Encountering an error while using $state.go function in Angular JS testing

Below is the code snippet for a Controller in Angular JS:

describe('Controller: homeCtrl', function () {
  beforeEach(module('incident'));
  var homeCtrl, $state;

  beforeEach(inject(function ($controller, _$state_) {
      $state = _$state_;
      homeCtrl = $controller('homeCtrl', {$state: $state});
  }));

  it('should be defined', function () {
    expect(homeCtrl).toBeDefined();
  });

  it('should transition to state', inject(function ($state) {
      $state.expectTransitionTo('incidents');
  }));
});

When attempting to test $state.go as shown below, an error occurs (refer to attached image):

describe('Controller: homeCtrl', function () {
  beforeEach(module('incident'));
  var homeCtrl, $state;

  beforeEach(inject(function ($controller, _$state_) {
      $state = _$state_;
      homeCtrl = $controller('homeCtrl', {$state: $state});
  }));

  it('should transition to state', inject(function ($state) {
      $state.expectTransitionTo('incidents');
  }));

});

I welcome any suggestions or sample code that demonstrates how to properly test this $state.go functionality.

Answer №1

To successfully transition between states, it is important to monitor the state changes by spying on them. Below is an example code snippet that demonstrates how this can be achieved:

describe('Controller: homeCtrl', function () {
  beforeEach(module('incident'));
  var homeCtrl, $state;

  beforeEach(inject(function ($controller, _$state_) {
      $state = _$state_;
       spyOn('$state','go'); spyOn($state, 'go');
       // or
       spyOn($state, 'go').andCallFake(function(state, params) {
        // This replaces the 'go' functionality for the duration of your test
       });
      homeCtrl = $controller('homeCtrl', {$state: $state});
  }));

  it('should navigate to specific state', inject(function ($state) {
      $state.expectTransitionTo('incidents');
  }));

});

Answer №2

expectTransitionTo is not originally included in ui-router's functions. It appears that you may have come across it in this gist. In order to use this function, you will need to utilize that gist and configure the stateMock module as well.

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