Alexander Larsson d9b9f3ddbd Add tests for the changes detection code
This adds 3 tests:

Verify that ChangesDirs() returns nothing when run on a copy of the
same directory.

Verify that various mutations of a directory get reported with the
right changes.

Verify that ExportChanges() + ApplyLayer() of the above mutation gets
an identical directory.

Unfortunately the last test is disabled because it fails in multiple
ways atm. But I want to get it in so that we can fix it.
Upstream-commit: f7238f94e8b5b31e78360c342676ca84b5984806
Component: engine
2013-11-15 09:49:46 +01:00
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