given:
        applyMixFileSet(initialSet)
        outputs.snapshot { run "compileGroovy" }

        when: 'first build'
        applyMixFileSet(firstChange)
        runAndFail "compileGroovy", "--info"

        then:
        outputs.noneRecompiled()

        when: 'second build'
        outputs.snapshot { applyMixFileSet(secondChange)  }
        run "compileGroovy", "--info"