def METHOD_NAME(self):
    "Verify that we can read file descriptors handed to sandbox"
    p1 = Popen(['cat', '/etc/passwd'], stdout=PIPE)
    p2 = Popen([sys.executable, 'sandbox', 'grep', 'root'], stdin=p1.stdout, stdout=PIPE)
    p1.stdout.close()
    out, err = p2.communicate()
    self.assertTrue(b'root' in out)