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How to use test_duplicate_columns_dataframe method in pandera

Best Python code snippet using pandera_python

test_schemas.py

Source:test_schemas.py

...267    with pytest.raises(268        errors.SchemaErrors, match="A total of 1 schema errors"269    ):270        schema.validate(df, lazy=True)271def test_duplicate_columns_dataframe():272    """Test that duplicate columns are detected."""273    col_labels = ["a", "a", "b"]274    frame = pd.DataFrame(data=[[1, 2, 3]], columns=col_labels)275    schema = DataFrameSchema(276        columns={i: Column(int) for i in col_labels},277        unique_column_names=True,278    )279    assert schema.unique_column_names280    with pytest.raises(281        errors.SchemaError,282        match="dataframe contains multiple columns with label",283    ):284        schema.validate(frame)285    schema.unique_column_names = False...

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