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import pytest
from networkx.utils import (
powerlaw_sequence,
random_weighted_sample,
weighted_choice,
zipf_rv,
)
def test_degree_sequences():
seq = powerlaw_sequence(10, seed=1)
seq = powerlaw_sequence(10)
assert len(seq) == 10
def test_zipf_rv():
r = zipf_rv(2.3, xmin=2, seed=1)
r = zipf_rv(2.3, 2, 1)
r = zipf_rv(2.3)
assert type(r), int
pytest.raises(ValueError, zipf_rv, 0.5)
pytest.raises(ValueError, zipf_rv, 2, xmin=0)
def test_random_weighted_sample():
mapping = {"a": 10, "b": 20}
s = random_weighted_sample(mapping, 2, seed=1)
s = random_weighted_sample(mapping, 2)
assert sorted(s) == sorted(mapping.keys())
pytest.raises(ValueError, random_weighted_sample, mapping, 3)
def test_random_weighted_choice():
mapping = {"a": 10, "b": 0}
c = weighted_choice(mapping, seed=1)
c = weighted_choice(mapping)
assert c == "a"
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