test: deduplication

[cmp0xff]

After #1456, there is an issue that can be improved in the tests.

The following two parts are duplicated, because data, idx and dt_idx are all DatetimeIndexes. The second part can be removed. Also see the link in TODO.

pandas-stubs/tests/indexes/test_datetime_index.py

Lines 26 to 48 in 84f8d36

	idx = check(
	assert_type(pd.Index(data, name="date"), pd.DatetimeIndex), pd.DatetimeIndex
	)
	check(assert_type(data[x <= idx], pd.DatetimeIndex), pd.DatetimeIndex)
	check(assert_type(data[x < idx], pd.DatetimeIndex), pd.DatetimeIndex)
	check(assert_type(data[x >= idx], pd.DatetimeIndex), pd.DatetimeIndex)
	check(assert_type(data[x > idx], pd.DatetimeIndex), pd.DatetimeIndex)
	check(assert_type(data[idx <= x], pd.DatetimeIndex), pd.DatetimeIndex)
	check(assert_type(data[idx < x], pd.DatetimeIndex), pd.DatetimeIndex)
	check(assert_type(data[idx >= x], pd.DatetimeIndex), pd.DatetimeIndex)
	check(assert_type(data[idx > x], pd.DatetimeIndex), pd.DatetimeIndex)
	# TODO: https://github.com/pandas-dev/pandas-stubs/pull/1438#discussion_r2451864012
	# Can this be de-duplicated?
	dt_idx = pd.DatetimeIndex(data, name="date")
	check(assert_type(data[x <= dt_idx], pd.DatetimeIndex), pd.DatetimeIndex)
	check(assert_type(data[x < dt_idx], pd.DatetimeIndex), pd.DatetimeIndex)
	check(assert_type(data[x >= dt_idx], pd.DatetimeIndex), pd.DatetimeIndex)
	check(assert_type(data[x > dt_idx], pd.DatetimeIndex), pd.DatetimeIndex)
	check(assert_type(data[dt_idx <= x], pd.DatetimeIndex), pd.DatetimeIndex)
	check(assert_type(data[dt_idx < x], pd.DatetimeIndex), pd.DatetimeIndex)
	check(assert_type(data[dt_idx >= x], pd.DatetimeIndex), pd.DatetimeIndex)
	check(assert_type(data[dt_idx > x], pd.DatetimeIndex), pd.DatetimeIndex)

[harshasiddartha]

@cmp0xff can you review and merge my pr I have solved this issue