[PATCH] msxml3/tests: Add mxwriter DOMDocument test.

[Jefferson Carpenter]

On 1/20/2021 7:14 AM, Nikolay Sivov wrote:
> 
> 
> I think the question is whether MXWriter explicitly supports document
> for output, or if it's simply a case of document not exposing IStream,
> see [1].
> 
> [1] https://bugs.winehq.org/show_bug.cgi?id=4811
> <https://bugs.winehq.org/show_bug.cgi?id=4811>
> 

That could be the case.  I could write a class that implements IStream 
and IDispatch and pass it in the V_DISPATCH slot to put_output and see 
how it's used.

I was just going by the msdn page that says the IMXWriter output 
property can be set to either an IStream, a string, or a DOMDocument 
object [1]

Strangely - and I don't understand this - if I cast the IXMLDOMDocument 
to an IDispatch (patch) or query for IDispatch, the test succeeds on 
Windows, but if I query for IStream and cast to IDispatch it does not. 
I should probably query for IDispatch in the patch so that it doesn't 
perform unnecessary casting.

[1] 
https://docs.microsoft.com/en-us/previous-versions/windows/desktop/ms755493(v=vs.85)