rails_helper already has `ActiveRecord::Migration.maintain_test_schema!`
which automatically updates the test database if needed.
However, if we raise **before** `maintain_test_schema` had the chance
to do its job, the test database is never-automigrated.
Thus by removing the check, we ensure the test database will be migrated
as needed (and still an error will be raised if the schema cannot be
applied).
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