import numpy as np

from pandas import MultiIndex, NaT, Series, date_range
import pandas.testing as tm


class TestSetitemDT64Values:
    def test_setitem_none_nan(self):
        series = Series(date_range("1/1/2000", periods=10))
        series[3] = None
        assert series[3] is NaT

        series[3:5] = None
        assert series[4] is NaT

        series[5] = np.nan
        assert series[5] is NaT

        series[5:7] = np.nan
        assert series[6] is NaT

    def test_setitem_multiindex_empty_slice(self):
        # https://github.com/pandas-dev/pandas/issues/35878
        idx = MultiIndex.from_tuples([("a", 1), ("b", 2)])
        result = Series([1, 2], index=idx)
        expected = result.copy()
        result.loc[[]] = 0
        tm.assert_series_equal(result, expected)