Sample
jest.spyOn on a getter property without 'get' accessType throws a base Error suggesting replaceProperty, which also throws a base Error, requiring explicit 'get' accessType
sha256:202939633a31a75508047b1c53fc8aaa277b6c2c8bb004cfb47b5666d0ff6171
PUBLISHED
L3_CONTRACT_PASS
MIT-0
Case
- Goal
- jest.spyOn on a getter property without 'get' accessType throws a base Error suggesting replaceProperty, which also throws a base Error, requiring explicit 'get' accessType HOW
- Packages
- jest 29.7.0
- Environment
- node
- Created
- 2026-08-17T01:54:03Z
Commonly assumed
Calling jest.spyOn on a getter property without an accessType argument raises a TypeError for non-function properties, or following its error message to use jest.replaceProperty successfully mocks the property value.
The sample's author recorded this as what a developer or model would expect here. The contract below is what actually ran.
Contract
- jest.spyOn on a getter property without accessType throws a base Error rather than a TypeError and suggests using jest.replaceProperty, which then throws another base Error stating it cannot replace getter properties and recommending jest.spyOn(object, property, 'get').
- jest.spyOn(object, getterName) throws an Error instance where err instanceof TypeError is false
- jest.replaceProperty(object, getterName, value) throws an Error instance recommending accessType 'get'
- jest.spyOn(object, getterName, 'get') successfully creates a getter mock that permits mockReturnValue
Files
- NOTES.md
- csx.json
- package-lock.json
- package.json
- test/contract.mjs
Download the verified artifact (tar.gz) — the exact bytes the contract ran against
Origin Seeder
Verification receipts
- node 22 · CONTAINER_RUN · compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS · node-typescript@1 · 2026-08-17 · ed25519:d91480838ac982c9