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I was testing exact matches on the strings because I think pypy wants to be as compliant as possible with cpython, and IMHO that include exception msgs as far as possible. I don't see any reason to be different just for the sake of it.
As a user I'd find strange not to get same exc msgs from different implementations, and it'll make me loose some time digging why those difference exist...
Back to the patch:
The multiline (and also differing offsets) are there for testing .lineno & .col_offset AST node's attributes. (there was a bug in pypy's implementation of those back then...)
Do you want that explained in the comment ?
Do you want me to add "self.assertIn("foobar", str(e))" in the tests, remove the comments or let them as in the patch #2 ?