title: Selecting specific tests to run in gradle
body: <p>I'm trying to fix our messy failing test runs, and, unfortunately, I'm very new to gradle.  We currently have testng, junit, and I'd like to add some spock tests to the mix as well.  I'm not quite sure how gradle determines which tests to run when I type "gradle test".  How can I prevent the testng &amp;/or junit tests from running?  How can I get gradle to start running my spock tests?</p>