New issue 637: Assertion reverse engineering often fails
https://bitbucket.org/hpk42/pytest/issue/637/assertion-reverse-engineering-often-fails
gcc111:
Consider the following simple program:
```
#!python
var = None
def test_foo():
assert 'Hello' == var, "whee"
```
I get the following output from py.test:
======================================================= test session
starts ========================================================
platform linux2 -- Python 2.7.3 -- py-1.4.22 -- pytest-2.6.0
plugins: django-assets, django
collected 0 items / 1 errors
============================================================== ERRORS
==============================================================
________________________________________ ERROR collecting
../../../../../../../tmp/test.py _________________________________________
/tmp/test.py:3: in <module>
assert 'Hello' == var, "whee"
E AssertionError: whee
===================================================== 1 error in 0.06
seconds ======================================================
Which is very pretty, but didn't actually tell me what went wrong, by giving me
the values of the left and right hand sides of the assertion.
I have to switch back to UnitTest.assertEqual, which does tell me (when I set
longMessage = True):
Traceback (most recent call last):
File "test.py", line 9, in test_foo
self.assertEqual('Hello', var, "whee")
AssertionError: 'Hello' != None : whee
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