diff --git a/core/modules/system/tests/src/FunctionalJavascript/ModuleFilterTest.php b/core/modules/system/tests/src/FunctionalJavascript/ModuleFilterTest.php
index eaf15286c1..3a41db1ce6 100644
--- a/core/modules/system/tests/src/FunctionalJavascript/ModuleFilterTest.php
+++ b/core/modules/system/tests/src/FunctionalJavascript/ModuleFilterTest.php
@@ -53,8 +53,11 @@ public function testModuleFilter() {
     $filter->setValue('test');
     $session->wait(1000, 'jQuery("#module-node:visible").length == 0');
     $visible_rows = $this->filterVisibleElements($module_rows);
+    // Test Drupal.announce() message when multiple matches are expected.
+    $expected_message = count($visible_rows) . ' modules are available in the modified list.';
+    $assertSession->elementTextContains('css', '#drupal-live-announce', $expected_message);
     self::assertGreaterThan(count($visible_rows), count($module_rows));
-    $this->assertGreaterThan(1, count($visible_rows));
+    self::assertGreaterThan(1, count($visible_rows));
 
     // Test Drupal.announce() message only one match is expected.
     // Using a very specific module name, we expect only one row.