# X_TEST_ADAPTER_PORT_UNSWAPPABLE

## Means

swapAdapter() was named a port it cannot swap for one test

## Typical cause

the port has no process-global slot a test could borrow and hand back, or the name is no ADAPTER_PORTS row — the cause says what a test does instead

## Fix

`await swapAdapter("jobs", memoryJobDriver()) — name a port SwappablePort lists, or do what the cause says for this one`

[Testing](/error-codes#testing)