Add TreeView property tests

[hughbe]

No description provided.

[RussKie]

Top job!
I glanced over the tests, for the most part they looked good with exception for the comment I left about arrangements.

I'll need more time to go though all 3.5K lines code in greater details.

[danmoseley]

@RussKie I see you are a committer now - great! I'll let you own this one then 😺

[RussKie]

👍

[RussKie]

Do you wish squash yourself or me to squash-merge?

[RussKie]

This change is actually breaking the tests

[RussKie]

It looks like debug and release builds yield different results... This is wwird

[hughbe]

Any idea why that would be the case? Maybe it depends on the machine?

[RussKie]

Not quite sure at this stage. I will have to dig deeper into it.

[AdamYoblick]

When running the tests locally, debug (.\build -test) fails while release (.\build -test -configuration Release) passes. I didn't step through the code, but it's reproable locally. @hughbe can you please try to step through in debug and see what you find?

Thanks :)

[hughbe]

Great! I fixed the tests :)

[weltkante]

@hughbe the fixes seem to weaken the tests significantly, as it no longer tests that the user provided values are preserved. I see that its probably happening outside the WinForms codebase in the native control, but do you have any explanation why Indent and ItemHeight should not preserve the user specified values? Is this always the case or only under certain conditions? If its the latter, it would probably be worth to also have tests for the "common" cases where the user defined values are to be preserved.