[issue8414] Add test cases for assert

[Gregory Nofi]

Gregory Nofi <crackityjones2004-p at yahoo.com> added the comment:

I've uploaded new versions of the patch.

__debug__: I removed the "if __debug__" clause and switched to skipUnless.

Exception args: I replaced str(e) with e.args. Thanks for pointing that out! I had thought args was going to be deprecated but I guess it's not (Issue6777).

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Added file: http://bugs.python.org/file17035/test_grammar.v2.patch

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