使用 Jasmine 测试异步回调

2022-01-11 00:00:00 asynchronous jasmine javascript

我正在使用 Jasmine 2.1.我正在尝试使用 Jasmine 2.1 来测试一个模块.我的一个模块具有异步执行代码的功能.当应用程序完成执行时，我需要测试函数的结果.有没有办法做到这一点?目前，我的模块如下所示:

I'm using Jasmine 2.1. I am trying to use Jasmine 2.1 to test a module. One of my modules has a function that executes code asynchronously. I need to test the result of the function when the app is done executing. Is there a way to do this? Currently, my module looks like this:

var otherModule = require('otherModule');
function MyModule() {
}

MyModule.prototype.state = '';
MyModule.prototype.execute = function(callback) {
  try {
    this.state = 'Executing';
    var m = new otherModule.Execute(function(err) {
      if (err) {
        this.state = 'Error';
        if (callback) {
          callback(err);
        }
      } else {
        this.state = 'Executed';
        if (callback) {
          callback(null);
        }
      }
    });
  } catch (ex) {
    this.state = 'Exception';
    if (callback) {
      callback(ex);
    }
  }
};

module.exports = MyModule;

我正在尝试使用以下内容测试我的模块:

I am trying to test my Module with the following:

var MyModule= require('./myModule');
describe("My Module", function() {
  var myModule = new MyModule();
  it('Execute', function() {
    myModule.execute();
    expect(myModule.state).toBe('Executed');
  });
});

显然，测试并没有等待执行发生.如何通过 Jasmine 测试异步执行的函数?另外，我是否正确使用了状态变量?我迷失在异步堆栈中，不确定在哪里可以使用 'this'.

Clearly, the test is not awaiting for the execution to occur. How do I test an asynchronous executed function via Jasmine? In addition, am I using the state variable properly? I get lost in the asynchronous stack and I'm unsure where I can use 'this'.

推荐答案

我建议看看 茉莉花文档的异步部分.因此，有了这些信息，我们可以使用 done 回调来等待执行完成，然后再进行测试，如下所示:

I would recommend taking a look at the async section of the jasmine docs. So, with this information we can use a done callback to wait for the execution to finish before testing anything, like this:

var MyModule= require('./myModule');
describe("My Module", function() {
  var myModule = new MyModule();
  it('Execute', function(done) {
    myModule.execute(function(){
        expect(myModule.state).toBe('Executed');
        done();
    });
  });
});

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