diff --git a/core/tests/Drupal/Tests/Core/StringTranslation/TranslatableMarkupTest.php b/core/tests/Drupal/Tests/Core/StringTranslation/TranslatableMarkupTest.php
index 974b374..e48c610 100644
--- a/core/tests/Drupal/Tests/Core/StringTranslation/TranslatableMarkupTest.php
+++ b/core/tests/Drupal/Tests/Core/StringTranslation/TranslatableMarkupTest.php
@@ -94,9 +94,8 @@ public function testIsStringAssertion() {
    * @covers ::__construct
    */
   public function testIsStringAssertionWithFormattableMarkup() {
-    $translation = $this->getStringTranslationStub();
-    $this->setExpectedException(\InvalidArgumentException::class, '$string ("foo") must be a string.');
     $formattable_string = new FormattableMarkup('@bar', ['@bar' => 'foo']);
+    $this->setExpectedException(\InvalidArgumentException::class, '$string ("foo") must be a string.');
     new TranslatableMarkup($formattable_string);
   }