如何多次运行Nightwatch node runner？

Question

下面是一些非常简单的代码。在我的应用程序中，我需要在一个节点脚本中运行runner两次，每次都使用我动态提供的不同设置。但是，当我第二次尝试调用nightwatch.runner时，它将永远不会运行。我做错了什么吗？

var nightwatch = require("nightwatch")
var runcount = 0

function run() {
    // the second time it gets here, nightwatch.runner wont run. the callback will never fire.
    nightwatch.runner({
        config: "nightwatch.conf.js"
    }, function(success) {
        runcount += 1
        if (runcount === 1) {
            // run again
            run()
        } else {
            finish()
        }
    })
}

function finish() {
    console.log("finish")
}

run()

Answer 1

看起来Nightwatch在两次运行之间保持了一些全局状态，这导致了意外的行为。为了避免这种情况，我建议您使用child_process在单独的进程中生成Nightwatch runners：

var spawn = require('child_process').spawn;
var runcount = 0

function run() {
    // the second time it gets here, nightwatch.runner wont run. the callback will never fire.
    spawn('nightwatch', ['-c', 'nightwatch.conf.js'], { stdio: 'inherit' }).on('close', function() {
        runcount += 1
        if (runcount === 1) {
            // run again
            run()
        } else {
            finish()
        }
    })
}

function finish() {
    console.log("finish")
}

run()

Answer 2

它不会运行，因为它最有可能尝试用相同的端口启动两个selenium进程。

如果您需要并行运行测试，您可以通过指定多个测试设置在nightwatch中执行此操作。点击这里查看：http://nightwatchjs.org/guide/#parallel-running

Answer 3

基于@akm解决方案

var spawn = require('child_process').spawn,
    times = 10,
    runcount = 0;

function run() {
    // the second time it gets here, nightwatch.runner wont run. the callback will never fire.
    spawn('./node_modules/.bin/nightwatch', ['-e', 'default,firefox'], {
        stdio: 'inherit'
    })
        .on('close', function() {
            runcount += 1
            if (runcount <= times) {
                console.log('Running test #', runcount);
                // run again
                run()
            } else {
                finish()
            }
        })
        .on('error', function(err) {
            console.log('Error', err);
        })
}

function finish() {
    console.log('Test proccess was completed');
}

run()