[issue11302] Add more tests to test_ast.py

[Benjamin Peterson]

Benjamin Peterson <benjamin at python.org> added the comment:

You still haven't explained why including multiline literals is a good idea.

Also, the reason we avoid matching exact messages is it can vary across implementations. You can still do an accurate test with something like self.assertIn("foobar", str(e))

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<http://bugs.python.org/issue11302>
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