Function test_add_columns

tests/test_data_table.py:294–300

()

async def test_add_columns():
    app = DataTableApp()
    async with app.run_test():
        table = app.query_one(DataTable)
        column_keys = table.add_columns("1", "2", "3")
        assert len(column_keys) == 3
        assert len(table.columns) == 3


async def test_add_columns_with_tuples():