text: it('should change state', function() {
    var value1 = element(by.binding('checkboxModel.value1'));
    var value2 = element(by.binding('checkboxModel.value2'));
  
    expect(value1.getText()).toContain('true');
    expect(value2.getText()).toContain('YES');
  
    element(by.model('checkboxModel.value1')).click();
    element(by.model('checkboxModel.value2')).click();
  
    expect(value1.getText()).toContain('false');
    expect(value2.getText()).toContain('NO');
  });