[MERGE] TestCaseWithMemoryTransport

[John Arbash Meinel]

Robert Collins wrote:
> This patch add TestCaseWithMemoryTransport, a base class between
> TestCase and TestCaseInTempDir.
> 
> It does not setup per-test test directories, and calls to get_transport
> always get MemoryTransport. it does not have make_branch_and_tree,
> rather it has make_branch_and_memory_tree() only, allowing this to be
> used for very fast precise tests.
> 
> -Rob

If it isn't setting up per-test directories, what HOME does it use?

One bug that we have, is that any test that might modify ~/.bazaar/*
must use TestCaseInTempDir so that it gets a unique HOME, otherwise we
use 'cwd' which is usually the root of the bzr tree.

We *could* have bzrlib.tests.TestCase always create the test000X.tmp
directory, and set $HOME in there. But you still have the problem that
multiple runs will re-use the same $HOME.

Anyway, I think we do need to create the test specific directories,
because of potential issues with $HOME.

(Remember, wt.is_ignored() has the ultimate side effect of creating
~/.bazaar/ignore if it doesn't exist)

John
=:->


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