Sinon method chaining weird behaviour

[phnah]

Sinon.js (v1.14.1) has a weird behaviour in method chaining, not sure it's meant to be or a bug:

This (JSBin):

var myStub = sinon.stub().withArgs(1).returns("one").withArgs(2).returns("two");

Will always return "two" no matter what argument you call myStub with.

On the other hand, this (JSBin):

var myStub = sinon.stub();
myStub.withArgs(1).returns("one").withArgs(2).returns("two");

works fine. I'm not sure that SinonJS supports chaining or not.

Thanks, guys.

[mantoni]

The "implementation detail" behind this is, that withArgs and returns returns a "behavior" and not the stub instance. The behaviors can be chained. In your first snippet, you assign a behavior instance to myStub.

I can see that this is not really intuitive, but it's not a bug. Maybe it could be clarified in the docs.

[phnah]

Thanks a lot @mantoni.