kpatelatwork commented on a change in pull request #10841:
URL: https://github.com/apache/kafka/pull/10841#discussion_r651267237



##########
File path: 
connect/runtime/src/test/java/org/apache/kafka/connect/runtime/WorkerConfigTest.java
##########
@@ -56,6 +57,39 @@
             "set X-Frame-Options:DENY, add  :no-cache, no-store, 
must-revalidate "
     );
 
+    @Test
+    public void testListenersConfigAllowedValues() {
+        Map<String, String> props = baseProps();
+
+        // no value set for "listeners"
+        WorkerConfig config = new WorkerConfig(WorkerConfig.baseConfigDef(), 
props);
+        assertEquals(LISTENERS_DEFAULT, 
config.getList(WorkerConfig.LISTENERS_CONFIG));
+
+        props.put(WorkerConfig.LISTENERS_CONFIG, "http://a.b:9999";);
+        config = new WorkerConfig(WorkerConfig.baseConfigDef(), props);
+        assertEquals(config.getList(WorkerConfig.LISTENERS_CONFIG), 
Arrays.asList("http://a.b:9999";));
+
+        props.put(WorkerConfig.LISTENERS_CONFIG, "http://a.b:9999, 
https://a.b:7812";);
+        config = new WorkerConfig(WorkerConfig.baseConfigDef(), props);
+        assertEquals(config.getList(WorkerConfig.LISTENERS_CONFIG), 
Arrays.asList("http://a.b:9999";, "https://a.b:7812";));
+
+        new WorkerConfig(WorkerConfig.baseConfigDef(), props);
+    }
+
+    @Test
+    public void testListenersConfigNotAllowedValues() {
+        Map<String, String> props = baseProps();
+
+        props.put(WorkerConfig.LISTENERS_CONFIG, "");
+        assertThrows(ConfigException.class, () -> new 
WorkerConfig(WorkerConfig.baseConfigDef(), props)).printStackTrace();

Review comment:
       Very good suggestion, I added that case.




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