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

In your case, you are trying to see if bar was called, so you want to spy bar rather than foo.

As described in the doc :

function bar(x,y) {
  console.debug(x, y);
}
function foo(z) {
  bar(z, z+1);
}
// Spy on the function "bar" of the global object.
var spy = sinon.spy(window, "bar");

// Now, the "bar" function has been replaced by a "Spy" object
// (so this is not necessarily what you want to do) 

foo(1);

bar.getCall(0).args => should be [1,2]

Now, spying on the internals of the function strongly couples your test of "foo" to its implementation, so you'll fall into the usual "mockist vs classical" debate.