TST: move index tests to correct files (#27045)

pandas/tests/tseries/offsets/test_business_month.py

@@ -7,6 +7,7 @@
 
 import pytest
 
+import pandas as pd
 from pandas.tests.tseries.offsets.common import (
     Base,
     assert_is_on_offset,
@@ -19,6 +20,29 @@
 )
 
 
+@pytest.mark.parametrize("n", [-2, 1])
+@pytest.mark.parametrize(
+    "cls",
+    [
+        BMonthBegin,
+        BMonthEnd,
+    ],
+)
+def test_apply_index(cls, n):
+    offset = cls(n=n)
+    rng = pd.date_range(start="1/1/2000", periods=100000, freq="T")
+    ser = pd.Series(rng)
+
+    res = rng + offset
+    assert res.freq is None  # not retained
+    assert res[0] == rng[0] + offset
+    assert res[-1] == rng[-1] + offset
+    res2 = ser + offset
+    # apply_index is only for indexes, not series, so no res2_v2
+    assert res2.iloc[0] == ser.iloc[0] + offset
+    assert res2.iloc[-1] == ser.iloc[-1] + offset
+
+
 class TestBMonthBegin(Base):
     _offset = BMonthBegin
 

pandas/tests/tseries/offsets/test_yqm_offsets.py → pandas/tests/tseries/offsets/test_index.py

@@ -1,9 +1,12 @@
 """
-Tests for Year, Quarter, and Month-based DateOffset subclasses
+Tests for offset behavior with indices.
 """
 import pytest
 
-import pandas as pd
+from pandas import (
+    Series,
+    date_range,
+)
 
 from pandas.tseries.offsets import (
     BMonthBegin,
@@ -41,8 +44,8 @@
 )
 def test_apply_index(cls, n):
     offset = cls(n=n)
-    rng = pd.date_range(start="1/1/2000", periods=100000, freq="T")
-    ser = pd.Series(rng)
+    rng = date_range(start="1/1/2000", periods=100000, freq="T")
+    ser = Series(rng)
 
     res = rng + offset
     assert res.freq is None  # not retained