def METHOD_NAME(self):
    cline = EchoApp(text="Hello World")
    tmp = "echo_stdout.tmp"
    if os.path.isfile(tmp):
        os.remove(tmp)
    tmp2 = "echo_stderr.tmp"
    if os.path.isfile(tmp2):
        os.remove(tmp2)
    stdout, stderr = cline(stdout=tmp, stderr=tmp2)
    self.assertIsNone(stderr)
    self.assertIsNone(stdout)
    self.assertTrue(os.path.isfile(tmp), tmp)
    with open(tmp) as handle:
        contents = handle.read()
    self.assertEqual(contents, "Hello World\n")  # stdout
    os.remove(tmp)
    self.assertTrue(os.path.isfile(tmp2), tmp2)
    with open(tmp2) as handle:
        contents = handle.read()
    self.assertEqual(contents, "")  # stderr
    os.remove(tmp2)