CODEWITHSUNDEEP
ember.jsstubsinon
spinlock
spinlock

Reputation: 3957

How can I access the arguments that were provided to a function that I've stubbed in Sinon?

I'm trying to test an EmberJS app that uses Ember.run.debounce. I'd like to use Sinon to stub Ember.run.debounce so that it will just call the debounced method synchronously. Something like this:

debounceStub = sinon.stub(Ember.run, 'debounce')
debounceStub.callsArgWith(1, debounceStub.args[0][2])

to make this code run synchronously:

Ember.run.debounce(@, @handleData, list, 500)

but handleData() is being called with an undefined argument rather than list. Any help figuring out how to pass list in the callsArgWith call would be greatly appreciated.

Thank!

Upvotes: 0

Views: 369

Answers (1)

philipisapain
philipisapain

Reputation: 926

The reason handleData is called with undefined is because the point at which you're defining the behaviour of the stub (callsWithArg(...)) is before the stub has been invoked (through executing your unit-under-test), so the reference to the args is not available yet.

It's a bit ugly, but one solution is to manually invoke the method passed to debounce, something like...

debounceStub = sinon.stub(Ember.run, 'debounce')

//...execute unit-under-test so that `debounce` is called...

//Then pull out the arguments from the call
var callArgs = debounceStub.firstCall.args.slice();
var targetObject = callArgs.shift();
var methodToCall = callArgs.shift();
var methodArgsToPass = callArgs.shift();

//Manually invoke the method passed to `debounce`.
methodToCall.apply(targetObject, methodArgsToPass);

//perform your assertions...

Upvotes: 1

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