diff -u b/core/modules/system/lib/Drupal/system/Tests/Form/ModulesListFormWebTest.php b/core/modules/system/lib/Drupal/system/Tests/Form/ModulesListFormWebTest.php
--- b/core/modules/system/lib/Drupal/system/Tests/Form/ModulesListFormWebTest.php
+++ b/core/modules/system/lib/Drupal/system/Tests/Form/ModulesListFormWebTest.php
@@ -31,6 +31,14 @@
   }
 
   /**
+   * {@inheritdoc}
+   */
+  public function setUp() {
+    parent::setUp();
+    \Drupal::state()->get('system_test.module_hidden', FALSE);
+  }
+
+  /**
    * Tests the module list form.
    */
   public function testModuleListForm() {
diff -u b/core/modules/system/tests/modules/system_test/system_test.module b/core/modules/system/tests/modules/system_test/system_test.module
--- b/core/modules/system/tests/modules/system_test/system_test.module
+++ b/core/modules/system/tests/modules/system_test/system_test.module
@@ -43,7 +43,7 @@
   static $test;
   if (($dependencies = \Drupal::state()->get('system_test.dependencies')) || $test) {
     if ($file->name == 'module_test') {
-      $info['hidden'] = FALSE;
+      $info['hidden'] =  \Drupal::state()->get('system_test.module_hidden', TRUE);
       $info['dependencies'][] = array_shift($dependencies);
       \Drupal::state()->set('system_test.dependencies', $dependencies);
       $test = TRUE;