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Viewing changes to bzrlib/tests/test_pack_repository.py

add the failing acceptance test for the first portion.

When going through 'get_parent_map', if the index is missing, we should have
reloaded the index list without the calling code needing to know anything.

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Lines of Context:
bzrlib/tests/test_pack_repository.py
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        finally:
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            r1.unlock()
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    def test_concurrent_pack_triggers_reload(self):
 
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        # create 2 packs, which we will then collapse
 
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        tree = self.make_branch_and_tree('tree')
 
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        rev1 = tree.commit('one')
 
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        rev2 = tree.commit('two')
 
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        r1 = tree.branch.repository
 
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        r2 = repository.Repository.open('tree')
 
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        r1.lock_write()
 
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        try:
 
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            r2.lock_read()
 
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            try:
 
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                # Now r2 has read the pack-names file, but will need to reload
 
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                # it after r1 has repacked
 
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                r1.pack()
 
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                self.assertEqual({rev2:(rev1,)},
 
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                                 r2.get_parent_map([rev2]))
 
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            finally:
 
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                r2.unlock()
 
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        finally:
 
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            r1.unlock()
 
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    def test_lock_write_does_not_physically_lock(self):
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        repo = self.make_repository('.', format=self.get_format())
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        repo.lock_write()