update tests to reflect re-wording

Author: minggli

pandas/tests/frame/test_replace.py

@@ -614,9 +614,9 @@ def test_replace_with_empty_list(self):
         result = df.replace([], np.nan)
         assert_frame_equal(result, expected)
         # GH 19266
-        with tm.assert_raises_regex(Exception, "cannot assign mismatch"):
+        with tm.assert_raises_regex(Exception, "Cannot assign array"):
             df.replace({np.nan: []})
-        with tm.assert_raises_regex(Exception, "cannot assign mismatch"):
+        with tm.assert_raises_regex(Exception, "Cannot assign array"):
             df.replace({np.nan: ['dummy', 'alt']})
 
     def test_replace_series_dict(self):

pandas/tests/series/test_replace.py

@@ -138,9 +138,9 @@ def test_replace_with_empty_list(self):
         tm.assert_series_equal(result, expected)
 
         # GH 19266
-        with tm.assert_raises_regex(Exception, "cannot assign mismatch"):
+        with tm.assert_raises_regex(Exception, "Cannot assign array"):
             s.replace({np.nan: []})
-        with tm.assert_raises_regex(Exception, "cannot assign mismatch"):
+        with tm.assert_raises_regex(Exception, "Cannot assign array"):
             s.replace({np.nan: ['dummy', 'alt']})
 
     def test_replace_mixed_types(self):