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"""Testing the utils module."""
# Author: Trevor Stephens <trevorstephens.com>
#
# License: BSD 3 clause
import numpy as np
import pytest
from gplearn.utils import _get_n_jobs, check_random_state, cpu_count
def test_check_random_state():
"""Check the check_random_state utility function behavior"""
assert(check_random_state(None) is np.random.mtrand._rand)
assert(check_random_state(np.random) is np.random.mtrand._rand)
rng_42 = np.random.RandomState(42)
assert(check_random_state(42).randint(100) == rng_42.randint(100))
rng_42 = np.random.RandomState(42)
assert(check_random_state(rng_42) is rng_42)
rng_42 = np.random.RandomState(42)
assert(check_random_state(43).randint(100) != rng_42.randint(100))
with pytest.raises(ValueError):
check_random_state("some invalid seed")
def test_get_n_jobs():
"""Check that _get_n_jobs returns expected values"""
jobs = _get_n_jobs(4)
assert(jobs == 4)
jobs = -2
expected = cpu_count() + 1 + jobs
jobs = _get_n_jobs(jobs)
assert(jobs == expected)
with pytest.raises(ValueError):
_get_n_jobs(0)
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