TST/API: related GH5614, groupby.cumsum returned frames

Author: jreback

pandas/tests/test_groupby.py

@@ -2030,13 +2030,19 @@ def test_non_cython_api(self):
         assert_frame_equal(result,expected)
 
         # cumsum (GH5614)
-        df = DataFrame([[1, 2, np.nan], [1, np.nan, 9], [3, 4, 9]], columns=['A', 'B', 'C'])
-        expected = DataFrame([[2, np.nan], [np.nan, 9], [4, 9]], columns=['B', 'C'])
-        result = df.groupby('A').cumsum()
+        df = DataFrame([[1, 2, np.nan], [1, np.nan, 9], [1, 1, 2 ], [3, 4, 9]], columns=['A', 'B', 'C'])
+        import pdb; pdb.set_trace()
+        expected = DataFrame([[2, np.nan], [np.nan,9], [3, 11], [4, 9]],
+                             columns=['B', 'C'],
+                             index=MultiIndex.from_tuples([(1,0),(1,1),(1,2),(3,0)],names=['A',None]))
+        g = df.groupby('A')
+        result = g.cumsum()
         assert_frame_equal(result,expected)
 
-        expected = DataFrame([[1, 2, np.nan], [2, np.nan, 9], [3, 4, 9]], columns=['A', 'B', 'C']).astype('float64')
-        result = df.groupby('A', as_index=False).cumsum()
+        expected = DataFrame([[1, 2, np.nan], [2, np.nan, 9], [3, 3, 11], [3, 4, 9]],
+                             columns=['A', 'B', 'C'])
+        g = df.groupby('A', as_index=False)
+        result = g.cumsum()
         assert_frame_equal(result,expected)
 
     def test_grouping_ndarray(self):