theme_test.libraries.yml in Drupal 8

core/modules/system/tests/modules/theme_test/theme_test.libraries.yml

File

core/modules/system/tests/modules/theme_test/theme_test.libraries.yml

theme_stylesheets_override_and_remove_test:
  version: VERSION
  css:
    base:
      css/base-remove.css: {}
      css/sub-override.css: {}
      css/sub-remove.css: {}