While this is potentially very dangerous because assigning the ID does
not increase the ID sequence, it's safe to do so in tests where we
assign the ID to every record created on a certain table.
Even so, I'd consider it a bad practice which must be used with care. In
this case I'm using it because we look for IDs in the response, and
most tests in this file use literals to compare the response.
This changes makes it possible to remove unused variables while keeping
the test readable.
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