Node.js Mocha调用所有it回调模拟(测试中间件)

发布于11月16日

我try 在mocha中测试一个中间件. 问题是，在执行它们的回调之前，所有的"it"调用都在等待前一个调用完成.

it(`should trigger pre hook 1`, (done) => {
    use((next) => {
        setTimeout(() => {
            done();
            next();
        }, 1000);
    });
});

it(`should trigger pre hook 2`, (done) => {
    use((next) => {
        setTimeout(() => {
            done();
            next();
        }, 1000);
    });
});

start(() => {
  // middleware done
});

The second it(...) waits for the first to complete.
And thats exactly the problem, since the second use(...) is not called before i fire the start(...) function, so it never gets executed and the test fails.

我如何才能告诉mocha执行所有"it"回调，而不是等待前一个回调完成(或失败)？

推荐答案

try spy而不是done，这样您就可以根据需要布局测试，而不需要依赖mocha来控制流程.

describe('middleware', function(){

    // initialise use/start for this test

    const m1 = sinon.spy()
    const m2 = sinon.spy()
    use((next) => {
        setTimeout(() => {
            m1();
            next();
        }, 1000);
    });
    use((next) => {
        setTimeout(() => {
            m2();
            next();
        }, 1000);
    });

    it(`should process a request through middleware`, function(done){
        start(() => {
            // middleware done
            expect(m1.calledOnce, `m1`).to.equal(true)
            expect(m2.calledOnce, `m2`).to.equal(true)
            done()
        });
    })

})

当您在中间件中有功能代码时，间谍还将允许您判断更复杂的调用场景.