def test_explicit_timer(capsys):
"""Test that timed section prints timing information"""
t = Timer(TIME_MESSAGE, logger=print)
t.start()
sum(n**2 for n in range(1000))
t.end()
stdout, stderr = capsys.readouterr()
assert RE_TIME_MESSAGE.match(stdout)
assert stdout.count("\n") == 1
assert stderr == ""
def test_error_if_timer_not_running():
"""Test that timer raises error if it is stopped before started"""
t = Timer(TIME_MESSAGE, logger=print)
with pytest.raises(exceptions.TimerNotRunning):
t.end()