added test case for issue pandas-dev#43599

Author: gamenerd457

pandas/tests/indexing/test_loc.py

@@ -38,6 +38,7 @@
 from pandas.api.types import is_scalar
 from pandas.core.api import Float64Index
 from pandas.tests.indexing.common import Base
+import unittest
 
 
 class TestLoc(Base):
@@ -2833,7 +2834,7 @@ def test_loc_assign_dict_to_row(self, dtype):
 
     @td.skip_array_manager_invalid_test
     def test_loc_setitem_dict_timedelta_multiple_set(self):
-        # GH 16309
+        # GH 16309s
         result = DataFrame(columns=["time", "value"])
         result.loc[1] = {"time": Timedelta(6, unit="s"), "value": "foo"}
         result.loc[1] = {"time": Timedelta(6, unit="s"), "value": "foo"}
@@ -2857,3 +2858,15 @@ def test_loc_set_multiple_items_in_multiple_new_columns(self):
         )
 
         tm.assert_frame_equal(df, expected)
+
+
+class TestLoc3(unittest.TestCase): #test case for issue #43599
+    def test_loc_multiindex(self):
+        df = pd.DataFrame(index=pd.MultiIndex.from_product([list('abc'), list('de'), list('f')]), columns=['Val'])
+        df1=df.loc[np.s_[:,'d',:]]
+        df2=pd.DataFrame(index=pd.MultiIndex.from_product([list('abc'), list('d'), list('f')]), columns=['Val'])
+
+        
+        tm.assert_frame_equal(df1,df2)
+
+