chia7712 commented on code in PR #17671:
URL: https://github.com/apache/kafka/pull/17671#discussion_r1899527500


##########
test-common/test-common-api/src/test/java/org/apache/kafka/common/test/api/ClusterTestExtensionsTest.java:
##########
@@ -331,4 +342,105 @@ public void testControllerListenerName(ClusterInstance 
cluster) throws Execution
             assertEquals(1, 
admin.describeMetadataQuorum().quorumInfo().get().nodes().size());
         }
     }
+
+    @ClusterTest(
+        types = {Type.KRAFT, Type.CO_KRAFT},
+        brokerSecurityProtocol = SecurityProtocol.SASL_PLAINTEXT,
+        controllerSecurityProtocol = SecurityProtocol.SASL_PLAINTEXT,
+        serverProperties = {
+            @ClusterConfigProperty(key = 
GroupCoordinatorConfig.OFFSETS_TOPIC_PARTITIONS_CONFIG, value = "1"),
+            @ClusterConfigProperty(key = 
GroupCoordinatorConfig.OFFSETS_TOPIC_REPLICATION_FACTOR_CONFIG, value = "1")
+        }
+    )
+    public void testSaslPlaintext(ClusterInstance clusterInstance) throws 
InterruptedException {
+        Assertions.assertEquals(SecurityProtocol.SASL_PLAINTEXT, 
clusterInstance.config().brokerSecurityProtocol());
+
+        // default ClusterInstance#admin helper with admin credentials
+        try (Admin admin = clusterInstance.admin()) {
+            assertDoesNotThrow(() -> 
admin.describeAcls(AclBindingFilter.ANY).values().get());
+        }
+        String topic = "sasl-plaintext-topic";
+        Assertions.assertDoesNotThrow(() -> clusterInstance.createTopic(topic, 
1, (short) 1));

Review Comment:
   Since the APIs in question only throw runtime exceptions, there's no need to 
use `assertDoesNotThrow`, which is typically employed to convert checked 
exceptions into runtime exceptions.



##########
test-common/test-common-api/src/test/java/org/apache/kafka/common/test/api/ClusterTestExtensionsTest.java:
##########
@@ -331,4 +342,105 @@ public void testControllerListenerName(ClusterInstance 
cluster) throws Execution
             assertEquals(1, 
admin.describeMetadataQuorum().quorumInfo().get().nodes().size());
         }
     }
+
+    @ClusterTest(
+        types = {Type.KRAFT, Type.CO_KRAFT},
+        brokerSecurityProtocol = SecurityProtocol.SASL_PLAINTEXT,
+        controllerSecurityProtocol = SecurityProtocol.SASL_PLAINTEXT,
+        serverProperties = {
+            @ClusterConfigProperty(key = 
GroupCoordinatorConfig.OFFSETS_TOPIC_PARTITIONS_CONFIG, value = "1"),
+            @ClusterConfigProperty(key = 
GroupCoordinatorConfig.OFFSETS_TOPIC_REPLICATION_FACTOR_CONFIG, value = "1")
+        }
+    )
+    public void testSaslPlaintext(ClusterInstance clusterInstance) throws 
InterruptedException {
+        Assertions.assertEquals(SecurityProtocol.SASL_PLAINTEXT, 
clusterInstance.config().brokerSecurityProtocol());
+
+        // default ClusterInstance#admin helper with admin credentials
+        try (Admin admin = clusterInstance.admin()) {
+            assertDoesNotThrow(() -> 
admin.describeAcls(AclBindingFilter.ANY).values().get());
+        }
+        String topic = "sasl-plaintext-topic";
+        Assertions.assertDoesNotThrow(() -> clusterInstance.createTopic(topic, 
1, (short) 1));
+        try (Producer<byte[], byte[]> producer = clusterInstance.producer()) {
+            assertDoesNotThrow(() -> producer.send(new ProducerRecord<>(topic, 
Utils.utf8("key"), Utils.utf8("value"))).get());
+            assertDoesNotThrow(producer::flush);
+        }
+        try (Consumer<byte[], byte[]> consumer = clusterInstance.consumer()) {
+            consumer.subscribe(List.of(topic));
+            TestUtils.waitForCondition(() -> {
+                ConsumerRecords<byte[], byte[]> records = 
consumer.poll(Duration.ofMillis(100));
+                return records.count() == 1;
+            }, "Failed to receive message");
+        }
+
+        // client with non-admin credentials
+        Map<String, Object> nonAdminConfig = Map.of(

Review Comment:
   the helper methods of `clusterInstance` should be able configure the 
`sasl.jaas.config` automatically - that is why we add those helper to 
`clusterInstance`



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