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df8b79a53f
We can't just "swap" those model properties, as that sets instance vars on the classes that get reverted to their "previous" value, which ends up leaving the instance vars set as `nil`. However, our logic for those model/class properties actually checks for `defined?` as a way to override them, and delegates up to `Devise` global config if they are not defined, so leaving instance vars back with `nil` values isn't enough, we need to actually remove them. This introduces a new test helper specifically for overriding those model configs so that we can do proper cleanup.