modules

Closes #3498302

core/modules/big_pipe/tests/src/Unit/Render/FiberPlaceholderTest.php

@@ -110,6 +110,9 @@ public function testLongPlaceholderFiberSuspendingLoop(): void {
 
 }
 
+/**
+ * Test class for testing fiber placeholders.
+ */
 class TurtleLazyBuilder implements TrustedCallbackInterface {
 
   /**