在subscribe()中失败的expect()不会将测试标记为无效 [英] Failing expect() inside subscribe() does not mark test as invalid

问题描述

我们最近升级到Angular 6.0.3，RxJs 6.2.0和jest 23.1.0(从RxJS 5和Angular 4升级).

We recently upgraded to Angular 6.0.3, RxJs 6.2.0 and jest 23.1.0 (upgrading from RxJS 5 & Angular 4).

Jest&似乎有问题RxJs作为subscribe-Block中失败的期望陈述，不会将测试标记为失败.这是一个最小的示例:

There seems to be a problem with Jest & RxJs as failing expect-statements inside a subscribe-Block do not mark the test as failed. Here's a minimal example:

    it("should fail", () => {

        const obs = Observable.create((observer) => {
            observer.next(false);
        });

        obs.subscribe((value) => {
            console.log(value); // => false
            expect(value).toBeTruthy();
        });

    });

expect-Statement被执行，但是测试仍然通过.在以前的RxJs版本和Jest中，我们没有观察到这种行为.

The expect-Statement gets executed, but the test still passes. We didn't observe this behaviour with the previous RxJs version and Jest.

推荐答案

尝试使用完成.

it("should fail", (done) => {

    const obs = Observable.create((observer) => {
        observer.next(false);
    });

    obs.subscribe((value) => {
        console.log(value); // => false
        expect(value).toBeTruthy();
        done();
    });

});

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