def _output_manifest_project_extras(self, p, e):
    if p.old_revision:
        e.setAttribute('old-revision', str(p.old_revision))
Test get() with success.
dataset/ETHPy150Open esrlabs/git-repo/manifest_xml.py/GitcManifest._output_manifest_project_extras--crossover with--dataset/ETHPy150Open google/simian/src/tests/simian/mac/munki/handlers/uploadpkg_test.py/UploadPackageTest.testGetSuccess