[Imps] Patch to convert test_parser to unittest

[James Graham]

Sam Ruby wrote:
> James Graham wrote:
>> Sam Ruby wrote:
>>> The default message produced by UnitTest.assertEqual includes 
>>> representations for both the expected and actual parse trees.  If the 
>>> formatting is an issue, a third parameter can be passed to 
>>> assertEqual that contains the exact message you would like to be 
>>> produced in case of failure.
>>
>> Ah, I had missed that somehow. OK, changes checked in with additional 
>> error messages. Thanks!
> 
> What about runtests.py?

Added.


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