Add code to FakeReposBase to revert changes committed by a unit tests.

Add code to FakeReposBase to revert changes committed by a unit tests.

This enables seamless unit tests that check-in files without side-effects on the
remaining unit tests.

BUG=none
TEST=none
TBR=dpranke

Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=73456

[Dirk Pranke, 2011-02-01 05:18:34]

What's the point of the SHOULD_LEAK option?

[M-A Ruel, 2011-02-01 14:38:13]

On 2011/02/01 05:18:34, dpranke wrote:
> What's the point of the SHOULD_LEAK option?

From line 211:
  # Should leak the repositories.
  SHOULD_LEAK = False

It means that the temporary repositories generated for the SCM integration tests
are not deleted after the test. That will cause inter-tests issues so only one
test should be run with that flag. That makes debugging the test possible since
I can inspect the state of the checkout.

[M-A Ruel, 2011-02-02 15:44:20]

Also TBR'ing this one since the new unit tests in the commit queue depends on
it.