DL1231 commented on code in PR #15067:
URL: https://github.com/apache/kafka/pull/15067#discussion_r1667581915


##########
core/src/test/scala/unit/kafka/server/DynamicConfigChangeTest.scala:
##########
@@ -566,6 +574,45 @@ class DynamicConfigChangeTest extends 
KafkaServerTestHarness {
     }
   }
 
+  @ParameterizedTest
+  @ValueSource(strings = Array("kraft+kip848"))
+  def testDynamicGroupConfigChange(quorum: String): Unit = {
+    val newSessionTimeoutMs = 50000
+    val consumerGroupId = "group-foo"
+    val admin = createAdminClient()
+    try {
+      val resource = new ConfigResource(ConfigResource.Type.GROUP, 
consumerGroupId)
+      val op = new AlterConfigOp(new 
ConfigEntry(GroupConfig.CONSUMER_SESSION_TIMEOUT_MS_CONFIG, 
newSessionTimeoutMs.toString),
+        OpType.SET)
+      admin.incrementalAlterConfigs(Map(resource -> 
List(op).asJavaCollection).asJava).all.get
+    } finally {
+      admin.close()
+    }
+
+    TestUtils.retry(10000) {
+      brokers.head.groupCoordinator.groupMetadataTopicConfigs()
+      val configOpt = 
brokerServers.head.groupCoordinator.groupConfig(consumerGroupId)
+      assertTrue(configOpt.isPresent)
+    }
+
+    val groupConfig = 
brokerServers.head.groupCoordinator.groupConfig(consumerGroupId).get()
+    assertEquals(newSessionTimeoutMs, groupConfig.sessionTimeoutMs)
+  }
+
+  @ParameterizedTest
+  @ValueSource(strings = Array("kraft+kip848"))
+  def testIncrementalAlterDefaultGroupConfig(quorum: String): Unit = {

Review Comment:
   Consider aligning with `testIncrementalAlterDefaultTopicConfig`



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