Question

假设file1.js有一个名为doSomething（）的函数，它可以动态加载file2.js

file2.js设置全局变量window.FILE2_LOADED == true

我如何编写如下的测试？

describe("A Unit Test", function() {
  it("can I load scripts dynamically here?", function() {
    loadScript('base/file2.js');
    waitForDynamicallyLoadedScriptsToLoad_IWishThisFunctionExisted(function(){
        expect(window.FILE2_LOADED).equal(true);
    });
  });

});

更新：我找到了一些我仍然不喜欢的解决方案（并且没有解决方案），但认为值得记录。

这是在这个Github回购（它使用摩卡，而不是茉莉花） - ＆GT; https://github.com/tonylampada/AngularJS-Testing-Article

您可以使用grunt test:unit

运行它

相关代码位于 dynamic_load_test.js

中

describe("Unit: dynamic loading scripts", function() {
  it("method 1 works, but using setTimeout and done is still ugly"+
    "also, it may interfere with other tests", function(done) {
    console.log('----------- method 1 -------------');
    window.ACOUNTER = undefined;
    loadScript('base/app/scripts/file2.js');
    setTimeout(function(){
        console.log('m1_2: '+window.ACOUNTER);
        expect(window.ACOUNTER).equal(1);
        done()
    }, 1000)
    console.log('m1_1: '+window.ACOUNTER);
  });

  it("method 2 works too, but I don't wanna have acces to the callback", function() {
    window.ACOUNTER = undefined;
    console.log('----------- method 2 -------------');
    loadScript('base/app/scripts/file2.js', function(){
        console.log('m2_2: '+window.ACOUNTER);
        expect(window.ACOUNTER).equal(1);
    });
    console.log('m2_1: '+window.ACOUNTER);
  });

  it("method 3, doesn't work", function() {
    window.ACOUNTER = undefined;
    console.log('----------- method 3 -------------');
    loadScript('base/app/scripts/file2.js');
    describe("wait for all async to finish", function(){
        it("now it will be loaded", function(){
            console.log('m3_2: '+window.ACOUNTER);
            expect(window.ACOUNTER).equal(1);
        })
    })
    console.log('m3_1: '+window.ACOUNTER);
  });

  it("method 4, use jquery. Callback is never invoked.", function() {
    window.ACOUNTER = undefined;
    console.log('----------- method 4 -------------');
    loadScript('base/app/scripts/file2.js');

    $(document).ajaxStop(function () {
        console.log('m4_2: '+window.ACOUNTER);
        expect(window.ACOUNTER).equal(1);
    });

    console.log('m4_1: '+window.ACOUNTER);
  });

});

Answer 1

Jasmine支持异步测试：https://jasmine.github.io/2.0/introduction.html#section-Asynchronous_Support

我还可以通过函数的参数来设置要加载的文件的路径，这样就可以加载一些简单的模拟文件而不是整个（假设需要一些其他依赖项）脚本。

如何单元测试动态加载javascript文件的javascript代码？

1 个答案: