diff -u b/core/tests/Drupal/Tests/Core/Asset/LibraryDiscoveryParserTest.php b/core/tests/Drupal/Tests/Core/Asset/LibraryDiscoveryParserTest.php
--- b/core/tests/Drupal/Tests/Core/Asset/LibraryDiscoveryParserTest.php
+++ b/core/tests/Drupal/Tests/Core/Asset/LibraryDiscoveryParserTest.php
@@ -172,7 +172,7 @@
   }
 
   /**
-   * Tests that an exception is thrown when no CSS/JS/setting is specified.
+   * Tests that no exception is thrown when only dependencies are specified.
    *
    * @covers ::buildByExtension
    */
@@ -191,7 +191,7 @@
   }
 
   /**
-   * Tests that an exception is thrown when no CSS/JS/setting is specified.
+   * Tests that an exception is thrown with only the version property specified.
    *
    * @covers ::buildByExtension
    */