Spock: mock a method with varargs

Question

This question is an offshoot of this Q&A: Test Groovy class that uses System.console()

The problem:

Spock framework incorrectly checks a

Answer 1

You can avoid having to explain the varargs by using Mock() instead of GroovyMock().

In general, when writing Spock specifications you should prefer Spock's Mock object over Groovy's GroovyMock unless you intend to use some of the unique functionality from GroovyMock. Reference

Swapping out Mock for GroovyMock allows you to avoid the verbose Object params:

        setup:
            def consoleM = Mock(IConsole)
            1 * consoleM.readline(_) >> "hey"

        when:
            def result = consoleM.readline("prompt")

        then:
            result == "hey"