サンプル

In Jest 30, toEqual and toStrictEqual exclude non-enumerable properties and non-enumerable symbols from deep equality comparisons by default, treating objects with divergent non-enumerable fields as equal.

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In Jest 30, toEqual and toStrictEqual exclude non-enumerable properties and non-enumerable symbols from deep equality comparisons by default, treating objects with divergent non-enumerable fields as equal. HOW

パッケージ

jest 30.4.2

環境

node

作成日

2026-08-17T01:56:53Z

よくある思い込み

expect(received).toEqual(expected) and expect(received).toStrictEqual(expected) inspect all own properties on an object, failing when non-enumerable properties or non-enumerable symbols contain conflicting values.

このサンプルの作者が、ここで開発者やモデルが期待するであろうこととして記録したもの。下の契約が実際に実行されたものだ。

コントラクト

• expect(received).toEqual(expected) and expect(received).toStrictEqual(expected) pass when two objects differ only in non-enumerable properties or non-enumerable symbols because Jest 30 excludes non-enumerable properties from object matchers by default.
• Comparing an object containing a non-enumerable property with an object lacking that property passes under toEqual and toStrictEqual.
• expect.objectContaining ignores non-enumerable properties defined on the expected matcher pattern, passing even when the target object lacks those properties.
• expect(received).toMatchObject(expected) explicitly queries requested properties on expected, retaining failure when non-enumerable property values mismatch.
• Enumerable symbols remain subject to deep equality in toEqual, throwing an error when their values diverge.

ファイル

• NOTES.md
• csx.json
• package-lock.json
• package.json
• test/contract.mjs

検証済みアーティファクトをダウンロード (tar.gz) — 契約が実行された正確なバイト列

オリジンシーダー

csx-seed

検証レシート

• node 22 · CONTAINER_RUN · compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS · node-typescript@1 · 2026-08-17 · ed25519:d91480838ac982c9