Reading and initializing json data with scalatest withFixture - json

Question

I am trying to use withFixture method to initialize my var ip2GeoTestJson and use it throughout my tests. I was able to achieve the desired logic with var year. I believe the error I am getting (parsing JNothing) is caused because the withFixture is not initializing my ip2GeoTestJson with the JSON.
I am currently getting this error:
*** 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()
}
}
}
The code works fine when the lines regarding ip2GeoData are moved to the top of the class like so however I need to hardcode the file name:
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

Set params before every test (see 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"/$ip2GeoConfigFile")
val ip2GeoJsonString = Source.fromInputStream(ip2GeoUrl).getLines.mkString("")
val fixtureParam = FixtureParam(year, parseJson(ip2GeoJsonString))
try {
withFixture(test.toNoArgTest(fixtureParam))
} finally {
// Close resourses to avoid memory leak and unpredictable behaviour
ip2GeoUrl.close()
}
}
}
Set params only once before any test will run (http://www.scalatest.org/user_guide/sharing_fixtures#beforeAndAfter):
class IP2GeoTestSuite extends FeatureSpec with BeforeAndAfter {
var ip2GeoTestJson: JValue = null
var year: String = null
before {
// Load config manually because configMap isn't available here.
val config = ConfigFactory.load()
year = config.getString("year")
val ip2GeoConfigFile = "ip2geofile.json"
val ip2GeoUrl = getClass.getResourceAsStream(s"/$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)
}
}
}