Developer Guide: Angular Services: Testing Angular Services

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Following is a unit test for the service in the example in Creating Angular Services. The unit test example uses Jasmine spy (mock) instead of a real browser alert.

var mock, notify;

beforeEach(function() {
  mock = {alert: jasmine.createSpy()};
  notify = angular.service('notify')(mock);
});

it('should not alert first two notifications', function() {
  notify('one');
  notify('two');

  expect(mock.alert).not.toHaveBeenCalled();
});

it('should alert all after third notification', function() {
  notify('one');
  notify('two');
  notify('three');

  expect(mock.alert).toHaveBeenCalledWith("one\ntwo\nthree");
});

it('should clear messages after alert', function() {
  notify('one');
  notify('two');
  notify('third');
  notify('more');
  notify('two');
  notify('third');

  expect(mock.alert.callCount).toEqual(2);
  expect(mock.alert.mostRecentCall.args).toEqual(["more\ntwo\nthird"]);
});

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