diff --git a/core/tests/Drupal/Tests/Core/Utility/CallableResolverTest.php b/core/tests/Drupal/Tests/Core/Utility/CallableResolverTest.php
index aad0be5fe6..aec99cd0d7 100644
--- a/core/tests/Drupal/Tests/Core/Utility/CallableResolverTest.php
+++ b/core/tests/Drupal/Tests/Core/Utility/CallableResolverTest.php
@@ -166,8 +166,14 @@ public static function staticMethod($suffix) {
    *
    * @return string
    *   A test string.
+   *
+   * @throws \Exception
+   *   Throws an exception when called statically.
    */
   public function method($suffix) {
+    if (!isset($this)) {
+      throw new \Exception('Non-static method called statically.');
+    }
     return 'foo' . $suffix;
   }