Updated tests

 - Moved from series/indexing/test_indexing to indexing/test_scalar
 - Added unit tests for loc get/set
 - Added GH issue number as comment in tests

Author: rhshadrach

pandas/tests/indexing/test_scalar.py

@@ -4,6 +4,7 @@
 import numpy as np
 import pytest
 
+import pandas as pd
 from pandas import DataFrame, Series, Timedelta, Timestamp, date_range
 import pandas._testing as tm
 from pandas.tests.indexing.common import Base
@@ -302,3 +303,29 @@ def test_iat_dont_wrap_object_datetimelike():
         assert result is ser2[1]
         assert isinstance(result, timedelta)
         assert not isinstance(result, Timedelta)
+
+
+def test_multiindex_series_loc_get():
+    series = pd.Series([1, 2], index=[[1, 2], [3, 4]])
+    assert series.loc[1, 3] == 1
+
+
+def test_multiindex_series_loc_set():
+    series = pd.Series([1, 2], index=[[1, 2], [3, 4]])
+    series.loc[1, 3] = 3
+    assert series.loc[1, 3] == 3
+
+
+def test_multiindex_series_at_get():
+    # GH 26989
+    # Series with multiindex at getter raises TypeError
+    series = pd.Series([1, 2], index=[[1, 2], [3, 4]])
+    assert series.at[1, 3] == 1
+
+
+def test_multiindex_series_at_set():
+    # GH 26989
+    # Series with multiindex at setter raises ValueError
+    series = pd.Series([1, 2], index=[[1, 2], [3, 4]])
+    series.at[1, 3] = 3
+    assert series.at[1, 3] == 3

pandas/tests/series/indexing/test_indexing.py

@@ -923,14 +923,3 @@ def test_getitem_2d_no_warning():
     series = pd.Series([1, 2, 3], index=[1, 2, 3])
     with tm.assert_produces_warning(None):
         series[:, None]
-
-
-def test_multiindex_at_get():
-    series = pd.Series([1, 2], index=[[1, 2], [3, 4]])
-    assert series.at[1, 3] == 1
-
-
-def test_multiindex_at_set():
-    series = pd.Series([1, 2], index=[[1, 2], [3, 4]])
-    series.at[1, 3] = 3
-    assert series.at[1, 3] == 3