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Rails will infer the controller you want to test from the class name of the test case. For example...
class PeopleControllerTest < ActionController::TestCase end
will test the app/controllers/people_controller.rb.
To change this is trivial. Use the "test" method inside your test case.
class PeopleControllerImportContactsFromGmailTest < ActionController::TestCase tests PeopleController end
You might want to do this to separate actions in your controller by file in your test suite.