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bzrlib/tests/__init__.py
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        real branch.
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        """
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        root = TestCaseWithMemoryTransport.TEST_ROOT
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        bzrdir.BzrDir.create_standalone_workingtree(root)
 
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        wt = bzrdir.BzrDir.create_standalone_workingtree(root)
 
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        # Hack for speed: remember the raw bytes of the dirstate file so that
 
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        # we don't need to re-open the wt to check it hasn't changed.
 
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        TestCaseWithMemoryTransport._SAFETY_NET_PRISTINE_DIRSTATE = (
 
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            wt.control_transport.get_bytes('dirstate'))
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    def _check_safety_net(self):
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        """Check that the safety .bzr directory have not been touched.
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        propagating. This method ensures than a test did not leaked.
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        """
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        root = TestCaseWithMemoryTransport.TEST_ROOT
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        self.permit_url(_mod_transport.get_transport(root).base)
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        wt = workingtree.WorkingTree.open(root)
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        last_rev = wt.last_revision()
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        if last_rev != 'null:':
 
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        t = _mod_transport.get_transport(root)
 
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        self.permit_url(t.base)
 
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        if (t.get_bytes('.bzr/checkout/dirstate') != 
 
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                TestCaseWithMemoryTransport._SAFETY_NET_PRISTINE_DIRSTATE):
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            # The current test have modified the /bzr directory, we need to
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            # recreate a new one or all the followng tests will fail.
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            # If you need to inspect its content uncomment the following line