eolivelli commented on a change in pull request #9738:
URL: https://github.com/apache/pulsar/pull/9738#discussion_r583643179



##########
File path: 
pulsar-broker/src/test/java/org/apache/pulsar/broker/PulsarServiceTest.java
##########
@@ -0,0 +1,59 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+package org.apache.pulsar.broker;
+
+import static org.mockito.Mockito.mock;
+import java.util.Optional;
+import lombok.extern.slf4j.Slf4j;
+import org.apache.pulsar.functions.worker.WorkerConfig;
+import org.apache.pulsar.functions.worker.WorkerService;
+import org.testng.annotations.Test;
+
+
+@Slf4j
+public class PulsarServiceTest {
+
+    @Test
+    public void testGetWorkerService() {
+        ServiceConfiguration configuration = new ServiceConfiguration();
+        configuration.setZookeeperServers("localhost");
+        configuration.setClusterName("clusterName");
+        configuration.setFunctionsWorkerEnabled(true);
+        PulsarService pulsarService = new PulsarService(configuration, new 
WorkerConfig(),
+                Optional.of(mock(WorkerService.class)), (exitCode) -> {});
+
+        pulsarService.getWorkerService();

Review comment:
       please add assertSame, otherwise you are not testing that the method is 
doing what it is expected to do

##########
File path: 
pulsar-broker/src/test/java/org/apache/pulsar/broker/PulsarServiceTest.java
##########
@@ -0,0 +1,59 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+package org.apache.pulsar.broker;
+
+import static org.mockito.Mockito.mock;
+import java.util.Optional;
+import lombok.extern.slf4j.Slf4j;
+import org.apache.pulsar.functions.worker.WorkerConfig;
+import org.apache.pulsar.functions.worker.WorkerService;
+import org.testng.annotations.Test;
+
+
+@Slf4j
+public class PulsarServiceTest {
+
+    @Test
+    public void testGetWorkerService() {
+        ServiceConfiguration configuration = new ServiceConfiguration();
+        configuration.setZookeeperServers("localhost");
+        configuration.setClusterName("clusterName");
+        configuration.setFunctionsWorkerEnabled(true);
+        PulsarService pulsarService = new PulsarService(configuration, new 
WorkerConfig(),
+                Optional.of(mock(WorkerService.class)), (exitCode) -> {});
+
+        pulsarService.getWorkerService();
+    }
+
+    /**
+     * Verifies that the getWorkerService throws {@link 
UnsupportedOperationException}
+     * when functionsWorkerEnabled is set to false .
+     */
+    @Test(expectedExceptions = UnsupportedOperationException.class)
+    public void testGetWorkerServiceException() throws Exception {
+        ServiceConfiguration configuration = new ServiceConfiguration();
+        configuration.setZookeeperServers("localhost");
+        configuration.setClusterName("clusterName");
+        configuration.setFunctionsWorkerEnabled(false);
+        PulsarService pulsarService = new PulsarService(configuration, new 
WorkerConfig(),
+                Optional.empty(), (exitCode) -> {});
+
+        pulsarService.getWorkerService();

Review comment:
       can you also please test against the error message?
   the main point of this issue is that the user is getting a bad experience.
   
   If we ensure that the message is meaningful then we are sure that we are 
addressing the problem for the user

##########
File path: 
pulsar-broker/src/main/java/org/apache/pulsar/broker/PulsarService.java
##########
@@ -957,8 +957,9 @@ public NamespaceService getNamespaceService() {
         return functionWorkerService;
     }
 
-    public WorkerService getWorkerService() {
-        return functionWorkerService.orElse(null);
+    public WorkerService getWorkerService() throws 
UnsupportedOperationException {
+        return functionWorkerService.orElseThrow(() -> new 
UnsupportedOperationException("Pulsar Functions worker " +

Review comment:
       what about:
   "Pulsar Function Worker is not enabled, probably functionsWorkerEnabled is 
set to false" 




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