6 files declare their use of EntityViewMode in Zircon Profile 8

DisplayApiTest.php in core/modules/field/src/Tests/DisplayApiTest.php

Contains \Drupal\field\Tests\DisplayApiTest.

EntityDisplayTest.php in core/modules/field_ui/src/Tests/EntityDisplayTest.php

Contains \Drupal\field_ui\Tests\EntityDisplayTest.

FieldUIRouteTest.php in core/modules/field_ui/src/Tests/FieldUIRouteTest.php

Contains \Drupal\field_ui\Tests\FieldUIRouteTest.

MigrateViewModesTest.php in core/modules/node/src/Tests/Migrate/d6/MigrateViewModesTest.php

Contains \Drupal\node\Tests\Migrate\d6\MigrateViewModesTest.

MigrateViewModesTest.php in core/modules/field/src/Tests/Migrate/d7/MigrateViewModesTest.php

Contains \Drupal\field\Tests\Migrate\d7\MigrateViewModesTest.

RowUITest.php in core/modules/views_ui/src/Tests/RowUITest.php

Contains \Drupal\views_ui\Tests\RowUITest.