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diff --git a/kamon-core/src/test/scala/kamon/MailboxSizeMetricsSpec.scala b/kamon-core/src/test/scala/kamon/MailboxSizeMetricsSpec.scala
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+++ b/kamon-core/src/test/scala/kamon/MailboxSizeMetricsSpec.scala
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+/* ===================================================
+ * Copyright © 2013 the kamon project <http://kamon.io/>
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * ========================================================== */
+package kamon
+
+import org.scalatest.{ WordSpecLike, WordSpec }
+import akka.testkit.TestKit
+import akka.actor.{ Props, ActorSystem }
+
+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")
+    }
+  }
+}