使用superagent +的Mocha测试承诺超时，而不是因“期望"而失败 [英] Mocha tests using superagent + promises timeout rather than fail with 'expect'

问题描述

我正在使用mocha对外部Web服务运行许多集成测试.我使用superagent-promise进行请求/响应处理，并且使用expect作为我的断言库.

I'm using mocha to run a number of integration tests against an external web service. I use superagent-promise for the request/response handling, and I'm using expect as my assertion library.

对于其中的某些测试，我需要将大量请求链接在一起，因此，promise非常有用.但是，我注意到我的测试现在由于超时(并且没有错误消息)而不是错误消息本身而失败.举一个简单的例子:

For some of these tests I need to chain a large number of requests together, so the promises have been very helpful. However I'm noticing that my tests are now failing with a timeout (and no error message) rather than with the error message itself. As a simple example:

  it('[MESSAGES-1] cannot be posted without an auth token', function(done) {
    agent.post(config.webRoot + '/rooms/ABC/messages').send({
      content: 'This is a test!'
    }).end().then(function(res) {
      // Not expected
    }, function(err) {
      expect(err.status).toBe(401)
      done()
    })
  })

按预期工作并通过:

  Messages
    ✓ [MESSAGES-1] cannot be posted without an auth token

但是，如果我更改断言以期望使用不同的状态代码:

However if I alter my assertion to expect a different status code:

expect(err.status).toBe(200) // This should fail

然后测试失败并超时！

  1) Messages [MESSAGES-1] cannot be posted without an auth token:
     Error: timeout of 1000ms exceeded. Ensure the done() callback is being called in this test.

这是常见问题吗?有什么解决方法或可以调整的地方吗?我不想失去使用诺言的能力.

Is this a common problem? Is there a workaround or tweak I can make? I don't want to lose the ability to use promises.

推荐答案

这是一个已知问题吗?

Is this a known issue?

这实际上不是问题.

问题是expect(err.status).toBe(200)引发了一个错误，该错误被.then内部吞没了，并导致代码永远无法到达done().您应该将代码重组为以下内容:

The problem is that expect(err.status).toBe(200) throws an error that is swallowed inside the .then and which causes the code to never reach done(). You should restructure you code to the following:

it('[MESSAGES-1] cannot be posted without an auth token', function(done) {
    agent.post(config.webRoot + '/rooms/ABC/messages').send({
      content: 'This is a test!'
    }).end()

    .then(function(res) {
      // Not expected
    }, function(err) {
      expect(err.status).toBe(401)
      done()
    })
    .catch(function(err) {
        done(err); //report error thrown in .then
    })
  })

这样，您可以捕获并报告expect(err.status).toBe(200)引发的错误.

This way you catch and report the error thrown by expect(err.status).toBe(200).

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