Using snapshots for testing

[mspirkov]

Q	A
Is bugfix?	❌
New feature?	❌
Breaks BC?	❌
Fixed issues

I think this is the best way to test it. The reasons for this:

1. The result size is too big to check it with inline snapshots. If we cover everything with inline snapshots, the tests will become very complex and unmaintainable.
2. With this snapshots, we can be sure that the result hasn't changed.
3. It is easier to track changes in the result.