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# Authors: The MNE-Python contributors.
# License: BSD-3-Clause
# Copyright the MNE-Python contributors.
import numpy as np
import pytest
from numpy.testing import assert_array_equal, assert_equal
from mne.preprocessing import peak_finder
def test_peak_finder():
"""Test the peak detection method."""
# check for random data
rng = np.random.RandomState(42)
peak_inds, peak_mags = peak_finder(rng.randn(20))
assert_equal(peak_inds.dtype, np.dtype("int64"))
assert_equal(peak_mags.dtype, np.dtype("float64"))
# check for empty array as created in the #5025
with pytest.raises(ValueError):
peak_finder(np.arange(2, 1, 0.05))
# check for empty array
with pytest.raises(ValueError):
peak_finder([])
# check for monotonic function
peak_inds, peak_mags = peak_finder(np.arange(1, 2, 0.05))
assert_equal(peak_inds.dtype, np.dtype("int64"))
assert_equal(peak_mags.dtype, np.dtype("float64"))
# check for no peaks
peak_inds, peak_mags = peak_finder(np.zeros(20))
assert_equal(peak_inds.dtype, np.dtype("int64"))
assert_equal(peak_mags.dtype, np.dtype("float64"))
# check values
peak_inds, peak_mags = peak_finder([0, 2, 5, 0, 6, -1])
assert_array_equal(peak_inds, [2, 4])
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