Scala 测试问题 [英] Scala test issues

问题描述

我是 Scala 的新手，使用 Scala 测试和喷雾 json 编写测试用例.我的代码如下:

I am new to Scala and writing test cases using Scala test and spray json. My code is as follows:

case class MyModel(Point1: String,
                          Point2: String,
                          Point3: Option[NewModel] = None)


case class NewModel(Point4: Boolean,
                          Point5: Boolean,
                          Point6: Boolean)

it should "serialise/deserialize a MyModel to JSON" in {
    val json= """{"Point1":"","Point3":[],"Point2":""}""".parseJson
    val myModelViaJson= json.convertTo[MyModel]

    myModelViaJson.Point1 shouldBe ""
    myModelViaJson.Point3.head.point4 shouldBe true
    myModelViaJson.Point2 shouldBe ""
}

我在运行测试用例时遇到以下错误

I am getting following error on running test case

should serialise/deserialize a MyModel to JSON *** FAILED ***
[info]   spray.json.DeserializationException: Object expected in field 'point4'
[info]   at spray.json.package$.deserializationError(package.scala:23)
[info]   at spray.json.ProductFormats.fromField(ProductFormats.scala:63)
[info]   at spray.json.ProductFormats.fromField$(ProductFormats.scala:51)

如何解决这个问题?

推荐答案

您的 JSON 将 Point3 的值设置为 []，这是一个空数组，但在Scala 它应该是一个 NewModel 对象(因此是Object expected").

Your JSON sets the value of Point3 to [] which is an empty array, but in the Scala it should be a NewModel object (hence "Object expected").

在 MyModel 中使用 Option 表示 JSON 中可能缺少该字段，在这种情况下，提取的值将为 None.如果 Point3 字段存在于 JSON 中，它应该包含 NewModel 的 JSON，然后该字段将是 Some().

The use of Option in MyModel says that the field might be missing from the JSON, in which case the extracted value will be None. If the Point3 field is present in the JSON, it should contain the JSON for a NewModel, and the field will then be Some(<NewModel instance>).

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