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"""
Tests for SimPy's real-time behavior.
"""
import time
try:
# Python >= 3.3
from time import monotonic
except ImportError:
# Python < 3.3
from time import time as monotonic
import pytest
from simpy.rt import RealtimeEnvironment
def process(env, log, sleep, timeout=1):
"""Test process."""
while True:
time.sleep(sleep)
yield env.timeout(timeout)
log.append(env.now)
def check_duration(real, expected):
return expected <= real < (expected + 0.02)
@pytest.mark.parametrize('factor', [0.1, 0.05, 0.15])
def test_rt(log, factor):
"""Basic tests for run()."""
start = monotonic()
env = RealtimeEnvironment(factor=factor)
env.process(process(env, log, 0.01, 1))
env.process(process(env, log, 0.02, 1))
env.run(2)
duration = monotonic() - start
assert check_duration(duration, 2 * factor)
assert log == [1, 1]
def test_rt_multiple_call(log):
"""Test multiple calls to run()."""
start = monotonic()
env = RealtimeEnvironment(factor=0.05)
env.process(process(env, log, 0.01, 2))
env.process(process(env, log, 0.01, 3))
env.run(5)
duration = monotonic() - start
# assert almost_equal(duration, 0.2)
assert check_duration(duration, 5 * 0.05)
assert log == [2, 3, 4]
env.run(12)
duration = monotonic() - start
assert check_duration(duration, 12 * 0.05)
assert log == [2, 3, 4, 6, 6, 8, 9, 10]
def test_rt_slow_sim_default_behavior(log):
"""By default, SimPy should raise an error if a simulation is too
slow for the selected real-time factor."""
env = RealtimeEnvironment(factor=0.05)
env.process(process(env, log, 0.1, 1))
err = pytest.raises(RuntimeError, env.run, 3)
assert 'Simulation too slow for real time' in str(err.value)
assert log == []
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)
assert log == [1]
def test_rt_illegal_until():
"""Test illegal value for *until*."""
env = RealtimeEnvironment()
err = pytest.raises(ValueError, env.run, -1)
assert str(err.value) == ('until(=-1.0) should be > the current '
'simulation time.')
def test_rt_sync(log):
"""Test resetting the internal wall-clock reference time."""
env = RealtimeEnvironment(factor=0.05)
env.process(process(env, log, 0.01))
time.sleep(0.06) # Simulate massiv workload :-)
env.sync()
env.run(3)
def test_run_with_untriggered_event(env):
env = RealtimeEnvironment(factor=0.05)
excinfo = pytest.raises(RuntimeError, env.run, until=env.event())
assert str(excinfo.value).startswith('No scheduled events left but "until"'
' event was not triggered:')
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