import pytest
from src.utils import filter_none_values
def test_filter_none_values_typical():
d = {'a': 1, 'b': None, 'c': 3, 'd': None}
assert filter_none_values(d) == {'a': 1, 'c': 3}
def test_filter_none_values_all_none():
d = {'a': None, 'b': None}
assert filter_none_values(d) == {}
def test_filter_none_values_no_none():
d = {'a': 0, 'b': '', 'c': False, 'd': []}
# 0, '', False, [] are not None, so should be kept
assert filter_none_values(d) == d
def test_filter_none_values_empty():
d = {}
assert filter_none_values(d) == {}
def test_filter_none_values_nested():
d = {'a': None, 'b': {'x': None}, 'c': [None, 1], 'd': 2}
# Only top-level None is removed
assert filter_none_values(d) == {'b': {'x': None}, 'c': [None, 1], 'd': 2}
def test_filter_none_values_does_not_mutate_input():
original = {'a': 1, 'b': None, 'c': 2}
copy = original.copy()
_ = filter_none_values(original)
assert original == copy, "filter_none_values should not mutate its input dict"
def test_filter_none_values_with_null_strings():
d = {'a': 1, 'b': None, 'c': 'null', 'd': 3, 'e': 'null'}
assert filter_none_values(d) == {'a': 1, 'd': 3}
def test_filter_none_values_mixed_none_and_null():
d = {'a': None, 'b': 'null', 'c': 'valid', 'd': 0, 'e': 'null', 'f': None}
assert filter_none_values(d) == {'c': 'valid', 'd': 0}
def test_filter_none_values_only_null_strings():
d = {'a': 'null', 'b': 'null', 'c': 'null'}
assert filter_none_values(d) == {}
def test_filter_none_values_preserves_valid_strings_containing_null():
d = {'a': 'null_value', 'b': 'not_null', 'c': 'null', 'd': None}
# Should only filter exact "null" strings, not strings containing "null"
assert filter_none_values(d) == {'a': 'null_value', 'b': 'not_null'}
