test_to_frame.py

from pandas import (
    DataFrame,
    Index,
    date_range,
)
import pandas._testing as tm


class TestToFrame:
    def test_to_frame_datetime_tz(self):
        # GH#25809
        idx = date_range(start="2019-01-01", end="2019-01-30", freq="D", tz="UTC")
        result = idx.to_frame()
        expected = DataFrame(idx, index=idx)
        tm.assert_frame_equal(result, expected)

    def test_to_frame_respects_none_name(self):
        # GH#44212 if we explicitly pass name=None, then that should be respected,
        #  not changed to 0
        # GH-45448 this is first deprecated to only change in the future
        idx = date_range(start="2019-01-01", end="2019-01-30", freq="D", tz="UTC")
        with tm.assert_produces_warning(FutureWarning):
            result = idx.to_frame(name=None)
        # exp_idx = Index([None], dtype=object)
        exp_idx = Index([0])
        tm.assert_index_equal(exp_idx, result.columns)

        with tm.assert_produces_warning(FutureWarning):
            result = idx.rename("foo").to_frame(name=None)
        exp_idx = Index(["foo"], dtype=object)
        tm.assert_index_equal(exp_idx, result.columns)