扔在摩卡测试里面没有被捡起

Question

尽管打印了所有记录器消息，但我不明白为什么我的测试失败了：

it('should reject subscription to a invalid path', async () => {
    const client = fayeConfig.client;
    let subscription: any;

    expect(() => {
        subscription = client.subscribe('/bad_path', (msg: Object) => {
            // do nothing
        });

        subscription.then(() => {
            // 'This should never happen.
            subscription.cancel();
        }, (error: Object) => {
            subscription.cancel();
            logger.debug(`my error ${error}`);
            throw new Error(error.toString());
        }).catch((err: Error) => {
            subscription.cancel();
            logger.debug('something is fishy '+err);
            throw err;
        });
    }).to.throw();
});

我预计错误会出现。任何帮助表示赞赏。干杯！

Answer 1

问题是 expect 需要一个同步函数，而我提供了一个 Promise。所以它调用函数然后继续。为了解决这个问题，我不得不将函数调用包装在一个单独的函数中，然后等待它解决。

it('should reject subscription to a invalid path', async () => {
    const client = fayeConfig.client;
    let subscription: any;

    const testPromise = async () => {
        subscription = client.subscribe('/bad_path', (msg: Object) => {
            // do nothing
        });

        return subscription.then(() => {
            subscription.cancel();
        }, (error: any) => {
            subscription.cancel();
            throw new Error(`This is the correct behaviour : ${error}`);
        });
    };

    let test: any = null;

    try {
        await testPromise();
    } catch (error) {
        test = error;
    }

    expect(test).to.be.not.null;
});

扔在摩卡测试里面没有被捡起

Throw inside of mocha test not being picked up

chai

typescript