To clarify on my post just now:

My problem was that I did 

with scoped_session() as session:
    # setup stuff
    with pytest.raises(IntegrityError):
    session.commit()     # This should be inside the raises context.

So the syntax in the orignal post here is actually correct (I had to 
manually fix the indent for the code formatting).

SQLAlchemy - 
The Python SQL Toolkit and Object Relational Mapper

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