6 files declare their use of SchemaCheckTestTrait

EntityReferenceFieldTest.php in core/tests/Drupal/KernelTests/Core/Entity/EntityReferenceFieldTest.php
MigrateTaxonomyConfigsTest.php in core/modules/taxonomy/tests/src/Kernel/Migrate/MigrateTaxonomyConfigsTest.php
MigrateUserConfigsTest.php in core/modules/user/tests/src/Kernel/Migrate/d6/MigrateUserConfigsTest.php
MigrateUserSettingsTest.php in core/modules/user/tests/src/Kernel/Migrate/d7/MigrateUserSettingsTest.php
StandardTestTrait.php in core/profiles/standard/tests/src/Traits/StandardTestTrait.php
UserActionConfigSchemaTest.php in core/modules/user/tests/src/Kernel/UserActionConfigSchemaTest.php

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