Refactor: Improve a no-op test step to actually check the cache for the correct value being written
Refactor: Improve a no-op test step to actually check the cache for the correct value being written

Former-commit-id: 0b2ecbc4f1fe0d7d7ad25dcad5273fb9ef9d6372
dvla/vrm-retention-online,dvla/vehicles-presentation-common,dvla/vehicles-online,dvla/vehicles-online,dvla/vehicles-presentation-common,dvla/vehicles-online,dvla/vehicles-online,dvla/vrm-retention-online,dvla/vrm-retention-online,dvla/vrm-retention-online,dvla/vehicles-presentation-common