Question

我正在尝试使用withFixture方法初始化我的var ip2GeoTestJson并在整个测试过程中使用它。我能够用var year实现所需的逻辑。我相信我得到的错误（解析JNothing）是因为withFixture没有使用JSON初始化我的ip2GeoTestJson。

我目前收到此错误：

*** RUN ABORTED ***
  An exception or error caused a run to abort: java.lang.ClassCastException was thrown scenario("event.client_ip_address and event_header.client_ip_address both have values") -, construction cannot continue: "org.json4s.JsonAST$JNothing$ cannot be cast to org.json4s.JsonAST$JObject" (IP2GeoTestSuite.scala:51)

代码：

class IP2GeoTestSuite extends FeatureSpec with SparkContextFixture {
  var ip2GeoTestJson: JValue = null
  var year: String = null      

  feature("feature") {
    scenario("scenario") {
      println(ip2GeoTestJson)
      assert(year != null)
      assert(ip2GeoTestJson != null)
    }
  }

  def withFixture(test: NoArgTest): org.scalatest.Outcome = {
    year = test.configMap("year").asInstanceOf[String]
    val ip2GeoConfigFile = test.configMap("config").asInstanceOf[String]
    val ip2GeoUrl = getClass.getResourceAsStream(s"/$ip2GeoConfigFile")
    val ip2GeoJsonString = Source.fromInputStream(ip2GeoUrl).getLines.mkString("")
    System.out.println(ip2GeoJsonString)
    ip2GeoTestJson = parse(ip2GeoJsonString)
    try {
      test()
    }
  }
}

当关于ip2GeoData的行被移动到类的顶部时，代码工作正常，但是我需要对文件名进行硬编码：

class IP2GeoTestSuite extends FeatureSpec with SparkContextFixture {
    val ip2GeoConfigFile = "ip2geofile.json"
    val ip2GeoUrl = getClass.getResourceAsStream(s"/$ip2GeoConfigFile")
    val ip2GeoJsonString = Source.fromInputStream(ip2GeoUrl).getLines.mkString("")
    System.out.println(ip2GeoJsonString)
    val ip2GeoTestJson = parse(ip2GeoJsonString)
  var year: String = null      

  feature("feature") {
    scenario("scenario") {
      println(ip2GeoTestJson)
      assert(year != null)
      assert(ip2GeoTestJson != null)
    }
  }

  def withFixture(test: NoArgTest): org.scalatest.Outcome = {
    year = test.configMap("year").asInstanceOf[String]
    try {
      test()
    }
  }
}

Answer 1

在每次测试前设置参数（参见http://www.scalatest.org/user_guide/sharing_fixtures#withFixtureOneArgTest）：

case class FixtureParams(year: String, ip2GeoTestJson: JValue)

class IP2GeoTestSuite extends FeatureSpec with SparkContextFixture {      

  feature("feature") {
    scenario("scenario") {
      println(ip2GeoTestJson)
      assert(year != null)
      assert(ip2GeoTestJson != null)
    }
  }

  override def withFixture(test: OneArgTest): org.scalatest.Outcome = {
    val year = test.configMap("year").asInstanceOf[String]
    val ip2GeoConfigFile = test.configMap("config").asInstanceOf[String]
    val ip2GeoUrl = getClass.getResourceAsStream(s"/$ip2GeoConfigFile")
    val ip2GeoJsonString = Source.fromInputStream(ip2GeoUrl).getLines.mkString("")
    val fixtureParam = FixtureParam(year, parseJson(ip2GeoJsonString))
    try {
    withFixture(test.toNoArgTest(fixtureParam))
    } finally {
    // Close resourses to avoid memory leak and unpredictable behaviour
      ip2GeoUrl.close()
    }
  }
}

在任何测试运行之前只设置一次参数（http://www.scalatest.org/user_guide/sharing_fixtures#beforeAndAfter）：

class IP2GeoTestSuite extends FeatureSpec with BeforeAndAfter {

  var ip2GeoTestJson: JValue = null
  var year: String = null

  before {
    // Load config manually because configMap isn't available here. 
    val config = ConfigFactory.load()
    year = config.getString("year")
    val ip2GeoConfigFile = "ip2geofile.json"
    val ip2GeoUrl = getClass.getResourceAsStream(s"/$ip2GeoConfigFile")
    val ip2GeoJsonString = Source.fromInputStream(ip2GeoUrl).getLines.mkString("")
    ip2GeoUrl.close()
    System.out.println(ip2GeoJsonString)
    ip2GeoTestJson = parseJson(ip2GeoJsonString)
  }

  feature("feature") {
    scenario("scenario") {
      println(ip2GeoTestJson)
      assert(year != null)
      assert(ip2GeoTestJson != null)
    }
  }
}

使用scalatest withFixture读取和初始化json数据

1 个答案: