7 files declare their use of PathAlias in Drupal 8

DeprecatedServicesTest.php in core/modules/path_alias/tests/src/Kernel/DeprecatedServicesTest.php

PathAliasResourceTestBase.php in core/modules/path_alias/tests/src/Functional/Rest/PathAliasResourceTestBase.php

PathAliasTest.php in core/modules/jsonapi/tests/src/Functional/PathAliasTest.php

PathAliasToEntityUpdateTest.php in core/modules/system/tests/src/Functional/Update/PathAliasToEntityUpdateTest.php

PathHooksTest.php in core/modules/path_alias/tests/src/Kernel/PathHooksTest.php

system.install in core/modules/system/system.install

Install, update and uninstall functions for the system module.

system_test.module in core/modules/system/tests/modules/system_test/system_test.module

Test module.