParser = $this->getServiceContainer()->getMessageParser();
+		$result = $messageParser->transform(
+			$input,
+			$options['interface'] ?? true,
+			$options['lang'] ?? null,
+			$this->makePage( $options['page'] ?? null )
+		);
+		$this->assertSame( $expected, $result );
+	}
+
+	private function makePage( $title ) {
+		return $title
+			? new PageIdentityValue( 1, NS_MAIN, $title, WikiAwareEntity::LOCAL )
+			: null;
+	}
+
+	public static function provideParse() {
+		return [
+			[
+				'test',
+				[],
+				'test'
+			],
+			[
+				'* Bullet',
+				[],
+				'<ul><li>Bullet</li></ul>'
+			],
+			[
+				'* Asterisk',
+				[ 'lineStart' => false ],
+				'* Asterisk'
+			],
+			[
+				'{{#bcp47:}}',
+				[ 'lang' => 'fr' ],
+				'fr'
+			],
+		];
+	}
+
+	/**
+	 * @dataProvider provideParse
+	 * @param string $input
+	 * @param array $options
+	 * @param string $expected
+	 */
+	public function testParse( $input, $options, $expected ) {
+		$messageParser = $this->getServiceContainer()->getMessageParser();
+		$parserOutput = $messageParser->parse(
+			$input,
+			$this->makePage( $options['page'] ?? null ),
+			$options['lineStart'] ?? true,
+			$options['interface'] ?? true,
+			$options['lang'] ?? null
+		);
+		$result = Parser::stripOuterParagraph( $parserOutput->getContentHolderText() );
+		$this->assertSame( $expected, $result );
+	}
+}