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import pytest
from pydantic_core import SchemaSerializer, core_schema
def test_nullable():
s = SchemaSerializer(core_schema.nullable_schema(core_schema.int_schema()))
assert s.to_python(None) is None
assert s.to_python(1) == 1
assert s.to_python(None, mode='json') is None
assert s.to_python(1, mode='json') == 1
assert s.to_json(1) == b'1'
assert s.to_json(None) == b'null'
with pytest.warns(
UserWarning,
match=r"Expected `int` - serialized value may not be as expected \[input_value='aaa', input_type=str\]",
):
assert s.to_json('aaa') == b'"aaa"'
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