rishisankar commented on a change in pull request #1688:
URL: https://github.com/apache/lucene-solr/pull/1688#discussion_r463357149



##########
File path: 
solr/solrj/src/test/org/apache/solr/client/solrj/impl/CloudHttp2SolrClientTest.java
##########
@@ -1074,4 +1077,37 @@ private void 
queryWithPreferReplicaTypes(CloudHttp2SolrClient cloudClient,
     }
   }
 
+  /**
+   * Tests the async request code pathway to ensure that normal requests will 
trigger the onSuccess callback.
+   */
+  @Test
+  public void asyncRequestTest() throws Exception {
+    final String collectionName = "asyncRequestCollection";
+
+    // Create collection
+    CollectionAdminRequest.createCollection(collectionName, "conf", 2, 
1).process(cluster.getSolrClient());
+    cluster.waitForActiveCollection(collectionName, 2, 2);
+
+    AsyncListener<LBHttp2SolrClient.Rsp> callback = new AsyncListener<>() {
+      @Override
+      public void onSuccess(LBHttp2SolrClient.Rsp rsp) { asyncCallbackRun = 
true; }
+
+      @Override
+      public void onFailure(Throwable throwable) { }
+    };
+
+    QueryRequest request = new QueryRequest(); // params of the request aren't 
important for this test
+
+    // Test success callback runs on a "successful" request
+    asyncCallbackRun = false;
+    getRandomClient().asyncRequest(request, collectionName, callback);
+
+    // Wait for up to 500ms timeout success callback to run
+    int count = 0;
+    while (!asyncCallbackRun && ++count <= 20) {
+      Thread.sleep(25);

Review comment:
       Updated to use a Semaphore instead.




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