chia7712 commented on code in PR #17712:
URL: https://github.com/apache/kafka/pull/17712#discussion_r1835596925


##########
core/src/test/scala/integration/kafka/api/PlaintextAdminIntegrationTest.scala:
##########
@@ -2087,6 +2087,128 @@ class PlaintextAdminIntegrationTest extends 
BaseAdminIntegrationTest {
     }
   }
 
+  @ParameterizedTest
+  @ValueSource(strings = Array("kraft+kip932"))
+  def testListGroups(quorum: String): Unit = {
+    val classicGroupId = "classic_group_id"
+    val consumerGroupId = "consumer_group_id"
+    val shareGroupId = "share_group_id"
+    val testTopicName = "test_topic"
+
+    val classicGroupConfig = new Properties(consumerConfig)
+    classicGroupConfig.put(ConsumerConfig.GROUP_ID_CONFIG, classicGroupId)
+    classicGroupConfig.put(ConsumerConfig.GROUP_PROTOCOL_CONFIG, 
GroupProtocol.CLASSIC.name)
+    val classicGroup = createConsumer(configOverrides = classicGroupConfig)
+
+    val consumerGroupConfig = new Properties(consumerConfig)
+    consumerGroupConfig.put(ConsumerConfig.GROUP_ID_CONFIG, consumerGroupId)
+    consumerGroupConfig.put(ConsumerConfig.GROUP_PROTOCOL_CONFIG, 
GroupProtocol.CONSUMER.name)
+    val consumerGroup = createConsumer(configOverrides = consumerGroupConfig)
+
+    val shareGroupConfig = new Properties(consumerConfig)
+    shareGroupConfig.put(ConsumerConfig.GROUP_ID_CONFIG, shareGroupId)
+    val shareGroup = createShareConsumer(configOverrides = shareGroupConfig)
+
+    val config = createConfig
+    client = Admin.create(config)
+    try {
+      client.createTopics(Collections.singleton(
+        new NewTopic(testTopicName, 1, 1.toShort)
+      )).all().get()
+      waitForTopics(client, List(testTopicName), List())
+
+      classicGroup.subscribe(Collections.singleton(testTopicName))
+      classicGroup.poll(JDuration.ofMillis(1000))
+      consumerGroup.subscribe(Collections.singleton(testTopicName))
+      consumerGroup.poll(JDuration.ofMillis(1000))
+      shareGroup.subscribe(Collections.singleton(testTopicName))
+      shareGroup.poll(JDuration.ofMillis(1000))
+
+      TestUtils.waitUntilTrue(() => {
+        val groups = client.listGroups().all().get()
+        groups.size() == 3
+      }, "Expected to find all groups")
+
+      val classicGroupListing = new GroupListing(classicGroupId, 
Optional.of(GroupType.CLASSIC), "consumer")
+      val consumerGroupListing = new GroupListing(consumerGroupId, 
Optional.of(GroupType.CONSUMER), "consumer")
+      val shareGroupListing = new GroupListing(shareGroupId, 
Optional.of(GroupType.SHARE), "share")
+
+      var listGroupsResult = client.listGroups()
+      assertTrue(listGroupsResult.errors().get().isEmpty)
+      assertEquals(Set(classicGroupListing, consumerGroupListing, 
shareGroupListing), listGroupsResult.all().get().asScala.toSet)
+      assertEquals(Set(classicGroupListing, consumerGroupListing, 
shareGroupListing), listGroupsResult.valid().get().asScala.toSet)
+
+      listGroupsResult = client.listGroups(new 
ListGroupsOptions().withTypes(java.util.Set.of(GroupType.CLASSIC)))
+      assertTrue(listGroupsResult.errors().get().isEmpty)
+      assertEquals(Set(classicGroupListing), 
listGroupsResult.all().get().asScala.toSet)
+      assertEquals(Set(classicGroupListing), 
listGroupsResult.valid().get().asScala.toSet)
+
+      listGroupsResult = client.listGroups(new 
ListGroupsOptions().withTypes(java.util.Set.of(GroupType.CONSUMER)))
+      assertTrue(listGroupsResult.errors().get().isEmpty)
+      assertEquals(Set(consumerGroupListing), 
listGroupsResult.all().get().asScala.toSet)
+      assertEquals(Set(consumerGroupListing), 
listGroupsResult.valid().get().asScala.toSet)
+
+      listGroupsResult = client.listGroups(new 
ListGroupsOptions().withTypes(java.util.Set.of(GroupType.SHARE)))
+      assertTrue(listGroupsResult.errors().get().isEmpty)
+      assertEquals(Set(shareGroupListing), 
listGroupsResult.all().get().asScala.toSet)
+      assertEquals(Set(shareGroupListing), 
listGroupsResult.valid().get().asScala.toSet)
+    } finally {
+      Utils.closeQuietly(classicGroup, "classicGroup")
+      Utils.closeQuietly(consumerGroup, "consumerGroup")
+      Utils.closeQuietly(shareGroup, "shareGroup")
+      Utils.closeQuietly(client, "adminClient")
+    }
+  }
+
+  @ParameterizedTest
+  @ValueSource(strings = Array("kraft"))
+  def testDescribeClassicGroups(quorum: String): Unit = {

Review Comment:
   @FrankYang0529, please use `Admin#alterConsumerGroupOffsets` to set a 
committed offset. The coordinator will create a classic group with an empty 
protocol, known as a simple consumer group, for you.



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