# X_JOB_SIM_INVARIANT

## Means

a simulateJobs seed broke the invariant the test stated

## Typical cause

a race between workers, or a fault — kill, lost answer, lapsed lease, duplicate claim, clock jump — leaves the jobs in a state the app forbids

## Fix

`x test job --seed <n> --filter <the test file>` — replays that one seed and its faults

[Testing](/error-codes#testing)