semantic.fake_invalid: Test's fakes script something no provider operation answers

Test's fakes script something no provider operation answers.

Area 13, Testing; not declinable; the next step is usually the agent's.

A test's fakes: scripts something no provider operation answers: an operation the app's connections don't have, a name that is none of the operation's failures' codes or a condition, an operation scripted twice or with no answers, or a value for one that gives nothing. A value of the wrong type is the usual type.mismatch.

example

use app { couriers }use shipping/failures { SlotGone }test "a taken slot is the app's own failure" {    fakes: {        couriers.bookings.create: [slot_takn]    }    assert book("N1 9GU") fails SlotGone}

jadpo checkcheck failed: 1 error, 13 files

error slot_takn isn't an answer couriers.bookings.create gives

--> domains/shipping/actions/book.test.jadpo:6:36

  |6 |         couriers.bookings.create: [slot_takn]  |                                    ^^^^^^^^^ not a failure or a condition

reason: A scripted answer is a value of AcmeCouriers.Booking, one of couriers.bookings.create's failures by its code (slot_taken), or a condition: unavailable, lost, in_use or misconfigured.
next: Use slot_taken instead of slot_takn (agent)
rule: semantic.fake_invalid
help: https://jadpo.dev/docs/errors/semantic.fake_invalid