14 files declare their use of EntityTestRev in Drupal 9

ContentEntityNonRevisionableFieldTest.php in core/tests/Drupal/KernelTests/Core/Entity/ContentEntityNonRevisionableFieldTest.php

DeleteMultipleFormTest.php in core/tests/Drupal/FunctionalTests/Entity/DeleteMultipleFormTest.php

EntityAccessControlHandlerTest.php in core/tests/Drupal/KernelTests/Core/Entity/EntityAccessControlHandlerTest.php

EntityDuplicateTest.php in core/tests/Drupal/KernelTests/Core/Entity/EntityDuplicateTest.php

FieldDisplayTest.php in core/modules/field/tests/src/Kernel/FieldDisplayTest.php

FieldFieldTest.php in core/modules/views/tests/src/Kernel/Handler/FieldFieldTest.php

FieldFormatterTest.php in core/modules/field/tests/src/Kernel/FieldFormatterTest.php

InitialStateTest.php in core/modules/content_moderation/tests/src/Kernel/InitialStateTest.php

MediaLibraryWidgetTest.php in core/modules/media_library/tests/src/Kernel/MediaLibraryWidgetTest.php

ModerationInformationTest.php in core/modules/content_moderation/tests/src/Kernel/ModerationInformationTest.php

OptionsDynamicValuesTestBase.php in core/modules/options/tests/src/Functional/OptionsDynamicValuesTestBase.php

SqlContentEntityStorageSchemaColumnTest.php in core/modules/field/tests/src/Kernel/Entity/Update/SqlContentEntityStorageSchemaColumnTest.php

StateFormatterTest.php in core/modules/content_moderation/tests/src/Kernel/StateFormatterTest.php

StringFormatterTest.php in core/modules/field/tests/src/Kernel/String/StringFormatterTest.php