var opts = { call: function (msg) { console.log(msg); } };
var mock = sinon.mock(opts);
 
// You state your success criteria upfront
mock.expects("call").once().withExactArgs("Hello World");
/* ... twice, atMost, never, exactly, on, etc ... */
 
opts.call("Hello World"); 
 
mock.verify();
mock.restore();