Deploying a TPTP JUnit Plug-in Test (normally) requires the creation and configuring of a Workbench Location. If the deployment is local, there is a default deployment Deployment on the local workbench which is automatically chosen within the Run dialog if a TPTP JUnit Plug-in Test is selected:

NOTE that the default deployment Deployment on the local workbench does not provide, for example,  instance reuse, a headless workbench, nor does it run tests in the UI thread. To obtain these features and other features, you must set up a specific workbench location.