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bzrlib/versionedfile.py
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from bzrlib.lazy_import import lazy_import
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lazy_import(globals(), """
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from copy import deepcopy
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import unittest
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from bzrlib import (
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    errors,
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                    else:
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                        new_version_ids.add(version)
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                return new_version_ids
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class InterVersionedFileTestProviderAdapter(object):
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    """A tool to generate a suite testing multiple inter versioned-file classes.
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    This is done by copying the test once for each InterVersionedFile provider
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    and injecting the transport_server, transport_readonly_server,
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    versionedfile_factory and versionedfile_factory_to classes into each copy.
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    Each copy is also given a new id() to make it easy to identify.
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    """
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    def __init__(self, transport_server, transport_readonly_server, formats):
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        self._transport_server = transport_server
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        self._transport_readonly_server = transport_readonly_server
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        self._formats = formats
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    def adapt(self, test):
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        result = unittest.TestSuite()
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        for (interversionedfile_class,
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             versionedfile_factory,
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             versionedfile_factory_to) in self._formats:
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            new_test = deepcopy(test)
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            new_test.transport_server = self._transport_server
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            new_test.transport_readonly_server = self._transport_readonly_server
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            new_test.interversionedfile_class = interversionedfile_class
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            new_test.versionedfile_factory = versionedfile_factory
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            new_test.versionedfile_factory_to = versionedfile_factory_to
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            def make_new_test_id():
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                new_id = "%s(%s)" % (new_test.id(), interversionedfile_class.__name__)
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                return lambda: new_id
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            new_test.id = make_new_test_id()
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            result.addTest(new_test)
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        return result
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    @staticmethod
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    def default_test_list():
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        """Generate the default list of interversionedfile permutations to test."""
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        from bzrlib.weave import WeaveFile
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        from bzrlib.knit import KnitVersionedFile
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        result = []
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        # test the fallback InterVersionedFile from annotated knits to weave
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        result.append((InterVersionedFile, 
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                       KnitVersionedFile,
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                       WeaveFile))
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        for optimiser in InterVersionedFile._optimisers:
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            result.append((optimiser,
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                           optimiser._matching_file_from_factory,
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                           optimiser._matching_file_to_factory
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                           ))
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        # if there are specific combinations we want to use, we can add them 
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        # here.
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        return result