test: add coverage for orphaned channel branch

Author: themechbro

core/src/test/java/io/grpc/internal/ManagedChannelOrphanWrapperTest.java

@@ -140,6 +140,30 @@ public boolean isLoggable(LogRecord record) {
     }
   }
 
+  @Test
+  public void orphanedChannel_triggerWarningAndCoverage() {
+    ManagedChannel mc = new TestManagedChannel();
+    final ReferenceQueue<ManagedChannelOrphanWrapper> refqueue = new ReferenceQueue<>();
+    ConcurrentMap<ManagedChannelReference, ManagedChannelReference> refs = 
+        new ConcurrentHashMap<>();
+    
+    // Create the wrapper but NEVER call shutdown
+    ManagedChannelOrphanWrapper wrapper = new ManagedChannelOrphanWrapper(mc, refqueue, refs);
+    wrapper = null; // Make it eligible for GC
+
+    // Trigger GC and clean the queue to hit the !wasShutdown branch
+    final AtomicInteger numOrphans = new AtomicInteger();
+    GcFinalization.awaitDone(new FinalizationPredicate() {
+      @Override
+      public boolean isDone() {
+        numOrphans.getAndAdd(ManagedChannelReference.cleanQueue(refqueue));
+        return numOrphans.get() > 0;
+      }
+    });
+    
+    assertEquals(1, numOrphans.get());
+  }
+
   @Test
   public void refCycleIsGCed() {
     ReferenceQueue<ManagedChannelOrphanWrapper> refqueue =