與scalatest withFixture

Question

閱讀和初始化JSON數據，我試圖用withFixture方法來初始化我var ip2GeoTestJson，並用它在我的測試。我能夠通過var year實現所需的邏輯。我相信我得到（解析JNothing）錯誤是因爲withFixture未初始化我ip2GeoTestJson與JSON引起的。

我目前正在此錯誤：

*** 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) 

代碼：

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() 
    } 
    } 
} 

當關於ip2GeoData線移動到像這樣的類的頂部，但是我需要的代碼工作正常硬編碼文件名：

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

在每次測試之前設置參數（se Ëhttp://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() 
    } 
    } 
} 

設置PARAMS只有一次前的任何測試將運行（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) 
    } 
    } 
}