def METHOD_NAME():
    N = 10
    def check_fraction(timer, ft):
        # The running fraction should be approximately equal to the
        # sum of last N "measurement" intervals over the sum of last
        # 2N intervals (not 2N - 1 or 2N + 1)
        actual = ft.running_fraction
        expected = sum(timer.durations[1][-N:]) / (
            sum(timer.durations[0][-N:] + timer.durations[1][-N:])
        )
        assert actual == pytest.approx(expected)
    timer = RandomTimer()
    ft = FractionalTimer(n_samples=N, timer=timer)
    for _ in range(N):
        ft.start_timing()
        ft.stop_timing()
    assert len(timer.timings) == N * 2
    assert ft.running_fraction is None
    ft.start_timing()
    ft.stop_timing()
    assert len(timer.timings) == (N + 1) * 2
    assert ft.running_fraction is not None
    check_fraction(timer, ft)
    for _ in range(N * 10):
        ft.start_timing()
        ft.stop_timing()
        check_fraction(timer, ft)