开玩笑的数据类型评估返回错误类型

Question

我正在使用jestjs库来测试我的nodejs应用程序。在测试返回数据类型时，某些测试未能说收到的数据类型是其他预期的东西，但是返回的数据类型是不正确的。例如，我有一个日期字符串作为对象接收，但实际上是一个字符串。

  Received has value: [Error: expect(received).toBe(expected) // Object.is equality·
    Expected: "string"
    Received: "object"]

      82 |     expect(typeof response.data.getPublicDisinfectionByProductStage2[0].details[0].nextSampleDateRange).toBe("string");

正在评估响应对象：

 {
        "systemId": 1289,
        "frequency": "QT",   
        "details": [
          {
            "sampleId": 19842,
            "nextSampleDateRange": "04/01/2022 - 06/30/2022"
          }
]
}

然后使用类似的对象，测试失败而错误：

    expect(received).toMatch(expected)

    Matcher error: received value must be a string

    Received has type:  object
    Received has value: [Error: expect(received).toBe(expected) // Object.is equality·
    Expected: "number"
    Received: "object"]

      107 |     expect(typeof response.data.getPublicOtherDistributionMonitoringPbcu.nextSampleDateRange).toBe("string");
      108 |   } catch (e) {
    > 109 |     expect(e).toMatch("error");
          |               ^
      110 |   }
      111 | });

在哪里评估对象如下：

{
  "data": {
    "getPublicOtherDistributionMonitoringPbcu": {
      "systemId": 1289,
      "lastSampleDate": "2018-09-27 00:00:00",
      "nextSampleDateRange": "06/01/2022 - 09/30/2022"
    }
  }
}

有人可以帮助我了解这里发生了什么吗？