}

    private void runTask(@DelegatesTo(value = BuildLauncher, strategy = Closure.DELEGATE_ONLY) Closure<?> launcherSpec = {}) {
        withConnection {
            def launcher = newBuild().forTasks('printSystemProperty')
            launcherSpec.delegate = launcher
            launcherSpec()
            launcher.setStandardOutput(out)
            launcher.run()
        }
    }