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import pytest
import random
from numpy.core._multiarray_tests import identityhash_tester
@pytest.mark.parametrize("key_length", [1, 3, 6])
@pytest.mark.parametrize("length", [1, 16, 2000])
def test_identity_hashtable(key_length, length):
# use a 30 object pool for everything (duplicates will happen)
pool = [object() for i in range(20)]
keys_vals = []
for i in range(length):
keys = tuple(random.choices(pool, k=key_length))
keys_vals.append((keys, random.choice(pool)))
dictionary = dict(keys_vals)
# add a random item at the end:
keys_vals.append(random.choice(keys_vals))
# the expected one could be different with duplicates:
expected = dictionary[keys_vals[-1][0]]
res = identityhash_tester(key_length, keys_vals, replace=True)
assert res is expected
# check that ensuring one duplicate definitely raises:
keys_vals.insert(0, keys_vals[-2])
with pytest.raises(RuntimeError):
identityhash_tester(key_length, keys_vals)