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 how to use them.

Is there any way to check that the method is called? Perhaps even extracting the arguments used in the bar() call?

var spy = sinon.spy(foo);  function foo(){     bar(1,2,3); }  function bar(){ }  foo();  // what to do with the spy? 

http://jsfiddle.net/8by9jg07/

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 var spy = sinon.spy(window, "bar");  // Now, the "bar" function has been replaced by a "Spy" object // (so this is not necessarily what you want to do)   foo(1);  bar.getCall(0).args =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.