dajac commented on code in PR #14635:
URL: https://github.com/apache/kafka/pull/14635#discussion_r1388489571


##########
clients/src/test/java/org/apache/kafka/common/requests/LeaveGroupResponseTest.java:
##########
@@ -165,4 +169,55 @@ public void testEqualityWithMemberResponses() {
             assertEquals(primaryResponse.hashCode(), 
reversedResponse.hashCode());
         }
     }
+
+    @ParameterizedTest
+    @ApiKeyVersionsSource(apiKey = ApiKeys.LEAVE_GROUP)
+    public void testNoErrorNoMembersResponses(short version) {
+        LeaveGroupResponseData data = new LeaveGroupResponseData()
+            .setErrorCode(Errors.NONE.code())
+            .setMembers(Collections.emptyList());
+
+        if (version < 3) {
+            assertThrows(UnsupportedVersionException.class,
+                    () -> new LeaveGroupResponse(data, version));
+        } else {
+            LeaveGroupResponse response = new LeaveGroupResponse(data, 
version);
+            assertEquals(Errors.NONE, response.topLevelError());

Review Comment:
   nit: Should we also assert the members here?



##########
clients/src/test/java/org/apache/kafka/common/requests/LeaveGroupResponseTest.java:
##########
@@ -165,4 +169,55 @@ public void testEqualityWithMemberResponses() {
             assertEquals(primaryResponse.hashCode(), 
reversedResponse.hashCode());
         }
     }
+
+    @ParameterizedTest
+    @ApiKeyVersionsSource(apiKey = ApiKeys.LEAVE_GROUP)
+    public void testNoErrorNoMembersResponses(short version) {
+        LeaveGroupResponseData data = new LeaveGroupResponseData()
+            .setErrorCode(Errors.NONE.code())
+            .setMembers(Collections.emptyList());
+
+        if (version < 3) {
+            assertThrows(UnsupportedVersionException.class,
+                    () -> new LeaveGroupResponse(data, version));
+        } else {
+            LeaveGroupResponse response = new LeaveGroupResponse(data, 
version);
+            assertEquals(Errors.NONE, response.topLevelError());
+        }
+    }
+
+    @ParameterizedTest
+    @ApiKeyVersionsSource(apiKey = ApiKeys.LEAVE_GROUP)
+    public void testNoErrorMultipleMembersResponses(short version) {
+        LeaveGroupResponseData data = new LeaveGroupResponseData()
+            .setErrorCode(Errors.NONE.code())
+            .setMembers(memberResponses);
+
+        if (version < 3) {
+            assertThrows(UnsupportedVersionException.class,
+                         () -> new LeaveGroupResponse(data, version));

Review Comment:
   nit: Could we also intend this one with 4 spaces?



##########
clients/src/test/java/org/apache/kafka/common/requests/LeaveGroupResponseTest.java:
##########
@@ -165,4 +169,55 @@ public void testEqualityWithMemberResponses() {
             assertEquals(primaryResponse.hashCode(), 
reversedResponse.hashCode());
         }
     }
+
+    @ParameterizedTest
+    @ApiKeyVersionsSource(apiKey = ApiKeys.LEAVE_GROUP)
+    public void testNoErrorNoMembersResponses(short version) {
+        LeaveGroupResponseData data = new LeaveGroupResponseData()
+            .setErrorCode(Errors.NONE.code())
+            .setMembers(Collections.emptyList());
+
+        if (version < 3) {
+            assertThrows(UnsupportedVersionException.class,
+                    () -> new LeaveGroupResponse(data, version));

Review Comment:
   nit: Could we indent this line with 4 spaces in order to remain consistent 
with the existing code?



##########
clients/src/test/java/org/apache/kafka/common/requests/LeaveGroupResponseTest.java:
##########
@@ -165,4 +169,55 @@ public void testEqualityWithMemberResponses() {
             assertEquals(primaryResponse.hashCode(), 
reversedResponse.hashCode());
         }
     }
+
+    @ParameterizedTest
+    @ApiKeyVersionsSource(apiKey = ApiKeys.LEAVE_GROUP)
+    public void testNoErrorNoMembersResponses(short version) {
+        LeaveGroupResponseData data = new LeaveGroupResponseData()
+            .setErrorCode(Errors.NONE.code())
+            .setMembers(Collections.emptyList());
+
+        if (version < 3) {
+            assertThrows(UnsupportedVersionException.class,
+                    () -> new LeaveGroupResponse(data, version));
+        } else {
+            LeaveGroupResponse response = new LeaveGroupResponse(data, 
version);
+            assertEquals(Errors.NONE, response.topLevelError());
+        }
+    }
+
+    @ParameterizedTest
+    @ApiKeyVersionsSource(apiKey = ApiKeys.LEAVE_GROUP)
+    public void testNoErrorMultipleMembersResponses(short version) {
+        LeaveGroupResponseData data = new LeaveGroupResponseData()
+            .setErrorCode(Errors.NONE.code())
+            .setMembers(memberResponses);
+
+        if (version < 3) {
+            assertThrows(UnsupportedVersionException.class,
+                         () -> new LeaveGroupResponse(data, version));
+        } else {
+            LeaveGroupResponse response = new LeaveGroupResponse(data, 
version);
+            assertEquals(Errors.NONE, response.topLevelError());

Review Comment:
   nit: Should we also assert members here?



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