mimaison commented on code in PR #23150:
URL: https://github.com/apache/kafka/pull/23150#discussion_r3880635478


##########
connect/runtime/src/test/java/org/apache/kafka/connect/runtime/rest/ConnectRestServerTest.java:
##########
@@ -327,6 +329,80 @@ public void testIndependentAdminEndpoint() throws 
IOException {
         assertEquals(404, response.getStatusLine().getStatusCode());
     }
 
+    @Test
+    public void testRestExtensionsRegisteredWithAdminListener() throws 
IOException {
+        Map<String, String> configMap = new HashMap<>(baseServerProps());
+        configMap.put(RestServerConfig.ADMIN_LISTENERS_CONFIG, 
"http://localhost:0";);
+        configMap.put(RestServerConfig.REST_EXTENSION_CLASSES_CONFIG, 
HeaderConnectRestExtension.class.getName());
+
+        HeaderConnectRestExtension extension = new 
HeaderConnectRestExtension();
+        doReturn(KAFKA_CLUSTER_ID).when(herder).kafkaClusterId();
+        doReturn(plugins).when(herder).plugins();
+        doReturn(List.of(extension)).when(plugins).newPlugins(any(), any(), 
eq(ConnectRestExtension.class));
+        doReturn(List.of()).when(herder).connectors();
+
+        server = new ConnectRestServer(null, restClient, configMap);
+        server.initializeServer();
+        server.initializeResources(herder);
+
+        assertNotEquals(server.advertisedUrl(), server.adminUrl());
+        assertEquals(2, extension.registrations);
+
+        HttpResponse regularResponse = executeRequest(server.advertisedUrl(), 
new HttpGet("/connectors"));
+        assertEquals(200, regularResponse.getStatusLine().getStatusCode());
+        assertNotNull(regularResponse.getFirstHeader(extension.name));
+
+        HttpResponse adminResponse = executeRequest(server.adminUrl(), new 
HttpGet("/admin/loggers"));
+        assertEquals(200, adminResponse.getStatusLine().getStatusCode());
+        assertNotNull(adminResponse.getFirstHeader(extension.name));
+    }
+
+    @Test
+    public void testRestExtensionsWithoutAdminListener() throws IOException {
+        Map<String, String> configMap = new HashMap<>(baseServerProps());
+        configMap.put(RestServerConfig.REST_EXTENSION_CLASSES_CONFIG, 
HeaderConnectRestExtension.class.getName());
+
+        HeaderConnectRestExtension extension = new 
HeaderConnectRestExtension();
+        doReturn(KAFKA_CLUSTER_ID).when(herder).kafkaClusterId();
+        doReturn(plugins).when(herder).plugins();
+        doReturn(List.of(extension)).when(plugins).newPlugins(any(), any(), 
eq(ConnectRestExtension.class));
+        doReturn(List.of()).when(herder).connectors();
+
+        server = new ConnectRestServer(null, restClient, configMap);
+        server.initializeServer();
+        server.initializeResources(herder);
+
+        assertEquals(1, extension.registrations);
+
+        HttpResponse response = executeRequest(server.advertisedUrl(), new 
HttpGet("/connectors"));
+        assertEquals(200, response.getStatusLine().getStatusCode());
+        assertNotNull(response.getFirstHeader(extension.name));

Review Comment:
   Feel free to followup with a PR. Thanks



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