def METHOD_NAME(spike_test_pair):
    data = spike_test_pair
    t = data[:, 0]
    v = data[:, 1]
    peaks = np.array([812, 3478])
    troughs = np.array([1089, 3741])
    expected_downstrokes = np.array([862, 3532])
    assert np.allclose(spkd.find_downstroke_indexes(v, t, peaks, troughs), expected_downstrokes)