9 files declare their use of StubTestTrait in Zircon Profile 8

MigrateAggregatorStubTest.php in core/modules/aggregator/src/Tests/Migrate/MigrateAggregatorStubTest.php

Contains \Drupal\aggregator\Tests\Migrate\MigrateAggregatorStubTest.

MigrateBlockContentStubTest.php in core/modules/block_content/src/Tests/Migrate/MigrateBlockContentStubTest.php

Contains \Drupal\block_content\Tests\Migrate\MigrateBlockContentStubTest.

MigrateCommentStubTest.php in core/modules/comment/src/Tests/Migrate/MigrateCommentStubTest.php

Contains \Drupal\comment\Tests\Migrate\MigrateCommentStubTest.

MigrateFileStubTest.php in core/modules/file/src/Tests/Migrate/MigrateFileStubTest.php

Contains \Drupal\file\Tests\Migrate\MigrateFileStubTest.

MigrateMenuLinkContentStubTest.php in core/modules/menu_link_content/src/Tests/Migrate/MigrateMenuLinkContentStubTest.php

Contains \Drupal\menu_link_content\Tests\Migrate\MigrateMenuLinkContentStubTest.

MigrateNodeStubTest.php in core/modules/node/src/Tests/Migrate/MigrateNodeStubTest.php

Contains \Drupal\node\Tests\Migrate\MigrateNodeStubTest.

MigrateShortcutStubTest.php in core/modules/shortcut/src/Tests/Migrate/MigrateShortcutStubTest.php

Contains \Drupal\shortcut\Tests\Migrate\MigrateShortcutStubTest.

MigrateTaxonomyTermStubTest.php in core/modules/taxonomy/src/Tests/Migrate/MigrateTaxonomyTermStubTest.php

Contains \Drupal\taxonomy\Tests\Migrate\MigrateTaxonomyTermStubTest.

MigrateUserStubTest.php in core/modules/user/src/Tests/Migrate/MigrateUserStubTest.php

Contains \Drupal\user\Tests\Migrate\MigrateUserStubTest.