Nesiting spies to see if a callback in a deep nest has worked.

jasmine.nested_spies.spec.js

function nestedCallbacks(callback) {
    console.log("start");
    firstNest(function () {
        secondNest(function () {
            callback("test");
        });
    });
}

function firstNest(callback) {
    console.log("in first");
    // Do some AJAX calls, then call callback later
    callback();
}

function secondNest(callback) {
    console.log("in second");
    // Do some AJAX calls, then call callback later
    callback();
}

describe("nested spies", function () {
    it("calls a nested callback function with true", function () {
        console.log("in test");
        var callback = jasmine.createSpy();
        spyOn(window, "firstNest").andCallFake(function (callback1) {callback1();});
        spyOn(window, "secondNest").andCallFake(function (callback2) {callback2();});
        nestedCallbacks(callback);
        expect(callback).toHaveBeenCalledWith("test");
    });
});