[issue19217] Calling assertEquals for moderately long list takes too long

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

Here is alternative patch. It outputs line diff even for large 
sequences/dicts/strings.

With the attached patch, unittest_scse.py works fine, producing this output:

FF
======================================================================
FAIL: test_compare (__main__.SCSE)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "unittest_scse.py", line 14, in test_compare
    self.assertEqual(arr1, arr2)
AssertionError: Lists differ: [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,[29953 
chars]1, 1] != [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,[29953 chars]2, 2]

First differing element 0:
1
2

- [1,
-  1,
-  1,
-  1,
-  1,
-  1,
-  1,
-  1,
-  1,
-  1,
-  1,
-  1,
-  1,
-  1,
-  1,
-  1,
-  1,
-  1,
-  1,
-  1,
-  1,
-  1,
-  1,
-  1,
-  1,
-  1,
-  1,
-  1,
-  1,
-  1,
-  1,
-  1,
+ [2,
+  2,
+  2,
+  2,
+  2,
+  2,
+  2,
+  2,
+  2,
+  2,
+  2,
+  2,
+  2,
+  2,
+  2,
+  2,
+  2,
+  2,
+  2,
+  2,
+  2,
+  2,
+  2,
+  2,
+  2,
+  2,
+  2,
+  2,
+  2,
+  2,
+  2,
+  2,
...
*** Diff is truncated.  Set self.maxDiffItems to None to see it all.

======================================================================
FAIL: test_compare_2 (__main__.SCSE)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "unittest_scse.py", line 24, in test_compare_2
    self.assertEqual(arr1, arr2)
AssertionError: Lists differ: [1, 1[29932 chars] 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] != [1, 1[29932 chars] 1, 1, 1, 1, 1, 1, 1, 1, 
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2]

First differing element 9999:
1
2

-  1]
+  2]

----------------------------------------------------------------------
Ran 2 tests in 1.813s

FAILED (failures=2)

----------
stage: commit review -> patch review
versions: +Python 3.5 -Python 3.3
Added file: http://bugs.python.org/file36330/issue19217-alt.diff

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<http://bugs.python.org/issue19217>
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