am 332c2881: Merge "Make the root/unroot test more robust."

                version_num = True

        self.assertTrue(version_num)

    def test_root_unroot(self):

        """Make sure that adb root and adb unroot work, using id(1)."""

    def _test_root(self):

        adb = AdbWrapper()

        adb.root()

        adb.wait()

        self.assertEqual("root", adb.shell("id -un").strip())

    def _test_unroot(self):

        adb = AdbWrapper()

        adb.unroot()

        adb.wait()

        self.assertEqual("shell", adb.shell("id -un").strip())

    def test_root_unroot(self):

        """Make sure that adb root and adb unroot work, using id(1)."""

        adb = AdbWrapper()

        original_user = adb.shell("id -un").strip()

        try:

            if original_user == "root":

                self._test_unroot()

                self._test_root()

            elif original_user == "shell":

                self._test_root()

                self._test_unroot()

        finally:

            if original_user == "root":

                adb.root()

            else:

                adb.unroot()

            adb.wait()

class AdbFile(unittest.TestCase):

    SCRATCH_DIR = "/data/local/tmp"