[PATCH 2/6] uiautomationcore/tests: Skip UiaProviderFromIAccessible tests on Win10v1507.

Connor McAdams cmcadams at codeweavers.com
Tue Jun 7 10:29:12 CDT 2022

On Tue, Jun 07, 2022 at 04:13:45PM +0100, Huw Davies wrote:
> On Tue, Jun 07, 2022 at 11:02:31AM -0400, Connor McAdams wrote:
> > On Tue, Jun 07, 2022 at 10:07:22AM +0100, Huw Davies wrote:
> > > On Wed, May 25, 2022 at 02:37:35PM -0400, Connor McAdams wrote:
> > > > In Windows 10 version 1507, UiaProviderFromIAccessible will try to check
> > > > the IAccessible passed in against the root IAccessible of the HWND
> > > > associated with the passed in IAccessible. In all other Windows
> > > > versions, this check is done on a call to get_HostRawElementProvider, or
> > > > the first time navigating towards a parent or sibling. Rather than work
> > > > around this, just skip the tests if this happens.
> > > 
> > > Could we write the tests so that they don't rely on implementation
> > > details?  Presumably applications run correctly on Windows 10 v1507.
> > > 
> > > Huw.
> > 
> > So, essentially most of my tests for UI Automation kind of revolve
> > around things like SET_EXPECT/CHECK_EXPECT/CHECK_CALLED tests as a way
> > of testing what UI Automation does with the interfaces we pass into it.
> > This is similar to how the tests for oleacc are done. In this case, we'd
> > end up with a number of tests where we'd have to add a bunch of
> > SET_EXPECT's to account for one specific version of Windows, then we'd
> > need some sort of special CHECK_CALLED that could account for a broken
> > behavior. It's a lot more work than I think it's worth to work around a
> > bug in one specific version of Windows 10.
> Is it really a bug in Windows; it seems more like a different
> implementation?  How different are the call sequences?
> Huw.

I believe it's a bug, or at least a behavior that was undesirable.
All other versions of Windows seem to delay this root IAccessible check
until specific methods are called on the IRawElementProviderSimple
wrapper. The check is basically sending the HWND associated with an
IAccessible a WM_GETOBJECT message, and then the returned IAccessible is
compared against the currently wrapped one. This can end up with:


On both interfaces. This also causes issues when testing the methods
that trigger the same check on other versions of Windows, because if the
check is done immediately when UiaProviderFromIAccessible is called,
the check isn't done on the method calls, meaning we again have to work
around this.

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