Update to Drupal 8.2.0. For more information, see https://www.drupal.org/project/drupal/releases/8.2.0

core/modules/system/tests/themes/test_basetheme/config/install/core.date_format.fancy.yml

@@ -1,6 +1,6 @@
 # Themes are not supposed to provide/install this kind of config normally.
 # This exists for testing purposes only.
-# @see \Drupal\system\Tests\Extension\ThemeInstallerTest
+# @see \Drupal\KernelTests\Core\Theme\ThemeInstallerTest
 id: fancy
 label: 'Fancy date'
 status: true

core/modules/system/tests/themes/test_theme_libraries_empty/test_theme_libraries_empty.info.yml

@@ -0,0 +1,8 @@
+name: 'Test theme libraries empty'
+type: theme
+description: 'Test theme with empty libraries in theme.info.yml'
+version: VERSION
+base theme: classy
+core: 8.x
+libraries:
+