量角器 - 在做下一步之前等待异步承诺

Question

首先,我已经检查了关于这一点的各种帖子和博客,我仍然无法弄清楚如何正确地做到这一点.

我尝试了许多不同的组合:

• 浏览器等待
• protractor.controlFlow().执行
• protractor.controlFlow().等待(

...仍然没有成功..

我的问题

在我的beforeEach函数中,我想调用一个量角器承诺并在执行其余代码之前等待它解决.

我的守则

我已经为愿意帮助我的人准备了这个简单的测试

describe('testAsync', function() {

  beforeEach(function() {
    console.log('beforeEach - step 1 ')

    browser.get("https://angularjs.org/");
    console.log('beforeEach - step 2 ')
    testFunc()
    console.log('beforeEach - after testFunc - step 3')

  });

  var testFunc = function(){

    console.log("testFunc - step 1")

    browser.wait(function() {
      var deferred = protractor.promise.defer();
      element(by.id('twitter-widget-1')).isPresent()
        .then(function (isPresent) {
          console.log("testFunc - step 2")
          deferred.fulfill(isPresent);
      });
      return deferred.promise;
    });

    console.log("testFunc - step 3")

  }

  it('test after BeforeEach', function() {
    console.log("Last trace")
  });

});

电流输出

[launcher] Running 1 instances of WebDriver
beforeEach - step 1
beforeEach - step 2
testFunc - step 1
testFunc - step 3
beforeEach - after testFunc - step 3
testFunc - step 2
Last trace

预期产出

[launcher] Running 1 instances of WebDriver
beforeEach - step 1
beforeEach - step 2
testFunc - step 1
testFunc - step 2 // <------  This is within the promise resolve
testFunc - step 3
beforeEach - after testFunc - step 3
Last trace

Answer 1

我想这会得到你想要的输出:

describe('testAsync', function() {

  beforeEach(function() {
    console.log('beforeEach - step 1 ');

    // `get` implicitly registers a promise with the control flow
    browser.get("https://angularjs.org/");

    console.log('beforeEach - step 2 '); // runs "before" get above returns!

    testFunc().then(function() {
       // use a then to explicitly chain a dependency off a promise
       console.log('beforeEach - after testFunc - step 3');
    })

    protractor.promise.controlFlow().execute(function() {
       console.log('beforeEach - after testFunc, via controlFlow - step 4');
    });

    console.log('beforeEach - end of beforeEach - everything registered, nothing done');
  });

  var testFunc = function(){

    console.log("testFunc - step 1")

    // return browser wait promise to caller
    // `wait` also implicitly registers with the control flow
    return browser.wait(function() {
      return element(by.id('twitter-widget-1')).isPresent()
        .then(function (isPresent) {
          console.log("testFunc - step 2")
          return true; // tell wait its done by resolving then promise->element promise->wait
      });
    });
  }

  it('test after BeforeEach', function() {
    console.log("Last trace")
  });

});