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bzrlib/tests/matchers.py
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    'MatchesAncestry',
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    'ContainsNoVfsCalls',
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    'ReturnsUnlockable',
 
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    'RevisionHistoryMatches',
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    ]
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from bzrlib import (
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        return Equals(entries).match(actual)
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class RevisionHistoryMatches(Matcher):
 
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    """A matcher that checks if a branch has a specific revision history.
 
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    :ivar history: Revision history, as list of revisions. Oldest first.
 
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    """
 
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    def __init__(self, history):
 
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        Matcher.__init__(self)
 
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        self.expected = history
 
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    def __str__(self):
 
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        return 'RevisionHistoryMatches(%r)' % self.expected
 
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    def match(self, branch):
 
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        branch.lock_read()
 
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        try:
 
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            graph = branch.repository.get_graph()
 
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            history = list(graph.iter_lefthand_ancestry(
 
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                branch.last_revision(), [_mod_revision.NULL_REVISION]))
 
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            history.reverse()
 
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        finally:
 
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            branch.unlock()
 
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        return Equals(self.expected).match(history)
 
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class _NoVfsCallsMismatch(Mismatch):
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    """Mismatch describing a list of HPSS calls which includes VFS requests."""
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