test_fileformat.py

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from typing import Any

import pytest

from pyiceberg.io.fileformat import DataFileStatistics, FileFormatWriter


def test_backward_compat_import() -> None:
    """DataFileStatistics can still be imported from pyiceberg.io.pyarrow."""
    from pyiceberg.io.fileformat import DataFileStatistics as dFS  # noqa: F401
    from pyiceberg.io.pyarrow import DataFileStatistics  # noqa: F401

    assert DataFileStatistics is dFS


def test_result_before_close_raises() -> None:
    """Calling result before close should raise an error."""

    class _DummyWriter(FileFormatWriter):
        def write(self, table: Any) -> None:
            pass

        def close(self) -> DataFileStatistics:
            raise NotImplementedError

    writer = _DummyWriter()
    with pytest.raises(RuntimeError, match="Writer has not been closed yet"):
        writer.result()