6 files declare their use of YamlFormTestBase in YAML Form 8

YamlFormNodeAccessTest.php in modules/yamlform_node/src/Tests/YamlFormNodeAccessTest.php

YamlFormNodeResultsTest.php in modules/yamlform_node/src/Tests/YamlFormNodeResultsTest.php

YamlFormNodeTest.php in modules/yamlform_node/src/Tests/YamlFormNodeTest.php

YamlFormTemplatesTest.php in modules/yamlform_templates/src/Tests/YamlFormTemplatesTest.php

YamlFormUiElementPropertiesTest.php in modules/yamlform_ui/src/Tests/YamlFormUiElementPropertiesTest.php

YamlFormUiElementTest.php in modules/yamlform_ui/src/Tests/YamlFormUiElementTest.php