To create a test for a Groovy class
  1. Do one of the following:
  2. In the Create Test dialog box, specify the required information, as described in the section Creating Tests.

    ../../Shared/create_test_groovy.png

  3. In the editor of the created test file, in the left gutter, click on the ../../Shared/run_from_left_gutter_icon.png icon to execute run/debug configuration.

    ../../Shared/run_groovy_tests.png

    You can also use a context menu to run or debug your test.

You can navigate between Groovy tests and test subjects (Navigate | Test / Test Subject). If a test class doesn't yet exist, IntelliJ IDEA suggests to create one.