sameInstance

server/src/test/java/org/elasticsearch/index/shard/IndexShardTests.java

@@ -5202,9 +5202,11 @@ public void prepareForEngineReset() throws IOException {
             });
         });
         holdEngineThread.start();
-        safeGet(hold);
+        var retainedInstance = safeGet(hold);
 
-        assertThat(shard.getEngine(), instanceOf(InternalEngine.class));
+        var currentInstance = shard.getEngine();
+        assertThat(currentInstance, instanceOf(InternalEngine.class));
+        assertThat(currentInstance, sameInstance(retainedInstance));
 
         final var reset = new PlainActionFuture<Void>();
         final var resetEngineThread = new Thread(() -> {