def test_monitor_multiple_start():
"""
Calling ``Monitor.start`` multiple times has no effects beyond those of
calling it once.
"""
monitor = Monitor(MagicMock())
monitor.timer = MagicMock()
monitor.start()
monitor.start()
assert monitor.timer.mock_calls == [call.start(2, now=True)]
def test_monitor_start():
monitor = Monitor(MagicMock())
monitor.timer = MagicMock()
monitor.start()
assert monitor.timer.mock_calls == [call.start(2, now=True)]