Counting Bugs in Windows Calculator(habr.com)

    TEST_METHOD(TestSwitchAndReselectCurrentlyActiveValueDoesNothing)
    {
      // *snip*
      vm.Value2Active = true;
      // Establish base condition
      VERIFY_ARE_EQUAL((UINT)1, mock->m_switchActiveCallCount);
      VERIFY_ARE_EQUAL((UINT)1, mock->m_sendCommandCallCount);
      VERIFY_ARE_EQUAL((UINT)1, mock->m_setCurUnitTypesCallCount);
      vm.Value2Active = true;
      VERIFY_ARE_EQUAL((UINT)1, mock->m_switchActiveCallCount);
      VERIFY_ARE_EQUAL((UINT)1, mock->m_sendCommandCallCount);
      VERIFY_ARE_EQUAL((UINT)1, mock->m_setCurUnitTypesCallCount);
    }

    public ref class UnitConverterViewModel sealed: public Windows::UI::Xaml::Data::INotifyPropertyChanged
    {
        // other members omitted
        OBSERVABLE_OBJECT();
        OBSERVABLE_PROPERTY_RW(bool, Value2Active);
    };