diff -u b/core/modules/system/src/Tests/Module/HookRequirementsTest.php b/core/modules/system/src/Tests/Module/HookRequirementsTest.php --- b/core/modules/system/src/Tests/Module/HookRequirementsTest.php +++ b/core/modules/system/src/Tests/Module/HookRequirementsTest.php @@ -117,7 +117,7 @@ // Attempt to install the module. $edit = []; - $edit['modules[testing][requirements1_test][enable]'] = 'requirements1_test'; + $edit['modules[Testing][requirements1_test][enable]'] = 'requirements1_test'; $this->drupalPostForm('admin/modules', $edit, t('Install')); // Assert the expected success or failure.