1 files changed, 56 insertions, 0 deletions
diff --git a/kamon-trace/src/test/scala/kamon/FutureTracingSpec.scala b/kamon-trace/src/test/scala/kamon/FutureTracingSpec.scala
new file mode 100644
index 00000000..7ff1b96d
--- /dev/null
+++ b/kamon-trace/src/test/scala/kamon/FutureTracingSpec.scala
@@ -0,0 +1,56 @@
+package kamon
+
+import scala.concurrent.{ExecutionContext, Await, Promise, Future}
+import org.scalatest.{Matchers, OptionValues, WordSpec}
+import org.scalatest.concurrent.{ScalaFutures, PatienceConfiguration}
+import java.util.UUID
+import scala.util.{Random, Success}
+import scala.concurrent.duration._
+import java.util.concurrent.TimeUnit
+import akka.actor.{Actor, ActorSystem}
+import kamon.trace.{Trace, TraceContext}
+
+
+class FutureTracingSpec extends WordSpec with Matchers with ScalaFutures with PatienceConfiguration with OptionValues {
+
+  implicit val execContext = ExecutionContext.Implicits.global
+
+  "a Future created with FutureTracing" should {
+    "capture the TraceContext available when created" which {
+      "must be available when executing the future's body" in new TraceContextFixture {
+        var future: Future[Option[TraceContext]] = _
+
+        Trace.withValue(testTraceContext) {
+          future = Future(Trace.context)
+        }
+
+        whenReady(future)( ctxInFuture =>
+          ctxInFuture should equal(testTraceContext)
+        )
+      }
+
+      "must be available when executing callbacks on the future" in new TraceContextFixture {
+        var future: Future[Option[TraceContext]] = _
+
+        Trace.withValue(testTraceContext) {
+          future = Future("Hello Kamon!")
+            // The TraceContext is expected to be available during all intermediate processing.
+            .map (_.length)
+            .flatMap(len => Future(len.toString))
+            .map (s => Trace.context())
+        }
+
+        whenReady(future)( ctxInFuture =>
+          ctxInFuture should equal(testTraceContext)
+        )
+      }
+    }
+  }
+
+  trait TraceContextFixture {
+    val random = new Random(System.nanoTime)
+    val testTraceContext = Some(TraceContext(Actor.noSender, random.nextInt))
+  }
+}
+
+