1 files changed, 6 insertions, 2 deletions
diff --git a/kamon-metrics/src/test/scala/kamon/MailboxSizeMetricsSpec.scala b/kamon-metrics/src/test/scala/kamon/MailboxSizeMetricsSpec.scala
index 7cae30f1..206c58e1 100644
--- a/kamon-metrics/src/test/scala/kamon/MailboxSizeMetricsSpec.scala
+++ b/kamon-metrics/src/test/scala/kamon/MailboxSizeMetricsSpec.scala
@@ -1,12 +1,16 @@
 package kamon
 
-import org.scalatest.WordSpec
+import org.scalatest.{WordSpecLike, WordSpec}
+import akka.testkit.TestKit
+import akka.actor.{Props, ActorSystem}
 
-class MailboxSizeMetricsSpec extends WordSpec {
+class MailboxSizeMetricsSpec extends TestKit(ActorSystem("mailbox-size-metrics-spec")) with WordSpecLike {
 
   "the mailbox size metrics instrumentation" should {
     "register a counter for mailbox size upon actor creation" in {
+      val target = system.actorOf(Props.empty, "sample")
 
+      Metrics.registry.getHistograms.get("akka://mailbox-size-metrics-spec/sample:MAILBOX")
     }
   }
 }