How about this: "utilizing jasmine spyOn to mock the behavior of

Currently, I am conducting unit tests on my AngularJS client code and trying to decipher its meaning

 var newdate = new Date(2013,6,29);
    spyOn(Date.prototype, 'getTime').and.callFake(function() {
          return newdate;
        });

In this code snippet, we are mocking the getTime() method of the Date object. However, I am interested in mocking out the new Date() function instead. An example line of code that I need to test includes:

payload.created_at = new Date();

Unfortunately, I do not have access to payload.created_at. Hence, I aim to instruct Jasmine to replace any occurrence of new Date() with a specified date. I attempted the following, but it did not yield the desired result:

spyOn(Date.prototype, 'new Date').and.callFake(function() {
          return newdate;
        });

It became apparent to me that new Date is not a method of the Date object. Could someone please assist me in resolving this issue? Thank you.

Answer №1

The Jasmine Clock feature enables you to simulate the behavior of the JavaScript Date object without the need for manual spying.

For more details, refer to the section on mocking the date.

describe("Mocking the Date object", function(){
    beforeEach(function() {
      jasmine.clock().install();
    });

    it("simulates the Date object and sets it to a specified time", function() {
      var baseTime = new Date(2013, 9, 23);

      jasmine.clock().mockDate(baseTime);

      jasmine.clock().tick(50);
      expect(new Date().getTime()).toEqual(baseTime.getTime() + 50);
    });

    afterEach(function() {
      jasmine.clock().uninstall();
    });
});

Answer №2

After browsing through various resources, I stumbled upon a solution that finally worked for me. The link Mock date constructor with Jasmine provided some insights, but it didn't quite do the trick in my case. It seems like there might be some compatibility issues with my current jasmine version. However, here is the code snippet that resolved the problem:

var oldDate = new Date();
    spyOn(window, 'Date').and.callFake(function() {
      return oldDate;
    });

It's worth noting that there is a slight difference in the .and.callFake implementation between the above code and the one mentioned in the aforementioned link. Hopefully, this helps anyone facing a similar issue. Thanks!

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