Fix failing tests, due to change in behaviour

Author: Sumanau Sareen

pandas/tests/indexing/test_partial.py

@@ -454,7 +454,7 @@ def test_partial_set_empty_frame(self):
         expected = DataFrame(columns=['foo'], index=Index([], dtype='object'))
 
         def f():
-            df = DataFrame()
+            df = DataFrame(index=Index([], dtype='object'))
             df['foo'] = Series([], dtype='object')
             return df
 
@@ -478,22 +478,21 @@ def f():
         expected['foo'] = expected['foo'].astype('float64')
 
         def f():
-            df = DataFrame()
+            df = DataFrame(index=Index([], dtype='int64'))
             df['foo'] = []
             return df
 
         tm.assert_frame_equal(f(), expected)
 
         def f():
-            df = DataFrame()
+            df = DataFrame(index=Index([], dtype='int64'))
             df['foo'] = Series(np.arange(len(df)), dtype='float64')
             return df
 
         tm.assert_frame_equal(f(), expected)
 
         def f():
-            df = DataFrame()
-            tm.assert_index_equal(df.index, Index([], dtype='object'))
+            df = DataFrame(index=Index([], dtype='int64'))
             df['foo'] = range(len(df))
             return df