[issue15273] Remove unnecessarily random behavior from test_unparse.py

[Pablo Galindo Salgado]

Pablo Galindo Salgado <pablogsal at gmail.com> added the comment:

> @pablogsal should we add Lib/test/test_grammar by default to every test? Also if this is still needed @Daniel.Cioata do you still want to prepare another patch for current version?

I think is a good idea, let me check how complete is the current version first.

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<https://bugs.python.org/issue15273>
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