done（）的用途和使用方法（量角器，茉莉花） [英] what done() is for and how to use it ( protractor, jasmine)

问题描述

it('should for something', function check(done) {
  browser.sleep(2000);
  $('.csTx').isPresent().then(function(result) {
    if(result) {
      done();
    } else {
      xPage.clickBack();
      check(done);
    }
  })
}, 30000);

有人可以解释done（）的工作原理以及它的用途。我用谷歌搜索了它，但找不到任何容易让我理解的信息。我正在使用量角器和茉莉花进行自动化。请考虑以上代码。

Can someone explain how done() works and what this is for. I googled it but cannot find any information that would be easy enough for me to understand. I am automating with protractor and jasmine. please consider the above code.

推荐答案

如果您的测试创建并行TaskQueue，则需要使用 done 在测试的控制流程中（了解有关的更多信息）承诺和控制流程）。

You need to use done if your test creates a parallel TaskQueue in your test's Control Flow (read more about promises and control flow).

例如：

describe('Control Flow', function() {
    function logFromPromise(text) {
        var deferred = protractor.promise.defer();
        deferred.then(function() {
            console.log(text);
        });
        deferred.fulfill();
        return deferred;
    }

    it('multiple control flows', function() {
        setTimeout(function() {
            logFromPromise('1');
        });
        logFromPromise('0');
    });
}

调用 setTime 创建并行任务队列在控件中：

Calling setTime creates a parallel Task Queue in the control:

ControlFlow
| TaskQueue
| | Task<Run fit("multiple control flows") in control flow>
| | | TaskQueue 
| | | | Task <logFromPromise('0');>
| TaskQueue
| | Task <setTimeout>

量角器认为测试打印 0 后完成。在此示例中，测试完成后可能会打印 1 。要使量角器等待任务< setTimeout> ，您需要调用done函数：

Protractor thinks the test is "done" after 0 is printed. In this example, 1 will probably be printed after the test is completed. To make protractor wait for Task <setTimeout>, you need to call the done function:

    it('multiple control flows', function(done) {
        setTimeout(function() {
            logFromPromise('1').then(function() {
                done();
            });
        });
        logFromPromise('0');
    });

如果可以，请在测试完成时让量角器处理。并行TaskQueues可能会导致测试中出现意外的竞争条件。

If you can, let protractor handle when the test is "done". Having parallel TaskQueues can lead to unexpected race conditions in your test.

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