Grails testing, error when using mockFor

gistfile1.gradle

Code:

class RepoControllerTests extends ControllerUnitTestCase {
    protected void setUp() {
        super.setUp()
    }

    protected void tearDown() {
        super.tearDown()
    }

    void testMock() {
        def foo = mockFor(Repo)
        foo.demand.static.listRepos(1..1) { -> return ["one", "two"] }
        foo.use { // line 30
            assertEquals(["one", "two"], Repo.listRepos())
        }
    }
}

Error:

Expecting at least 2 arguments, a category class and a Closure
java.lang.IllegalArgumentException: Expecting at least 2 arguments, a category class and a Closure
	at giggity.RepoControllerTests.testMock(RepoControllerTests.groovy:30)