10 files declare their use of StubTestTrait

MigrateAggregatorStubTest.php in core/modules/aggregator/tests/src/Kernel/Migrate/MigrateAggregatorStubTest.php
MigrateBlockContentStubTest.php in core/modules/block_content/tests/src/Kernel/Migrate/MigrateBlockContentStubTest.php
MigrateCommentStubTest.php in core/modules/comment/tests/src/Kernel/Migrate/MigrateCommentStubTest.php
MigrateEntityContentBaseTest.php in core/modules/migrate/tests/src/Kernel/MigrateEntityContentBaseTest.php
MigrateFileStubTest.php in core/modules/file/tests/src/Kernel/Migrate/MigrateFileStubTest.php
MigrateMenuLinkContentStubTest.php in core/modules/menu_link_content/tests/src/Kernel/Migrate/MigrateMenuLinkContentStubTest.php
MigrateNodeStubTest.php in core/modules/node/tests/src/Kernel/Migrate/MigrateNodeStubTest.php
MigrateShortcutStubTest.php in core/modules/shortcut/tests/src/Kernel/Migrate/MigrateShortcutStubTest.php
MigrateTaxonomyTermStubTest.php in core/modules/taxonomy/tests/src/Kernel/Migrate/MigrateTaxonomyTermStubTest.php
MigrateUserStubTest.php in core/modules/user/tests/src/Kernel/Migrate/MigrateUserStubTest.php

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