7 files declare their use of DomainTestTrait in Domain Access 8

ActiveDomainDefaultArgumentTest.php in domain/tests/src/Functional/Views/ActiveDomainDefaultArgumentTest.php

DomainConfigUIOverrideTest.php in domain_config_ui/tests/src/FunctionalJavascript/DomainConfigUIOverrideTest.php

DomainConfigUiSavedConfigTest.php in domain_config_ui/tests/src/FunctionalJavascript/DomainConfigUiSavedConfigTest.php

DomainConfigUISettingsTest.php in domain_config_ui/tests/src/FunctionalJavascript/DomainConfigUISettingsTest.php

DomainHookTest.php in domain/tests/src/Kernel/DomainHookTest.php

DomainTestBase.php in domain/tests/src/Functional/DomainTestBase.php

DomainVariableSchemeTest.php in domain/tests/src/Kernel/DomainVariableSchemeTest.php