How Do I Write Karma Test For $.Post().Fail()

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Jasmine

Karma

The case for $.post().fail() is giving error in karma test runner. "TypeError: Cannot read property 'fail' of undefined".

How do i write test for $.post().fail()and done().

My angular code is here :

$scope.fetch_data = function (urlbase) {
        $.post(urlbase + "/GetBranchMapping", null, function (data) {
            $scope.branchInstanceList = data;
            $scope.$apply();
            $("#divLoading").hide();
        }, "json").fail(function (xhr, status, error) {
            if (xhr.status == 500) {
                $("#divLoading").hide();
                alert(error);
            }
            else if (xhr.status == "403") {
                alert("You are not authorized to view this page.");
                xhr.status = "0";
            }
        });
    };

And my test case is here :

it("should be able to hide div", function () {
        var fakeData = "This will be the new html";
        var fakeError="Error";
        spyOn($, "ajax").andCallFake(function(params) {
            params.success(fakeData);
        });

        //var elm = compiled('<div id="divLoading">loading...</div>')(scope);

        scope.fetch_data('https://localhost/reportingblotter');


        //elm.hide();
        expect($('#divLoading').css('display')).toBe('none');


    })

Spy for paramas.success() is working, whereas if i used params.fail() its not.

Please help me if anyone has solution.