kamon-core/src/test/scala/kamon/trace/TraceLocalSpec.scala


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package kamon.trace

import akka.testkit.TestKit
import akka.actor.ActorSystem
import org.scalatest.{ OptionValues, Matchers, WordSpecLike }
import org.scalatest.concurrent.PatienceConfiguration

class TraceLocalSpec extends TestKit(ActorSystem("trace-local-spec")) with WordSpecLike with Matchers
    with PatienceConfiguration with OptionValues {

  object SampleTraceLocalKey extends TraceLocal.TraceLocalKey { type ValueType = String }

  "the TraceLocal storage" should {
    "allow storing and retrieving values" in {
      TraceRecorder.withNewTraceContext("store-and-retrieve-trace-local") {
        val testString = "Hello World"

        TraceLocal.store(SampleTraceLocalKey)(testString)
        TraceLocal.retrieve(SampleTraceLocalKey).value should equal(testString)
      }
    }

    "return None when retrieving a non existent key" in {
      TraceRecorder.withNewTraceContext("non-existent-key") {
        TraceLocal.retrieve(SampleTraceLocalKey) should equal(None)
      }
    }

    "return None when retrieving a key without a current TraceContext" in {
      TraceLocal.retrieve(SampleTraceLocalKey) should equal(None)
    }

    "be attached to the TraceContext when it is propagated" in {
      val testString = "Hello World"
      val testContext = TraceRecorder.withNewTraceContext("manually-propagated-trace-local") {
        TraceLocal.store(SampleTraceLocalKey)(testString)
        TraceLocal.retrieve(SampleTraceLocalKey).value should equal(testString)
        TraceRecorder.currentContext
      }

      /** No TraceLocal should be available here */
      TraceLocal.retrieve(SampleTraceLocalKey) should equal(None)

      TraceRecorder.withTraceContext(testContext) {
        TraceLocal.retrieve(SampleTraceLocalKey).value should equal(testString)
      }
    }
  }

}