[onli]

Seriously. How is someone that does not even know the correct name of the software supposed to know enough about said software to know whether it is similar enough to be a good test replacement?

I know this is a bit too much against the person, but here that is directly relevant to the topic at hand.

Not that he is totally wrong, but he is wrong in the universality of his argument. It depends on what postgres-specific features the software is using and how the communication with the database is handled. If it is handwritten SQL, it is not a good idea regardless. If it is a ORM that maps the two very well and there is noting postgres-specific about the software, it is unlikely to be a problem.