Documentation Home Behavior-Driven JavaScript
This page is for an older version of Jasmine (2.0)
The current stable version of Jasmine is: 5.4 - You can also look at the docs for the next release: Edge

upgrading.js

A number of things have changed with the release of jasmine 2.0

 
describe("Upgrading to jasmine 2.0", function() {

Custom Matchers

 
  describe("Custom Matchers", function() {
  beforeEach(function() {

The addMatchers function is no longer on the spec (this) it is now on the global jasmine object.

 
      /* was:
         this.addMatchers({
      */
    jasmine.addMatchers({

A matcher is set up a bit different now. The factory receives a util object which contains things like jasmines equality functions, and any registered customEqualityTesters. The factory is expected to return an object with a compare function which will be called with the actual and expected directly, instead of the actual value being on this

 
        /* was:
           toBeCustom: function(expected) {
             var passed = this.actual == expected;
        */
      toBeCustom: function(util, customEqualityTesters) {
        return {
          compare: function(actual, expected) {
            var passed = actual == expected

The comparison should now return an object with pass and message attributes.

For more information on the use of custom matchers. This page is intended to show the changes necessary to upgrade a 1.x suite to 2.0

 
              /* was:
                this.message = function() {
                  return [
                    'Expected ' + this.actual + ' to equal ' + expected,
                    'Expected ' + this.actual + ' not to equal ' + expected
                  ];
                };
                return passed;
                });
                */
            return {
              pass: passed,
              message: 'Expected ' + actual + (passed ? '' : ' not') + ' to equal ' + expected
            };
          }
        };
      }
    });
  });

Use of custom matchers remains the same

 
    it("uses custom matchers", function() {
    expect(1).toBeCustom(1);
  });
});

Asynchronous Specs

 
  describe("Asynchronous Specs", function() {

We'll pretend this is asynchronous for our tests below

 
    var asyncSetThing,
  somethingAsyncWithCallback = function(callback) {
    asyncSetThing = true;
    callback();
  };

The runs, waits, and waitsFor methods have been removed in favor of allowing functions run as part of the spec to receive and invoke a done callback.

 
    /* was:
       it("calls an async thing and waits", function() {
         var asyncDone = false;
         somethingAsyncWithCallback(function() {
           asyncDone = true
         });

While it used to be necessary to keep track of the async state in the spec itself.

 
         waitsFor(function() {
           return asyncDone;
         });
     */

By having a beforeEach, afterEach, or it receive a done callback, jasmine will wait until that function is invoked before moving to the next thing in the queue. This means if the asynchronous logic also takes a callback for when it is done, jasmines done can just be passed through and jasmine will wait appropriately.

 
    beforeEach(function(done) {
    somethingAsyncWithCallback(done);
  });

  /*
       runs(function() {
         expect(asyncSetThing).toBeTruthy();
       });
     });
     */
  it("will wait until async completes and calls done", function() {
    expect(asyncSetThing).toBeTruthy();
  });
});

Spies

 
  describe("Spies", function() {
  it('should spy', function() {
    var spy = jasmine.createSpy('spy');

All the ways to tell the spy how to behave are no longer their own attribute directly on the spy. There is a single and attribute that has all of the spy behaviors on it so fewer attributes are added to the function being spied upon.

 
       /* was:
        spy.andCallThrough();
        spy.andCallFake(function() {});
        spy.andThrow('error');
        spy.andReturn(1);
        */
    spy.and.callThrough();
    spy.and.callFake(function() {});
    spy.and.throwError('error');
    spy.and.returnValue(1);

Basic setup and check remains the same

 
      spy('foo');
    spy('bar');

    expect(spy).toHaveBeenCalledWith('foo');
    expect(spy).toHaveBeenCalledWith('bar');

Similarly to behaviors, more advanced call checks are on the calls attribute

 
      /* was:
         expect(spy.mostRecentCall.args).toEqual(['bar']);
         expect(spy.callCount).toBe(2);
       */
    expect(spy.calls.mostRecent().args).toEqual(['bar']);
    expect(spy.calls.count()).toBe(2);
  });
});

Clock

 
  describe("Clock", function() {

The jasmine mock clock is now an instanciated object and not a global, and it is now installed instead of being told to useMock.

 
    beforeEach(function() {
  /* was:
       jasmine.Clock.useMock();
     */
    jasmine.clock().install();
  });

ticking the clock remains basically the same

 
    it("uses the clock similarly", function() {
    /* was:
         jasmine.Clock.tick();
       */
    jasmine.clock().tick();
  });

Jasmine 2.0 removes the ability for addons to dynamically add afterEach callbacks. In order to keep the clock from being a special object that is able to uninstall itself, it now needs to be manually uninstalled.

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