Add a couple more adb shell regression tests.

        result = adb.shell("sh -c 'echo hello; echo world'").splitlines()

        self.assertEqual(["hello", "world"], result)

        # http://b/15479704

        self.assertEqual('t', adb.shell("'true && echo t'").strip())

        self.assertEqual('t', adb.shell("sh -c 'true && echo t'").strip())

class AdbFile(unittest.TestCase):

    SCRATCH_DIR = "/data/local/tmp"