private void validateAllocatedContainers(boolean isReplicated, String containerTemplateLink)
        throws Throwable {
      QueryTask.Query kindClause =
          new QueryTask.Query()
              .setTermPropertyName(ServiceDocument.FIELD_NAME_KIND)
              .setTermMatchValue(Utils.buildKind(ContainerService.State.class));

      QueryTask.Query containerTemplateClause =
          new QueryTask.Query()
              .setTermPropertyName(
                  ContainerService.State.FIELD_NAME_CONTAINER_TEMPLATE_SERVICE_LINK)
              .setTermMatchValue(containerTemplateLink);

      QueryTask.QuerySpecification querySpecification = new QueryTask.QuerySpecification();
      querySpecification.query.addBooleanClause(kindClause);
      querySpecification.query.addBooleanClause(containerTemplateClause);

      QueryTask query = QueryTask.create(querySpecification).setDirect(true);

      NodeGroupBroadcastResponse queryResponse = testEnvironment.sendBroadcastQueryAndWait(query);
      Set<String> documentLinks = QueryTaskUtils.getBroadcastQueryResults(queryResponse);

      // Verify that count(replicas) == count(dockerVms) i.e. 1 container per vm
      int expectedReplicaCount = isReplicated ? dockerVms.size() : 1;
      assertThat(documentLinks.size(), is(expectedReplicaCount));

      // Verify that each container was assigned to a unique docker vm
      Set<String> uniqueVmLinks = new HashSet<>();
      for (String documentLink : documentLinks) {
        ContainerService.State state =
            testEnvironment.getServiceState(documentLink, ContainerService.State.class);
        uniqueVmLinks.add(state.vmServiceLink);
      }
      assertThat(uniqueVmLinks.size(), is(expectedReplicaCount));
    }
    @Test
    public void testWaitForQuery() throws Throwable {
      ExampleService exampleService = new ExampleService();
      final ExampleService.ExampleServiceState exampleServiceState =
          new ExampleService.ExampleServiceState();
      exampleServiceState.name = UUID.randomUUID().toString();

      QueryTask.Query kindClause =
          new QueryTask.Query()
              .setTermPropertyName(ServiceDocument.FIELD_NAME_KIND)
              .setTermMatchValue(Utils.buildKind(ExampleService.ExampleServiceState.class));

      QueryTask.Query nameClause =
          new QueryTask.Query()
              .setTermPropertyName("name")
              .setTermMatchValue(exampleServiceState.name);

      QueryTask.QuerySpecification spec = new QueryTask.QuerySpecification();
      spec.query.addBooleanClause(kindClause);
      spec.query.addBooleanClause(nameClause);
      spec.options = EnumSet.of(QueryTask.QuerySpecification.QueryOption.EXPAND_CONTENT);

      QueryTask query = QueryTask.create(spec).setDirect(true);

      try {
        host.waitForQuery(
            query,
            new Predicate<QueryTask>() {
              @Override
              public boolean test(QueryTask queryTask) {
                return queryTask.results.documentLinks.size() > 0;
              }
            });

        Assert.fail("waitForQuery should not have succeeded before documents are created");
      } catch (RuntimeException runtimeException) {
        assertThat(
            runtimeException.getMessage(),
            is(equalToIgnoringCase("timeout waiting for query result.")));
      }

      Operation post = host.startServiceSynchronously(exampleService, exampleServiceState);
      assertThat(post.getStatusCode(), is(200));

      ExampleService.ExampleServiceState result =
          host.getServiceState(ExampleService.ExampleServiceState.class);
      assertThat(result.name, is(exampleServiceState.name));

      QueryTask response =
          host.waitForQuery(
              query,
              new Predicate<QueryTask>() {
                @Override
                public boolean test(QueryTask queryTask) {
                  return queryTask.results.documentLinks.size() > 0;
                }
              });
      assertThat(response.results.documentLinks.size(), is(1));

      // verify fields are passed down correctly
      for (Map.Entry<String, Object> document : response.results.documents.entrySet()) {
        ExampleService.ExampleServiceState docState =
            Utils.fromJson(document.getValue(), ExampleService.ExampleServiceState.class);
        assertThat(docState.name, is(equalTo(exampleServiceState.name)));
      }
    }