given:
        buildFile << """
            gradle.taskGraph.afterTask { Task task ->
                if(task.path == ':theTask' && !file('changetrigged').exists()) {
                   file('inputDir/input.txt').createNewFile()
                   file('changetrigged').text = 'done'
                }
            }
        """

        when:
        succeeds("theTask")

        then: