Verifying function call and inspecting arguments using sinon spies

Question

I would like to verify that bar() is called inside foo() from my unit test.

I figured that Sinon spies might be suitable, but I don\'t know

Answer 1

Shouldn't you be spying on bar, rather than foo?

var spy = sinon.spy(bar)

Call foo:

foo()

Check bar was called:

console.log(spy.calledOnce)