Investigate testing

[Weakky]

We haven't investigated that at all yet

[jasonkuhrt]

https://github.com/ctrlplusb/prisma2-pg-jest by @ctrlplusb

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[jasonkuhrt]

What can we learn from https://github.com/prisma/prisma-test-utils?

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[jasonkuhrt]

Hm, narrowing the scope of this issue to be about just an example would make it a subset of #229 and #228 I think.