10 files declare their use of FieldUiTestTrait in Drupal 9

CommentNonNodeTest.php in core/modules/comment/tests/src/Functional/CommentNonNodeTest.php

ContactSitewideTest.php in core/modules/contact/tests/src/Functional/ContactSitewideTest.php

EntityReferenceAdminTest.php in core/modules/field/tests/src/Functional/EntityReference/EntityReferenceAdminTest.php

EntityReferenceAdminTest.php in core/modules/field/tests/src/FunctionalJavascript/EntityReference/EntityReferenceAdminTest.php

FieldUIDeleteTest.php in core/modules/field_ui/tests/src/Functional/FieldUIDeleteTest.php

FileFieldWidgetTest.php in core/modules/file/tests/src/Functional/FileFieldWidgetTest.php

FileFieldWidgetTest.php in core/modules/file/tests/src/FunctionalJavascript/FileFieldWidgetTest.php

LinkFieldUITest.php in core/modules/link/tests/src/Functional/LinkFieldUITest.php

ManageDisplayTest.php in core/modules/field_ui/tests/src/Functional/ManageDisplayTest.php

ManageFieldsFunctionalTest.php in core/modules/field_ui/tests/src/Functional/ManageFieldsFunctionalTest.php