userController.js

describe('User controller', () => {

  let userService, userCtrl;

  beforeEach(inject((_userService_, $controller) => {
    userService = _userService_;
    userCtrl = $controller(UserCtrl, {
      user: {
        name: 'Barbara'
      }
    });
  }));

  it('should update user', () => {
    spyOn(userService, 'update');

    userCtrl.user.name = 'Sarah';
    userCtrl.save();

    expect(userService.update).toHaveBeenCalled();
  });
});