stub test for harmless=true

Update OutboundIdleShutdownSpec.scala

Update OutboundIdleShutdownSpec.scala

Author: pjfanning

remote/src/test/scala/org/apache/pekko/remote/artery/OutboundIdleShutdownSpec.scala

@@ -116,6 +116,8 @@ class OutboundIdleShutdownSpec extends ArteryMultiNodeSpec(s"""
       val remoteUid = futureUniqueRemoteAddress(association).futureValue.uid
 
       localArtery.quarantine(remoteAddress, Some(remoteUid), "Test")
+      association.associationState.isQuarantined(remoteUid) shouldBe true
+      association.associationState.isHarmlessQuarantined(remoteUid) shouldBe false
 
       eventually {
         assertStreamActive(association, Association.ControlQueueIndex, expected = false)
@@ -128,6 +130,26 @@ class OutboundIdleShutdownSpec extends ArteryMultiNodeSpec(s"""
       }
     }
 
+    "eliminate quarantined association when not used (harmless=true)" in withAssociation {
+      (_, remoteAddress, _, localArtery, _) =>
+        val association = localArtery.association(remoteAddress)
+        val remoteUid = futureUniqueRemoteAddress(association).futureValue.uid
+
+        localArtery.quarantine(remoteAddress, Some(remoteUid), "HarmlessTest", harmless = true)
+        association.associationState.isQuarantined(remoteUid) shouldBe true
+        association.associationState.isHarmlessQuarantined(remoteUid) shouldBe true
+
+        eventually {
+          assertStreamActive(association, Association.ControlQueueIndex, expected = false)
+          assertStreamActive(association, Association.OrdinaryQueueIndex, expected = false)
+        }
+
+        // the outbound streams are inactive and association quarantined, then it's completely removed
+        eventually {
+          localArtery.remoteAddresses should not contain remoteAddress
+        }
+    }
+
     "remove inbound compression after quarantine" in withAssociation { (_, remoteAddress, _, localArtery, _) =>
       val association = localArtery.association(remoteAddress)
       val remoteUid = futureUniqueRemoteAddress(association).futureValue.uid