/** * Tests empty libraries in theme.info.yml file. */ public function testThemeLibrariesEmpty() { $theme = new Extension($this->root, 'theme', '/core/modules/system/tests/themes/test_theme_libraries_empty', 'test_theme_libraries_empty.info.yml'); try { $this->themeHandler->addTheme($theme); $this->assertTrue(TRUE, 'Empty libraries key in theme.info.yml does not cause PHP warning'); } catch (\Exception $e) { $this->fail('Empty libraries key in theme.info.yml causes PHP warning.'); } }