Example of mocking response with interceptor

[aaronshaf]

I would like to intercept a request and then pre-emptively resolve with a response (compare https://github.com/trek/pretender). Is there an example of this being done elsewhere?

[aaronshaf]

From what I can tell, this isn't possible with the current version of axios. An interceptor needs some way of preempting dispatchRequest.

[mzabriskie]

Is this to accommodate a test scenario?

[aaronshaf]

Yes, that and caching

On Mon, Feb 2, 2015 at 9:05 PM, Matt Zabriskie notifications@github.com
wrote:

Is this to accommodate a test scenario?

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Reply to this email directly or view it on GitHub
#40 (comment).

[mzabriskie]

With version 0.6.0 you will be able to specify a custom adapter, which facilitates testing. There will also be built in caching of GET requests.

There's also this neat lib that is inspired by pretender that you could use https://github.com/aaronshaf/xhr-interceptor :)

[resistdesign]

@mzabriskie How do you specify a custom adapter now?

[mzabriskie]

@resistdesign functionality didn't make the cut for 0.6.0. Will work on this for a future release.

[sekoyo]

Any update on this? I much prefer axios's Promise api than superagent's callback api but I would need a way of mocking to adopt it. Thanks

[aeirola]

You can do this with axios' interceptors by failing each request, but resolving the promise in the response error handler.

// Add request interceptor to force the request to fail
axios.interceptors.request.use((config) => {
  // Mangle URL to skip network request
  config.url = 'http://localhost:0/' + config.url;
  return config;
});

instance.interceptors.response.use((response) => {
  // Shouldn't really be called, ever
  return response;
}, (error) => {
  /* Returning a resolved promise from error handler
     will make final promise resolve as though the request
     would have returned successfully */
  return Promise.resolve({
    data: {/* response data */},
    status: 200,
    statusText: 'OK',
    headers: {},
    config: error.config
  });
});

[mzabriskie]

For anyone looking to address mocking for a test scenario I have created moxios.