[issue32874] IDLE: Add tests for pyparse

[Cheryl Sabella]

Cheryl Sabella <chekat2 at gmail.com> added the comment:

I also moved existing comments in pyparse.py to be docstrings.

Adding the tests revealed a bug in the initialization of self.lastopenbracketpos, but I didn't make any changes to fix it.  With the bug, the tests weren't repeatable, so I modified the tests to work with the bug in place.

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