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"""Tests for WorkingTree.revision_tree.
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These tests are in addition to the tests from
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all Trees. WorkingTrees implement the revision_tree api to allow access to
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cached data, but we don't require that all WorkingTrees have such a cache,
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so these tests are testing that when there is a cache, it performs correctly.
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from bzrlib import errors
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class TestRevisionTree(TestCaseWithWorkingTree):