chia7712 commented on code in PR #18767:
URL: https://github.com/apache/kafka/pull/18767#discussion_r1940637732


##########
clients/src/test/java/org/apache/kafka/clients/ClientUtilsTest.java:
##########
@@ -96,10 +100,32 @@ public void 
testParseAndValidateAddressesWithReverseLookup() {
         }
     }
 
-    @Test
-    public void testInvalidConfig() {
+    static Stream<List<String>> provideValidBrokerAddressTestCases() {
+        return Stream.of(
+            Arrays.asList("localhost:9997", "localhost:9998", 
"localhost:9999"),
+            // Intentionally provide a single string, as users may provide 
space-separated brokers, which will be parsed as a single string.
+            Arrays.asList("localhost:9997 localhost:9998 localhost:9999")
+        );
+    }
+
+    @ParameterizedTest
+    @MethodSource("provideValidBrokerAddressTestCases")
+    public void testValidBrokerAddress(List<String> addresses) {
+        assertDoesNotThrow(() -> 
ClientUtils.parseAndValidateAddresses(addresses, 
ClientDnsLookup.USE_ALL_DNS_IPS));
+    }
+
+    static Stream<List<String>> provideInvalidBrokerAddressTestCases() {
+        return Stream.of(
+            
Collections.singletonList("localhost:9997\nlocalhost:9998\nlocalhost:9999"),
+            Collections.singletonList("localhost:10000")

Review Comment:
   `localhost:10000` is valid, and the test can cause "expected" error due to 
"random.value"



##########
clients/src/test/java/org/apache/kafka/clients/ClientUtilsTest.java:
##########
@@ -96,10 +100,32 @@ public void 
testParseAndValidateAddressesWithReverseLookup() {
         }
     }
 
-    @Test
-    public void testInvalidConfig() {

Review Comment:
   Please keep `testInvalidConfig` as it is used to test 
`ClientDnsLookup.forConfig` ...



##########
clients/src/test/java/org/apache/kafka/clients/ClientUtilsTest.java:
##########
@@ -96,10 +100,32 @@ public void 
testParseAndValidateAddressesWithReverseLookup() {
         }
     }
 
-    @Test
-    public void testInvalidConfig() {
+    static Stream<List<String>> provideValidBrokerAddressTestCases() {
+        return Stream.of(
+            Arrays.asList("localhost:9997", "localhost:9998", 
"localhost:9999"),
+            // Intentionally provide a single string, as users may provide 
space-separated brokers, which will be parsed as a single string.
+            Arrays.asList("localhost:9997 localhost:9998 localhost:9999")

Review Comment:
   please add test case `Arrays.asList("localhost:9997", " localhost:9998", " 
localhost:9999")`



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