# X_FLIGHT_RANDOM_UNINJECTED

## Means

a shipped source file calls `Math.random()`

## Typical cause

nothing downstream of it can be pinned by a test, which is why `packages/ai/src/gateway.ts` was the one retry engine of four with no test at all. A **call**, never a reference: `random = Math.random` as a default parameter is the injectable seam working correctly, and `packages/core/src/backoff.ts` does exactly that

## Fix

take a `random: () => number` parameter defaulting to `Math.random` and call that instead

[CLI and verify](/error-codes#cli-and-verify)