what is wrong with this test error?

phone_loop_checker.py::TestPhoneLoop::test_valid
fail
0 / 1
c_helper.py:125: in _t
    stdout, stderr, returncode = self._run_exec(args=args, input_=input_, timeout=timeout)
c_helper.py:85: in _run_exec
    return _exec([os.path.join(".", self.executable_name)] + (args or []), **kwargs)
c_helper.py:475: in _exec
    raise e from e
c_helper.py:471: in _exec
    stdout, stderr = proc.communicate(timeout=timeout, input=input_)
/local/packages/python-3.10/lib/python3.10/subprocess.py:1152: in communicate
    stdout, stderr = self._communicate(input, endtime, timeout)
/local/packages/python-3.10/lib/python3.10/subprocess.py:2004: in _communicate
    self._check_timeout(endtime, orig_timeout, stdout, stderr)
/local/packages/python-3.10/lib/python3.10/subprocess.py:1196: in _check_timeout
    raise TimeoutExpired(
E   subprocess.TimeoutExpired: Command '['./phone_loop']' timed out after 2 seconds