Jest中对象数组深度相等断言失败问题求助

我在使用Jest测试代码时，预期对象与接收对象看起来完全一致，但测试始终提示不匹配。

测试输出 #

Expected: ArrayContaining [{"buildingScores": ObjectContaining {"coast": Any<Number>, "fluvial": Any<Number>, "pluvial": Any<Number>}, "buildings": ArrayContaining [ObjectContaining {"id": Any<Number>, "score": Any<Number>, "scores": ObjectContaining {"coast": Any<Number>, "fluvial": Any<Number>, "pluvial": Any<Number>}}], "builidngScore": Any<Number>, "capakey": Any<String>, "createdAt": StringMatching /^\d{4}-\d{2}-\d{2}T\d{2}:\d{2}:\d{2}.\d{3}Z$/, "owners": ArrayContaining [Any<String>], "plotScore": Any<Number>, "plotScores": ObjectContaining {"coast": Any<Number>, "fluvial": Any<Number>, "pluvial": Any<Number>}, "updatedAt": StringMatching /^\d{4}-\d{2}-\d{2}T\d{2}:\d{2}:\d{2}.\d{3}Z$/, "zones": ObjectContaining {"bank": Any<Boolean>, "risk": Any<Boolean>, "signalArea": Any<Boolean>}}]
Received: [{"buildingScores": {"coast": 0, "fluvial": 0, "pluvial": 1}, "buildings": [{"id": 5723528, "score": 1, "scores": {"coast": 0, "fluvial": 0, "pluvial": 1}}, {"id": 6113163, "score": 0, "scores": {"coast": 0, "fluvial": 0, "pluvial": 0}}], "builidngScore": 1, "capakey": "44017A0860/00G002", "createdAt": 2022-12-28T12:58:12.319Z, "owners": "{\"WATERING OUDE KALE EN MEIREBEEK\"}", "plotScore": 2, "plotScores": {"coast": 0, "fluvial": 0, "pluvial": 2}, "updatedAt": 2022-12-28T12:58:12.319Z, "zones": {"bank": false, "risk": false, "signalArea": false}}]

断言语句 #

expect(scores).toEqual(expect.arrayContaining([expectedFloodScoreObject]))

预期对象定义 #

export const expectedFloodScoreObject = {
  createdAt: expect.stringMatching(DATE_REGEX),
  updatedAt: expect.stringMatching(DATE_REGEX),
  capakey: expect.any(String),
  owners: expect.arrayContaining([expect.any(String)]),
  zones: expect.objectContaining({
    risk: expect.any(Boolean),
    bank: expect.any(Boolean),
    signalArea: expect.any(Boolean)
  }),
  plotScore: expect.any(Number),
  plotScores: expect.objectContaining({
    pluvial: expect.any(Number),
    fluvial: expect.any(Number),
    coast: expect.any(Number)
  }),
  builidngScore: expect.any(Number),
  buildingScores: expect.objectContaining({
    pluvial: expect.any(Number),
    fluvial: expect.any(Number),
    coast: expect.any(Number)
  }),
  buildings: expect.arrayContaining([
    expect.objectContaining({
      id: expect.any(Number),
      score: expect.any(Number),
      scores: expect.objectContaining({
        pluvial: expect.any(Number),
        fluvial: expect.any(Number),
        coast: expect.any(Number)
      })
    })
  ])
}

日期正则 #

export const DATE_REGEX = /^\d{4}-\d{2}-\d{2}T\d{2}:\d{2}:\d{2}.\d{3}Z$/

问题原因 #

核心不匹配点在owners字段：

• 预期断言要求owners是字符串数组（expect.arrayContaining([expect.any(String)])）
• 实际接收值是JSON格式的字符串（"{\"WATERING OUDE KALE EN MEIREBEEK\"}"），属于单个字符串，不符合数组预期。

注：预期对象里的builidngScore拼写与接收值一致，因此不是问题。

解决方法 #

根据业务逻辑二选一：

1. 如果owners应该是数组：在业务代码中把该JSON字符串解析为数组，比如用JSON.parse(owners)处理后再返回。
2. 如果owners确实是JSON字符串：修改预期对象的owners断言，改为expect.any(String)，或者更精确的expect.stringMatching(/^\{.*\}$/)来匹配JSON结构的字符串。

内容的提问来源于stack exchange，提问作者Stephen