How to use test_check_types_optional_out method in pandera

Best Python code snippet using pandera_python

test_decorators.py

Source:test_decorators.py

...469        transform(df)470    except errors.SchemaError as exc:471        assert exc.schema == OutSchema.to_schema()472        assert exc.data.equals(df)473def test_check_types_optional_out() -> None:474    """Test the check_types behaviour when the output schema is Optional."""475    @check_types476    def optional_derived_out(477        df: DataFrame[InSchema],  # pylint: disable=unused-argument478    ) -> typing.Optional[DataFrame[DerivedOutSchema]]:479        return None480    df = pd.DataFrame({"a": [1]}, index=["1"])481    assert optional_derived_out(df) is None482    @check_types483    def optional_out(484        df: DataFrame[InSchema],  # pylint: disable=unused-argument485    ) -> typing.Optional[DataFrame[OutSchema]]:486        return None487    df = pd.DataFrame({"a": [1]}, index=["1"])...

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