6 files declare their use of EntityTestMulRev in Zircon Profile 8

EntityQueryTest.php in core/modules/system/src/Tests/Entity/EntityQueryTest.php

Contains \Drupal\system\Tests\Entity\EntityQueryTest.

EntityRevisionTranslationTest.php in core/modules/system/src/Tests/Entity/EntityRevisionTranslationTest.php

Contains \Drupal\system\Tests\Entity\EntityRevisionTranslationTest.

EntityTranslationTest.php in core/modules/system/src/Tests/Entity/EntityTranslationTest.php

Contains \Drupal\system\Tests\Entity\EntityTranslationTest.

EntityViewsDataTest.php in core/modules/views/tests/src/Unit/EntityViewsDataTest.php

Contains \Drupal\Tests\views\Unit\EntityViewsDataTest.

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

Test module for the entity API providing a bundle field.

FieldItemTest.php in core/modules/system/src/Tests/Field/FieldItemTest.php

Contains \Drupal\system\Tests\Field\FieldItemTest.