hard20 pts · first answer countsapi-testingdistributed-systems

Asserting on eventual consistency

After POST /orders, a GET /orders/{id} sometimes returns 404 for a short time because data is copied to a read replica. What is the best way to assert?

await expect.poll(async () => {
  const r = await request.get('/orders/' + id)
  return r.status()
}, { timeout: 10_000 }).toBe(200)

A.Sleep 10 seconds before every GETB.Poll the condition with a timeout as shown, so the test waits only as long as needed and fails clearly if it never becomes trueC.Accept 404 as a valid resultD.Read directly from the primary database in the test

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Asserting on eventual consistency

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