diff --git a/tests/phpunit/PygmentizeTest.php b/tests/phpunit/PygmentizeTest.php
index 2d70915b..ff527adf 100644
--- a/tests/phpunit/PygmentizeTest.php
+++ b/tests/phpunit/PygmentizeTest.php
@@ -2,6 +2,7 @@
 
 use MediaWiki\MainConfigNames;
 use MediaWiki\Shell\CommandFactory;
+use MediaWiki\SyntaxHighlight\Pygmentize;
 use MediaWiki\SyntaxHighlight\SyntaxHighlight;
 use Shellbox\Command\BoxedCommand;
 use Shellbox\Command\BoxedResult;
@@ -75,4 +76,13 @@ class PygmentizeTest extends MediaWikiIntegrationTestCase {
 		$status = SyntaxHighlight::highlight( '"example"', 'json' );
 		$this->assertSame( $expect, $status->getValue() );
 	}
+
+	public function testFetchGeneratedCss() {
+		// Check that pygments.generated.css was generated by running the maintenance script
+		$file = __DIR__ . '/../../modules/pygments.generated.css';
+		$fileContent = file_get_contents( $file );
+
+		$generatedCss = "/* Stylesheet generated by updateCSS.php */\n" . Pygmentize::fetchGeneratedCSS();
+		$this->assertEquals( $generatedCss, $fileContent );
+	}
 }