angular - 在 Angular 2 单元测试中测试 Promise 值

Question

Bellow 是示例，测试失败 - str 未定义。 如何从 angular2 中的 promise 中获取值(value)？

 describe('Test', () => {
        it('case of string', () => {
            let t: Promise<string> = deserializeSimpleField(...);
            let str:string;
            t.then(value=>str = value);
            expect(str).toEqual('name');
        });});

Answer 1

异步执行具有传染性。您无法返回同步执行。

describe('Test', () => {
    it('case of string', inject([AsyncTestCompleter], (async: AsyncTestCompleter) => {
        deserializeSimpleField(...)
        .then(value => {
          expect(value).toEqual('name');
          async.done();
        });
    });
});

我在 https://github.com/angular/angular/blob/master/modules/@angular/forms/test/form_array_spec.ts 中查找了它

更新

describe('Test', () => {
    it('case of string', async(() => {
        return deserializeSimpleField(...)
        .then(value => {
          expect(value).toEqual('name');
          async.done();
        });
    }));
});