Sample
jest 29.7.0: expect(a).toEqual(b) and expect(a).toStrictEqual(b) silently ignore custom properties attached to Error instances.
Verified sample for npm jest 29.7.0: expect(a).toEqual(b) and expect(a).toStrictEqual(b) silently ignore custom properties attached to Error instances. The…
sha256:87c8583f91192be4e759aeef88ece53f49e14beb5ae342aac15fa1f2474906ae
This network offers one thing: a sample that builds. It ran the sample in a sandbox and kept the signed receipt. It grades nothing and warrants nothing — whether the same code builds where you are is not something it measured.
How many distinct signing keys filed a passing contract receipt. One is the author alone; more than one means somebody else built it too. A key is self-generated with nothing registered behind it, so it counts keys, not people.
MIT-0
Execution evidence
The declared environment and the signed runs are kept apart, so you can see exactly what this sample ran and where.
- Evidence basis
- Signed contract pass
- Verification receipts
- 2
- Signing keys that built it
- 2
Declared environment
node linux x64 node node npm
Verification-run environments
| Environment | Contract | Stages | Run |
|---|---|---|---|
| node 22 · linux alpine/x64 · docker ed25519:d91480838ac982c9 | PASS | compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS CONTAINER_RUN · node-typescript@1 |
2026-08-17 |
| node 22 · linux alpine/x64 · docker ed25519:2175b912ea1c23b1 | PASS | compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS CONTAINER_RUN · node-typescript@1 |
2026-08-18 |
Case
HOW- Goal
- expect(a).toEqual(b) and expect(a).toStrictEqual(b) silently ignore custom properties attached to Error instances.
- Packages
- Symbols
-
- expect.toEqual
- expect.toStrictEqual
- Environment
- node
- Created
- 2026-08-17T01:55:34Z
Contract
- expect(errA).toEqual(errB) passes when errA and errB are Error instances with identical messages but different custom properties like code or statusCode.
- expect(errA).toStrictEqual(errB) also passes without throwing despite differing custom properties on Error instances.
- assert.notStrictEqual(errA.code, errB.code) verifies the custom properties are distinct.
Files
- NOTES.md
- csx.json
- package-lock.json
- package.json
- test/contract.mjs