ionic-framework/hacking/TabBarController.unit.js

describe('TabBarController', function() {
  var ctrl;

  beforeEach(function() {
    ctrl = new TabBarController({
      tabBar: new TabBar()
    });
  })

  it('Should add Controllers', function() {
    ctrl.addController({
      title: 'Item 1'
    });

    expect(ctrl.getController(0).title).toEqual('Item 1');
  });

  it('Should set Controllers', function() {
    var Controllers = [
      { title: 'Item 1' },
      { title: 'Item 2' },
      { title: 'Item 3' },
    ];
    ctrl.setControllers(Controllers);

    expect(ctrl.getControllers()).toBe(Controllers);
  });

  it('Should select Controller', function() {
    Controller = {
      title: 'Item 1'
    };

    ctrl.addController(Controller);

    ctrl.selectController(0);

    expect(ctrl.getSelectedController()).toEqual(Controller);
  });

  it('Should trigger lifecycle methods', function() {
    Controller = {
      title: 'Item 1'
    };

    spyOn(ctrl, 'controllerWillChange');
    spyOn(ctrl, 'controllerChanged');

    ctrl.addController(Controller);
    ctrl.selectController(0);
    expect(ctrl.controllerWillChange).toHaveBeenCalled();
    expect(ctrl.controllerChanged).toHaveBeenCalled();
  });

  it('Should allow cancelling Controller switch', function() {
    ctrl = new TabBarController({
      tabBar: new TabBar(),
      controllerWillChange: function(Controller) { return false; }
    });

    ctrl.addController({
      title: 'Item 1'
    });
    ctrl.addController({
      title: 'Item 2'
    });
    ctrl.selectController(1);

    // Make sure the Controller didn't switch
    expect(ctrl.getSelectedController()).toBe(ctrl.getController(0));
  });

})