我有以下示例:
<!DOCTYPE html>
<html>
<head>
<title>Mocha</title>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<link rel="stylesheet" href="mocha.css" />
</head>
<body>
<div id="mocha"></div>
<script src="https://cdnjs.cloudflare.com/ajax/libs/mocha/3.1.2/mocha.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/chai/3.5.0/chai.min.js"></script>
<script src="https://unpkg.com/vue/dist/vue.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/vue-resource/1.0.3/vue-resource.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/sinon.js/1.15.4/sinon.js"></script>
<script>mocha.setup('bdd');</script>
<script>
"use strict";
var assert = chai.assert;
var should = chai.should();
var vm = new Vue({
data: {
message: "Hello"
},
methods: {
loadMessage: function() {
this.$http.get("/get").then(
function(value) {
this.message = value.body.message;
});
},
}
});
describe('getMessage', function() {
let server;
beforeEach(function () {
server = sinon.fakeServer.create();
});
it("should get the message", function(done) {
server.respondWith([200, { 'Content-Type': 'application/json' },
JSON.stringify({message: "Test"})]);
vm.message.should.equal("Hello");
vm.loadMessage();
server.respond();
setTimeout(function() {
// This one works, but it's quirky and a possible error is not well represented in the HTML output.
vm.message.should.equal("Test");
done();
}, 100);
// This one doesn't work
//vm.message.should.equal("Test");
});
});
</script>
<script>
mocha.run();
</script>
</body>
</html>
我想测试Vue异步从服务器获取数据。虽然,我用Sinon FakeServer模拟了实际的http请求。
当然,在调用loadMessage
之后,该消息尚未设置。我可以使用超时功能进行测试,但我相信应该有更好的方法。我调查了respondImmediately
,但没有改变。此外,还有可能调用done()函数。但是,据我所知,这需要在loadMessage
函数内调用,因此修改了测试中的代码。
处理此问题的正确方法是什么?
编辑:我找到了至少一个部分解决方案,但似乎仍然很混乱:在mocha单元测试中调用done()函数。当断言失败时,它至少会在html输出中显示。但是,断言消息并不像正常测试那样清晰。此外,这项技术对我来说似乎仍然很混乱。
答案 0 :(得分:1)
由于vue组件的更新是异步完成的,因此需要使用
// Inspect the generated HTML after a state update
it('updates the rendered message when vm.message updates', done => {
const vm = new Vue(MyComponent).$mount()
vm.message = 'foo'
// wait a "tick" after state change before asserting DOM updates
Vue.nextTick(() => {
expect(vm.$el.textContent).toBe('foo')
done()
})
})