title: Akka Cluster Sharding - How to test
body: <p>I want to test a function that at some point asks an EventSourcedBehaviorWithEnforcedReplies  using ClusterSharing</p>
  
  <p>I prepare the ClusterSharding like:</p>
  
  <pre><code>  ClusterSharding.get(testKit.system()).init(
      Entity.of(
          ENTITY_TYPE_KEY,
          entityContext -&gt; new Entity(entityContext.getEntityId())));
  </code></pre>
  
  <p>The function sends a command :</p>
  
  <pre><code>CompletionStage&lt;ActorAnswer&gt; promisedAnswer = sharding
      .entityRefFor(ENTITY_TYPE_KEY, identifier)
      .ask(CommandToExecute::new, ASK_TIMEOUT)
  </code></pre>
  
  <p>The CompletionStage never gets executed...  </p>
  
  <p>What am I missing?</p>