how to execute a single unit test case using activator?

we are using play framework and activator as a build tool,we have many unit test cases written in out project,can you please tell me how to run single unit test case using activator ? i tried running this command in command line

activator test-only SampleNodeServiceImplTest. but this command is running all the test cases in the project. but i want to run only one specific unit test case.