[rfc] add a TestFactory class or concept

[Aaron Bentley]

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Alexander Belchenko wrote:
> Aaron Bentley пишет:
>> MemoryTree is not close enough to a real working tree for me to be
>> comfortable with it.  I don't trust it to do what I want, and I don't
>> trust it to be a good enough emulation of a working tree.  I'd rather
>> use a PreviewTree, since I know and trust the TreeTransform interface.
> 
> Aaron, I see you're always recommend to use PreviewTree and
> TreeTransform and it seems you think they both are the one right way for
> everyone.

I didn't mean that.  I was talking about my own comfort level.  I'm more
comfortable with the TreeTransform API than I am with MemoryTree.

I recognize that for many people, the TreeTransform API seems weird and
alien, so I don't think it's for everyone.

> But why you even don't comment on bug report about PreviewTree?
> https://bugs.launchpad.net/bzr/+bug/251532

I have fallen behind on reading bugs, so I was unaware of it.  There are
currently 7705 unread messages in my bzr bugs folder, which is pretty
daunting.

Aaron
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