tests: Cover CodeEditorHooks

Change-Id: I8a094d14347bb58850b7f864320f30420b18460f

tests/phpunit/TemplateStylesCodeEditorHooksTest.php

@@ -0,0 +1,44 @@
+<?php
+
+use MediaWiki\Extension\TemplateStyles\CodeEditorHooks;
+use MediaWiki\Title\Title;
+
+/**
+ * @group TemplateStyles
+ * @covers \MediaWiki\Extension\TemplateStyles\CodeEditorHooks
+ */
+class TemplateStylesCodeEditorHooksTest extends MediaWikiLangTestCase {
+
+	protected function setUp(): void {
+		parent::setUp();
+
+		$this->markTestSkippedIfExtensionNotLoaded( 'CodeEditor' );
+	}
+
+	/**
+	 * @dataProvider provideOnCodeEditorGetPageLanguage
+	 */
+	public function testOnCodeEditorGetPageLanguage( $useCodeEditor, $model, $expect ) {
+		$this->setMwGlobals( [
+			'wgTemplateStylesUseCodeEditor' => $useCodeEditor,
+		] );
+
+		$title = Title::makeTitle( NS_TEMPLATE, 'Test.css' );
+		$lang = 'unchanged';
+		$ret = ( new CodeEditorHooks )->onCodeEditorGetPageLanguage(
+			$title, $lang, $model, 'text/x-whatever'
+		);
+		$this->assertSame( !$expect, $ret );
+		$this->assertSame( $expect ? 'css' : 'unchanged', $lang );
+	}
+
+	public static function provideOnCodeEditorGetPageLanguage() {
+		return [
+			[ true, 'wikitext', false ],
+			[ true, 'css', false ],
+			[ true, 'sanitized-css', true ],
+			[ false, 'sanitized-css', false ],
+		];
+	}
+
+}