[Moose-dev] PPCompositeTest

Hi Lukas,

I noticed that you override two times the changes I pushed in the PPCompositeTest, and as expected, these changes break most of the external tests :).

In particular, there are two things that I found useful: - the result instance variable holding the side effect of executing #parse:rule:. This is useful for reusing the grammar tests in the parser tests. - the fail:rule: method for negative tests.

In the last comment, you mentioned that this was due to incompatibilities with Helvetia. Should we create a new class with these utilities?

Cheers, Doru

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