RivenSun2 commented on a change in pull request #11800:
URL: https://github.com/apache/kafka/pull/11800#discussion_r814473563



##########
File path: 
clients/src/test/java/org/apache/kafka/clients/consumer/KafkaConsumerTest.java
##########
@@ -2866,6 +2866,25 @@ public void testUnknownConfigs() {
         }
     }
 
+    @Test
+    public void testUnusedAndUnknownConfigs() {
+        Map<String, Object> props = new HashMap<>();
+        props.put(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG, "localhost:9999");
+        props.put(SslConfigs.SSL_PROTOCOL_CONFIG, "TLS");
+        props.put(unknownTestConfig, "my_value");
+        ConsumerConfig config = new 
ConsumerConfig(ConsumerConfig.appendDeserializerToConfig(props, new 
StringDeserializer(), new StringDeserializer()));
+
+        assertTrue(config.unused().contains(SslConfigs.SSL_PROTOCOL_CONFIG));
+        assertTrue(config.unknown().contains(unknownTestConfig));
+        assertEquals(1, config.unknown().size());

Review comment:
       In fact, unused.size is not 1, I will add assert for it later.
   




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