diff -u b/core/includes/theme.inc b/core/includes/theme.inc
--- b/core/includes/theme.inc
+++ b/core/includes/theme.inc
@@ -1476,7 +1476,7 @@
     }
 
     // The value is not used; the weight is ignored for themes currently.
-    $theme_config->set("enabled.$key", 0)->save();;
+    $theme_config->set("enabled.$key", 0)->save();
     $disabled_themes->clear($key)->save();
 
     // Refresh the theme list as config_install_default_config() needs an
diff -u b/core/modules/config/lib/Drupal/config/Tests/ConfigOtherModuleTest.php b/core/modules/config/lib/Drupal/config/Tests/ConfigOtherModuleTest.php
--- b/core/modules/config/lib/Drupal/config/Tests/ConfigOtherModuleTest.php
+++ b/core/modules/config/lib/Drupal/config/Tests/ConfigOtherModuleTest.php
@@ -44,7 +44,7 @@
     // Check that the config entity doesn't exist before the config_test module
     // is enabled. We cannot use the entity system because the config_test
     // entity type does not exist.
-    $config = \Drupal::config('config_test.dynamic.other_module');
+    $config = $this->container->get('config.factory')->get('config_test.dynamic.other_module');
     $this->assertTrue($config->isNew(), 'Default configuration for other modules is not installed if that module is not enabled.');
 
     // Install the module that provides the entity type. This installs the
@@ -56,7 +56,7 @@
     // default configuration.
     $this->moduleHandler->disable(array('config_test'));
     $this->moduleHandler->uninstall(array('config_test'));
-    $config = \Drupal::config('config_test.dynamic.other_module');
+    $config = $this->container->get('config.factory')->get('config_test.dynamic.other_module');
     $this->assertTrue($config->isNew(), 'Default configuration for other modules is removed when the config entity provider is disabled.');
 
     // Install the module that provides the entity type again. This installs the
diff -u b/core/modules/config/tests/config_other_module_config/config_other_module_config.module b/core/modules/config/tests/config_other_module_config/config_other_module_config.module
--- b/core/modules/config/tests/config_other_module_config/config_other_module_config.module
+++ b/core/modules/config/tests/config_other_module_config/config_other_module_config.module
@@ -4,4 +4,3 @@
  * @file
- * Config test module to test a supplying a configuration entity owned by
- * another module.
+ * Test module which supplies a configuration entity owned by another module.
  */