Lesen und Initialisieren von Json-Daten mit Scalatest mit Fixture

Question

Ich versuche withFixture Methode zu verwenden, um meine var ip2GeoTestJson zu initialisieren und sie während meiner Tests zu verwenden. Ich konnte die gewünschte Logik mit var year erreichen. Ich glaube, der Fehler, den ich bekomme (Parsing JNothing) wird verursacht, weil die withFixture nicht initialisiert meine ip2GeoTestJson mit dem JSON.

Ich bin derzeit immer diese Fehlermeldung:

*** 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) 

Code:

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() 
    } 
    } 
} 

Der Code funktioniert gut, wenn die Linien in Bezug auf ip2GeoData an die Spitze der Klasse bewegt werden wie so aber ich muss hardcode der Dateiname:

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

Parameter vor jedem Test einstellen (se e 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() 
    } 
    } 
} 

Set params nur einmal vor jeder Prüfung (http://www.scalatest.org/user_guide/sharing_fixtures#beforeAndAfter) ausgeführt wird:

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) 
    } 
    } 
}