Stub out module function

Question

Edit: Being a little bit more precise.

I want to test usecases for a Github API wrapper extension, that our team has created. For testing, we don\'t want to use API wrap

Answer 1

There might be a way to accomplish this in pure Sinon, but I suspect it would be pretty hacky. However, proxyquire is a node library that is designed for solving these sort of issues.

Supposing you want to test some module foo that makes use of the github module; you'd write something like:

var proxyquire = require("proxyquire");
var foo = proxyquire(".foo", {"./github", myFakeGithubStub});

where myFakeGithubStub can be anything; a complete stub, or the actual implementation with a few tweaks, etc.

If, in the above example, myFakeGithubStub has a property "@global" set as true, (i.e. by executing myFakeGithubStub["@global"] = true) then the github module will be replaced with the stub not only in the foo module itself, but in any module that the foo module requires. However, as stated in the proxyquire documentation on the global option, generally speaking this feature is a sign of poorly designed unit tests and should be avoided.