def test_start_stop_elapsed():
watch = time.StopWatch()
watch.start()
watch.stop()
e = watch.elapsed()
assert e > 0
watch.start()
assert watch.elapsed() != e
def test_context_manager():
with time.StopWatch() as watch:
pass
assert watch.elapsed() > 0
def test_elapsed():
watch = time.StopWatch()
watch.start()
watch.stop()
assert watch.elapsed() > 0
def test_no_elapsed():
watch = time.StopWatch()
with pytest.raises(RuntimeError):
watch.elapsed()
def test_start_stop():
watch = time.StopWatch()
watch.start()
watch.stop()
def test_no_states():
watch = time.StopWatch()
with pytest.raises(RuntimeError):
watch.stop()
