_____________________ [doctest] real-time-simulations.rst ______________________
041    >>>
042    >>> env = simpy.Environment()
043    >>> proc = env.process(example(env))
044    >>> env.run(until=proc)
045    Duration of one simulation time unit: 0.00s
046    >>>
047    >>> import simpy.rt
048    >>> env = simpy.rt.RealtimeEnvironment(factor=0.1)
049    >>> proc = env.process(example(env))
050    >>> env.run(until=proc)
Expected:
Duration of one simulation time unit: 0.10s
Got:
Duration of one simulation time unit: 0.11s
/private/tmp/nix-build-python3.7-simpy-4.0.1.drv-0/simpy-4.0.1/docs/topical_guides/real-time-simulations.rst:50: DocTestFailure
__________________________ test_rt_slow_sim_no_error ___________________________

log = [1]
    def test_rt_slow_sim_no_error(log):
        """Test ignoring slow simulations."""
        start = monotonic()
        env = RealtimeEnvironment(factor=0.05, strict=False)
        env.process(process(env, log, 0.1, 1))

        env.run(2)
        duration = monotonic() - start

>       assert check_duration(duration, 2 * 0.1)
E       assert False
E        +  where False = check_duration(0.2203596250000004, (2 * 0.1))

tests/test_rt.py:81: AssertionError
=============================== warnings summary ===============================

docs/topical_guides/real-time-simulations.rst Exception ignored in: <generator object Car.run at 0x109d9f120>                                                                               Traceback (most recent call last):                                                                                                                                                            File "<doctest process_interaction.rst[6]>", line 13, in run                                                                                                                              NameError: name 'simpy' is not defined                                                                                                                                                      F                          [ 10%]