How can I get wstring_convert::to_bytes to throw a range_error exception?

I am using std::wstring_convert to convert a wstring into a multibyte string as follows:

    // convert from wide char to multibyte char
    try
    {
        return std::wstring_convert<std::codecvt_utf8<wchar_t>>().to_bytes(wideMessage);
    }

    // thrown by std::wstring_convert.to_bytes() for bad conversions
    catch (std::range_error& exception)
    {
        // do something...
    }

In order to unit test the block I have commented as do something... I wish to pass a wstring that will throw a std::range_error exception.

However, I have not been able to formulate such a wstring that will fail such a conversion. The wstring will use UTF16 and I have been reading about high and low surrogates. For example, a UTF16 character of D800 followed by "b" should be invalid. std::wstring(L"\xd800\b"); fails to compile on the same grounds possibly. If I create a wstring such as below it will not throw the exception on conversion:

std::wstring wideMessage(L" b");
wideMessage[0] = L'\xd800';

// doesn't throw
std::wstring_convert<std::codecvt_utf8<wchar_t>>().to_bytes(wideMessage);

Is there a suitable wstring I can use to throw an exception during the conversion?