content: /*
   * Licensed to the Apache Software Foundation (ASF) under one or more
   * contributor license agreements. See the NOTICE file distributed with
   * this work for additional information regarding copyright ownership.
   * The ASF licenses this file to You under the Apache License, Version 2.0
   * (the "License"); you may not use this file except in compliance with
   * the License. You may obtain a copy of the License at
   *
   *    http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  package org.apache.kafka.coordinator.group.streams;
  
  import org.apache.kafka.common.Uuid;
  import org.apache.kafka.common.errors.FencedMemberEpochException;
  import org.apache.kafka.coordinator.group.streams.TaskAssignmentTestUtil.TaskRole;
  
  import org.junit.jupiter.api.Test;
  import org.junit.jupiter.params.ParameterizedTest;
  import org.junit.jupiter.params.provider.EnumSource;
  
  import java.util.Set;
  
  import static org.apache.kafka.coordinator.group.streams.TaskAssignmentTestUtil.mkTasks;
  import static org.apache.kafka.coordinator.group.streams.TaskAssignmentTestUtil.mkTasksTuple;
  import static org.junit.jupiter.api.Assertions.assertEquals;
  import static org.junit.jupiter.api.Assertions.assertThrows;
  
  public class CurrentAssignmentBuilderTest {
  
      private static final String SUBTOPOLOGY_ID1 = Uuid.randomUuid().toString();
      private static final String SUBTOPOLOGY_ID2 = Uuid.randomUuid().toString();
      private static final String PROCESS_ID = "process_id";
      private static final String MEMBER_NAME = "member";
  
      @ParameterizedTest
      @EnumSource(TaskRole.class)
      public void testStableToStable(TaskRole taskRole) {
          final int memberEpoch = 10;
  
          StreamsGroupMember member =
              new StreamsGroupMember.Builder(MEMBER_NAME)
                  .setState(MemberState.STABLE)
                  .setProcessId(PROCESS_ID)
                  .setMemberEpoch(memberEpoch)
                  .setPreviousMemberEpoch(memberEpoch)
                  .setAssignedTasks(
                      mkTasksTuple(
                          taskRole,
                          mkTasks(SUBTOPOLOGY_ID1, 1, 2),
                          mkTasks(SUBTOPOLOGY_ID2, 3, 4)))
                  .setTasksPendingRevocation(TasksTuple.EMPTY)
                  .build();
  
          StreamsGroupMember updatedMember = new CurrentAssignmentBuilder(member)
              .withTargetAssignment(memberEpoch + 1, mkTasksTuple(taskRole,
                  mkTasks(SUBTOPOLOGY_ID1, 1, 2),
                  mkTasks(SUBTOPOLOGY_ID2, 3, 4)))
              .withCurrentActiveTaskProcessId((subtopologyId, partitionId) -> PROCESS_ID)
              .withCurrentStandbyTaskProcessIds(
                  (subtopologyId, partitionId) -> Set.of())
              .withCurrentWarmupTaskProcessIds((subtopologyId, partitionId) -> Set.of())
              .build();
  
          assertEquals(
              new StreamsGroupMember.Builder(MEMBER_NAME)
                  .setState(MemberState.STABLE)
                  .setProcessId(PROCESS_ID)
                  .setMemberEpoch(memberEpoch + 1)
                  .setPreviousMemberEpoch(memberEpoch)
                  .setAssignedTasks(mkTasksTuple(
                      taskRole,
                      mkTasks(SUBTOPOLOGY_ID1, 1, 2),
                      mkTasks(SUBTOPOLOGY_ID2, 3, 4)))
                  .setTasksPendingRevocation(TasksTuple.EMPTY)
                  .build(),
              updatedMember
          );
      }
  
      @ParameterizedTest
      @EnumSource(TaskRole.class)
      public void testStableToStableAtTargetEpoch(TaskRole taskRole) {
          final int memberEpoch = 10;
  
          StreamsGroupMember member =
              new StreamsGroupMember.Builder(MEMBER_NAME)
                  .setState(MemberState.STABLE)
                  .setProcessId(PROCESS_ID)
                  .setMemberEpoch(memberEpoch)
                  .setPreviousMemberEpoch(memberEpoch)
                  .setAssignedTasks(
                      mkTasksTuple(
                          taskRole,
                          mkTasks(SUBTOPOLOGY_ID1, 1, 2),
                          mkTasks(SUBTOPOLOGY_ID2, 3, 4)))
                  .setTasksPendingRevocation(TasksTuple.EMPTY)
                  .build();
  
          StreamsGroupMember updatedMember = new CurrentAssignmentBuilder(member)
              .withTargetAssignment(memberEpoch, mkTasksTuple(taskRole,
                  mkTasks(SUBTOPOLOGY_ID1, 1, 2),
                  mkTasks(SUBTOPOLOGY_ID2, 3, 4)))
              .withCurrentActiveTaskProcessId((subtopologyId, partitionId) -> PROCESS_ID)
              .withCurrentStandbyTaskProcessIds(
                  (subtopologyId, partitionId) -> Set.of())
              .withCurrentWarmupTaskProcessIds((subtopologyId, partitionId) -> Set.of())
              .build();
  
          assertEquals(
              new StreamsGroupMember.Builder(MEMBER_NAME)
                  .setState(MemberState.STABLE)
                  .setProcessId(PROCESS_ID)
                  .setMemberEpoch(memberEpoch)
                  .setPreviousMemberEpoch(memberEpoch)
                  .setAssignedTasks(mkTasksTuple(
                      taskRole,
                      mkTasks(SUBTOPOLOGY_ID1, 1, 2),
                      mkTasks(SUBTOPOLOGY_ID2, 3, 4)))
                  .setTasksPendingRevocation(TasksTuple.EMPTY)
                  .build(),
              updatedMember
          );
      }
  
      @ParameterizedTest
      @EnumSource(TaskRole.class)
      public void testStableToStableWithNewTasks(TaskRole taskRole) {
          final int memberEpoch = 10;
  
          StreamsGroupMember member = new StreamsGroupMember.Builder(MEMBER_NAME)
              .setState(MemberState.STABLE)
              .setProcessId(PROCESS_ID)
              .setMemberEpoch(memberEpoch)
              .setPreviousMemberEpoch(memberEpoch)
              .setAssignedTasks(mkTasksTuple(taskRole,
                  mkTasks(SUBTOPOLOGY_ID1, 1, 2),
                  mkTasks(SUBTOPOLOGY_ID2, 3, 4)))
              .setTasksPendingRevocation(TasksTuple.EMPTY)
              .build();
  
          StreamsGroupMember updatedMember = new CurrentAssignmentBuilder(member)
              .withTargetAssignment(memberEpoch + 1, mkTasksTuple(taskRole,
                  mkTasks(SUBTOPOLOGY_ID1, 1, 2, 4),
                  mkTasks(SUBTOPOLOGY_ID2, 3, 4, 7)))
              .withCurrentActiveTaskProcessId((subtopologyId, partitionId) -> null)
              .withCurrentStandbyTaskProcessIds(
                  (subtopologyId, partitionId) -> Set.of())
              .withCurrentWarmupTaskProcessIds((subtopologyId, partitionId) -> Set.of())
              .build();
  
          assertEquals(
              new StreamsGroupMember.Builder(MEMBER_NAME)
                  .setState(MemberState.STABLE)
                  .setProcessId(PROCESS_ID)
                  .setMemberEpoch(memberEpoch + 1)
                  .setPreviousMemberEpoch(memberEpoch)
                  .setAssignedTasks(mkTasksTuple(taskRole,
                      mkTasks(SUBTOPOLOGY_ID1, 1, 2, 4),
                      mkTasks(SUBTOPOLOGY_ID2, 3, 4, 7)))
                  .setTasksPendingRevocation(TasksTuple.EMPTY)
                  .build(),
              updatedMember
          );
      }
  
      @ParameterizedTest
      @EnumSource(TaskRole.class)
      public void testStableToUnrevokedTasks(TaskRole taskRole) {
          final int memberEpoch = 10;
  
          StreamsGroupMember member = new StreamsGroupMember.Builder(MEMBER_NAME)
              .setState(MemberState.STABLE)
              .setProcessId(PROCESS_ID)
              .setMemberEpoch(memberEpoch)
              .setPreviousMemberEpoch(memberEpoch)
              .setAssignedTasks(mkTasksTuple(taskRole,
                  mkTasks(SUBTOPOLOGY_ID1, 1, 2),
                  mkTasks(SUBTOPOLOGY_ID2, 3, 4)))
              .setTasksPendingRevocation(TasksTuple.EMPTY)
              .build();
  
          StreamsGroupMember updatedMember = new CurrentAssignmentBuilder(member)
              .withTargetAssignment(memberEpoch + 1, mkTasksTuple(taskRole,
                  mkTasks(SUBTOPOLOGY_ID1, 2, 3),
                  mkTasks(SUBTOPOLOGY_ID2, 4, 5)))
              .withCurrentActiveTaskProcessId((subtopologyId, partitionId) -> null)
              .withCurrentStandbyTaskProcessIds(
                  (subtopologyId, partitionId) -> Set.of())
              .withCurrentWarmupTaskProcessIds((subtopologyId, partitionId) -> Set.of())
              .build();
  
          assertEquals(
              new StreamsGroupMember.Builder(MEMBER_NAME)
                  .setState(MemberState.UNREVOKED_TASKS)
                  .setProcessId(PROCESS_ID)
                  .setMemberEpoch(memberEpoch)
                  .setPreviousMemberEpoch(memberEpoch)
                  .setAssignedTasks(mkTasksTuple(taskRole,
                      mkTasks(SUBTOPOLOGY_ID1, 2),
                      mkTasks(SUBTOPOLOGY_ID2, 4)))
                  .setTasksPendingRevocation(mkTasksTuple(taskRole,
                      mkTasks(SUBTOPOLOGY_ID1, 1),
                      mkTasks(SUBTOPOLOGY_ID2, 3)))
                  .build(),
              updatedMember
          );
      }
  
      @ParameterizedTest
      @EnumSource(TaskRole.class)
      public void testStableToUnrevokedWithEmptyAssignment(TaskRole taskRole) {
          final int memberEpoch = 10;
  
          StreamsGroupMember member =
              new StreamsGroupMember.Builder(MEMBER_NAME)
                  .setState(MemberState.STABLE)
                  .setProcessId(PROCESS_ID)
                  .setMemberEpoch(memberEpoch)
                  .setPreviousMemberEpoch(memberEpoch)
                  .setAssignedTasks(
                      mkTasksTuple(
                          taskRole,
                          mkTasks(SUBTOPOLOGY_ID1, 1, 2),
                          mkTasks(SUBTOPOLOGY_ID2, 3, 4)))
                  .setTasksPendingRevocation(TasksTuple.EMPTY)
                  .build();
  
          StreamsGroupMember updatedMember = new CurrentAssignmentBuilder(member)
              .withTargetAssignment(memberEpoch + 1, TasksTuple.EMPTY)
              .withCurrentActiveTaskProcessId((subtopologyId, partitionId) -> PROCESS_ID)
              .withCurrentStandbyTaskProcessIds(
                  (subtopologyId, partitionId) -> Set.of())
              .withCurrentWarmupTaskProcessIds((subtopologyId, partitionId) -> Set.of())
              .build();
  
          assertEquals(
              new StreamsGroupMember.Builder(MEMBER_NAME)
                  .setState(MemberState.UNREVOKED_TASKS)
                  .setProcessId(PROCESS_ID)
                  .setMemberEpoch(memberEpoch)
                  .setPreviousMemberEpoch(memberEpoch)
                  .setAssignedTasks(TasksTuple.EMPTY)
                  .setTasksPendingRevocation(
                      mkTasksTuple(
                          taskRole,
                          mkTasks(SUBTOPOLOGY_ID1, 1, 2),
                          mkTasks(SUBTOPOLOGY_ID2, 3, 4)))
                  .build(),
              updatedMember
          );
      }
  
      @ParameterizedTest
      @EnumSource(TaskRole.class)
      public void testStableToUnreleasedTasks(TaskRole taskRole) {
          final int memberEpoch = 10;
  
          StreamsGroupMember member = new StreamsGroupMember.Builder(MEMBER_NAME)
              .setState(MemberState.STABLE)
              .setProcessId(PROCESS_ID)
              .setMemberEpoch(memberEpoch)
              .setPreviousMemberEpoch(memberEpoch)
              .setAssignedTasks(mkTasksTuple(taskRole,
                  mkTasks(SUBTOPOLOGY_ID1, 1, 2),
                  mkTasks(SUBTOPOLOGY_ID2, 3, 4)))
              .setTasksPendingRevocation(TasksTuple.EMPTY)
              .build();
  
          StreamsGroupMember updatedMember = new CurrentAssignmentBuilder(member)
              .withTargetAssignment(memberEpoch + 1, mkTasksTuple(taskRole,
                  mkTasks(SUBTOPOLOGY_ID1, 1, 2, 4),
                  mkTasks(SUBTOPOLOGY_ID2, 3, 4, 7)))
              .withCurrentActiveTaskProcessId((subtopologyId, partitionId) -> PROCESS_ID)
              .withCurrentStandbyTaskProcessIds(
                  (subtopologyId, partitionId) -> Set.of())
              .withCurrentWarmupTaskProcessIds((subtopologyId, partitionId) -> Set.of())
              .build();
  
          assertEquals(
              new StreamsGroupMember.Builder(MEMBER_NAME)
                  .setState(MemberState.UNRELEASED_TASKS)
                  .setProcessId(PROCESS_ID)
                  .setMemberEpoch(memberEpoch + 1)
                  .setPreviousMemberEpoch(memberEpoch)
                  .setAssignedTasks(mkTasksTuple(taskRole,
                      mkTasks(SUBTOPOLOGY_ID1, 1, 2),
                      mkTasks(SUBTOPOLOGY_ID2, 3, 4)))
                  .setTasksPendingRevocation(TasksTuple.EMPTY)
                  .build(),
              updatedMember
          );
      }
  
      @ParameterizedTest
      @EnumSource(TaskRole.class)
      public void testStableToUnreleasedTasksWithOwnedTasksNotHavingRevokedTasks(TaskRole taskRole) {
          final int memberEpoch = 10;
  
          StreamsGroupMember member = new StreamsGroupMember.Builder(MEMBER_NAME)
              .setState(MemberState.STABLE)
              .setProcessId(PROCESS_ID)
              .setMemberEpoch(memberEpoch)
              .setPreviousMemberEpoch(memberEpoch)
              .setAssignedTasks(mkTasksTuple(taskRole,
                  mkTasks(SUBTOPOLOGY_ID1, 1, 2),
                  mkTasks(SUBTOPOLOGY_ID2, 3, 4)))
              .setTasksPendingRevocation(TasksTuple.EMPTY)
              .build();
  
          StreamsGroupMember updatedMember = new CurrentAssignmentBuilder(member)
              .withTargetAssignment(memberEpoch + 1, mkTasksTuple(taskRole,
                  mkTasks(SUBTOPOLOGY_ID1, 1, 2),
                  mkTasks(SUBTOPOLOGY_ID2, 3, 5)))
              .withCurrentActiveTaskProcessId((subtopologyId, __) ->
                  SUBTOPOLOGY_ID2.equals(subtopologyId) ? PROCESS_ID : null
              )
              .withCurrentStandbyTaskProcessIds(
                  (subtopologyId, partitionId) -> Set.of())
              .withCurrentWarmupTaskProcessIds((subtopologyId, partitionId) -> Set.of())
              .withOwnedAssignment(mkTasksTuple(taskRole))
              .build();
  
          assertEquals(
              new StreamsGroupMember.Builder(MEMBER_NAME)
                  .setState(MemberState.UNRELEASED_TASKS)
                  .setProcessId(PROCESS_ID)
                  .setMemberEpoch(memberEpoch + 1)
                  .setPreviousMemberEpoch(memberEpoch)
                  .setAssignedTasks(mkTasksTuple(taskRole,
                      mkTasks(SUBTOPOLOGY_ID1, 1, 2),
                      mkTasks(SUBTOPOLOGY_ID2, 3)))
                  .setTasksPendingRevocation(TasksTuple.EMPTY)
                  .build(),
              updatedMember
          );
      }
  
      @ParameterizedTest
      @EnumSource(TaskRole.class)
      public void testUnrevokedTasksToStable(TaskRole taskRole) {
          final int memberEpoch = 10;
  
          StreamsGroupMember member = new StreamsGroupMember.Builder(MEMBER_NAME)
              .setState(MemberState.UNREVOKED_TASKS)
              .setProcessId(PROCESS_ID)
              .setMemberEpoch(memberEpoch)
              .setPreviousMemberEpoch(memberEpoch)
              .setAssignedTasks(mkTasksTuple(taskRole,
                  mkTasks(SUBTOPOLOGY_ID1, 2, 3),
                  mkTasks(SUBTOPOLOGY_ID2, 5, 6)))
              .setTasksPendingRevocation(mkTasksTuple(taskRole,
                  mkTasks(SUBTOPOLOGY_ID1, 1),
                  mkTasks(SUBTOPOLOGY_ID2, 4)))
              .build();
  
          StreamsGroupMember updatedMember = new CurrentAssignmentBuilder(member)
              .withTargetAssignment(memberEpoch + 1, mkTasksTuple(taskRole,
                  mkTasks(SUBTOPOLOGY_ID1, 2, 3),
                  mkTasks(SUBTOPOLOGY_ID2, 5, 6)))
              .withCurrentActiveTaskProcessId((subtopologyId, partitionId) -> null)
              .withCurrentStandbyTaskProcessIds(
                  (subtopologyId, partitionId) -> Set.of())
              .withCurrentWarmupTaskProcessIds((subtopologyId, partitionId) -> Set.of())
              .withOwnedAssignment(mkTasksTuple(taskRole,
                  mkTasks(SUBTOPOLOGY_ID1, 2, 3),
                  mkTasks(SUBTOPOLOGY_ID2, 5, 6)))
              .build();
  
          assertEquals(
              new StreamsGroupMember.Builder(MEMBER_NAME)
                  .setState(MemberState.STABLE)
                  .setProcessId(PROCESS_ID)
                  .setMemberEpoch(memberEpoch + 1)
                  .setPreviousMemberEpoch(memberEpoch)
                  .setAssignedTasks(mkTasksTuple(taskRole,
                      mkTasks(SUBTOPOLOGY_ID1, 2, 3),
                      mkTasks(SUBTOPOLOGY_ID2, 5, 6)))
                  .setTasksPendingRevocation(TasksTuple.EMPTY)
                  .build(),
              updatedMember
          );
      }
  
      @ParameterizedTest
      @EnumSource(TaskRole.class)
      public void testRemainsInUnrevokedTasks(TaskRole taskRole) {
          final int memberEpoch = 10;
  
          StreamsGroupMember member = new StreamsGroupMember.Builder(MEMBER_NAME)
              .setState(MemberState.UNREVOKED_TASKS)
              .setProcessId(PROCESS_ID)
              .setMemberEpoch(memberEpoch)
              .setPreviousMemberEpoch(memberEpoch)
              .setAssignedTasks(mkTasksTuple(taskRole,
                  mkTasks(SUBTOPOLOGY_ID1, 2, 3),
                  mkTasks(SUBTOPOLOGY_ID2, 5, 6)))
              .setTasksPendingRevocation(mkTasksTuple(taskRole,
                  mkTasks(SUBTOPOLOGY_ID1, 1),
                  mkTasks(SUBTOPOLOGY_ID2, 4)))
              .build();
  
          CurrentAssignmentBuilder currentAssignmentBuilder = new CurrentAssignmentBuilder(
              member)
              .withTargetAssignment(memberEpoch + 2, mkTasksTuple(taskRole,
                  mkTasks(SUBTOPOLOGY_ID1, 3),
                  mkTasks(SUBTOPOLOGY_ID2, 6)))
              .withCurrentActiveTaskProcessId((subtopologyId, partitionId) -> null)
              .withCurrentStandbyTaskProcessIds(
                  (subtopologyId, partitionId) -> Set.of())
              .withCurrentWarmupTaskProcessIds(
                  (subtopologyId, partitionId) -> Set.of());
  
          assertEquals(
              member,
              currentAssignmentBuilder
                  .withOwnedAssignment(null)
                  .build()
          );
  
          assertEquals(
              member,
              currentAssignmentBuilder
                  .withOwnedAssignment(mkTasksTuple(taskRole,
                      mkTasks(SUBTOPOLOGY_ID1, 1, 2, 3),
                      mkTasks(SUBTOPOLOGY_ID2, 5, 6)))
                  .build()
          );
  
          assertEquals(
              member,
              currentAssignmentBuilder
                  .withOwnedAssignment(mkTasksTuple(taskRole,
                      mkTasks(SUBTOPOLOGY_ID1, 2, 3),
                      mkTasks(SUBTOPOLOGY_ID2, 4, 5, 6)))
                  .build()
          );
      }
  
      @ParameterizedTest
      @EnumSource(TaskRole.class)
      public void testUnrevokedTasksToUnrevokedTasks(TaskRole taskRole) {
          final int memberEpoch = 10;
  
          StreamsGroupMember member = new StreamsGroupMember.Builder(MEMBER_NAME)
              .setState(MemberState.UNREVOKED_TASKS)
              .setProcessId(PROCESS_ID)
              .setMemberEpoch(memberEpoch)
              .setPreviousMemberEpoch(memberEpoch)
              .setAssignedTasks(mkTasksTuple(taskRole,
                  mkTasks(SUBTOPOLOGY_ID1, 2, 3),
                  mkTasks(SUBTOPOLOGY_ID2, 5, 6)))
              .setTasksPendingRevocation(mkTasksTuple(taskRole,
                  mkTasks(SUBTOPOLOGY_ID1, 1),
                  mkTasks(SUBTOPOLOGY_ID2, 4)))
              .build();
  
          StreamsGroupMember updatedMember = new CurrentAssignmentBuilder(member)
              .withTargetAssignment(memberEpoch + 2, mkTasksTuple(taskRole,
                  mkTasks(SUBTOPOLOGY_ID1, 3),
                  mkTasks(SUBTOPOLOGY_ID2, 6)))
              .withCurrentActiveTaskProcessId((subtopologyId, partitionId) -> null)
              .withOwnedAssignment(mkTasksTuple(taskRole,
                  mkTasks(SUBTOPOLOGY_ID1, 2, 3),
                  mkTasks(SUBTOPOLOGY_ID2, 5, 6)))
              .build();
  
          assertEquals(
              new StreamsGroupMember.Builder(MEMBER_NAME)
                  .setState(MemberState.UNREVOKED_TASKS)
                  .setProcessId(PROCESS_ID)
                  .setMemberEpoch(memberEpoch + 1)
                  .setPreviousMemberEpoch(memberEpoch)
                  .setAssignedTasks(mkTasksTuple(taskRole,
                      mkTasks(SUBTOPOLOGY_ID1, 3),
                      mkTasks(SUBTOPOLOGY_ID2, 6)))
                  .setTasksPendingRevocation(mkTasksTuple(taskRole,
                      mkTasks(SUBTOPOLOGY_ID1, 2),
                      mkTasks(SUBTOPOLOGY_ID2, 5)))
                  .build(),
              updatedMember
          );
      }
  
      @ParameterizedTest
      @EnumSource(TaskRole.class)
      public void testUnrevokedTasksToUnreleasedTasks(TaskRole taskRole) {
          final int memberEpoch = 11;
  
          StreamsGroupMember member = new StreamsGroupMember.Builder(MEMBER_NAME)
              .setState(MemberState.UNREVOKED_TASKS)
              .setProcessId(PROCESS_ID)
              .setMemberEpoch(memberEpoch)
              .setPreviousMemberEpoch(memberEpoch - 1)
              .setAssignedTasks(mkTasksTuple(taskRole,
                  mkTasks(SUBTOPOLOGY_ID1, 2, 3),
                  mkTasks(SUBTOPOLOGY_ID2, 5, 6)))
              .setTasksPendingRevocation(mkTasksTuple(taskRole,
                  mkTasks(SUBTOPOLOGY_ID1, 1),
                  mkTasks(SUBTOPOLOGY_ID2, 4)))
              .build();
  
          StreamsGroupMember updatedMember = new CurrentAssignmentBuilder(member)
              .withTargetAssignment(memberEpoch, mkTasksTuple(taskRole,
                  mkTasks(SUBTOPOLOGY_ID1, 2, 3, 4),
                  mkTasks(SUBTOPOLOGY_ID2, 5, 6, 7)))
              .withCurrentActiveTaskProcessId((subtopologyId, partitionId) -> PROCESS_ID)
              .withCurrentStandbyTaskProcessIds(
                  (subtopologyId, partitionId) -> Set.of())
              .withCurrentWarmupTaskProcessIds((subtopologyId, partitionId) -> Set.of())
              .withOwnedAssignment(mkTasksTuple(taskRole,
                  mkTasks(SUBTOPOLOGY_ID1, 2, 3),
                  mkTasks(SUBTOPOLOGY_ID2, 5, 6))
              )
              .build();
  
          assertEquals(
              new StreamsGroupMember.Builder(MEMBER_NAME)
                  .setState(MemberState.UNRELEASED_TASKS)
                  .setProcessId(PROCESS_ID)
                  .setMemberEpoch(memberEpoch)
                  .setPreviousMemberEpoch(memberEpoch)
                  .setAssignedTasks(mkTasksTuple(taskRole,
                      mkTasks(SUBTOPOLOGY_ID1, 2, 3),
                      mkTasks(SUBTOPOLOGY_ID2, 5, 6)))
                  .setTasksPendingRevocation(TasksTuple.EMPTY)
                  .build(),
              updatedMember
          );
      }
  
      @ParameterizedTest
      @EnumSource(TaskRole.class)
      public void testUnreleasedTasksToStable(TaskRole taskRole) {
          final int memberEpoch = 11;
  
          StreamsGroupMember member = new StreamsGroupMember.Builder(MEMBER_NAME)
              .setState(MemberState.UNRELEASED_TASKS)
              .setProcessId("process1")
              .setMemberEpoch(memberEpoch)
              .setPreviousMemberEpoch(memberEpoch)
              .setAssignedTasks(mkTasksTuple(taskRole,
                  mkTasks(SUBTOPOLOGY_ID1, 2, 3),
                  mkTasks(SUBTOPOLOGY_ID2, 5, 6)))
              .setTasksPendingRevocation(TasksTuple.EMPTY)
              .build();
  
          StreamsGroupMember updatedMember = new CurrentAssignmentBuilder(member)
              .withTargetAssignment(memberEpoch + 1, mkTasksTuple(taskRole,
                  mkTasks(SUBTOPOLOGY_ID1, 2, 3),
                  mkTasks(SUBTOPOLOGY_ID2, 5, 6)))
              .withCurrentActiveTaskProcessId((subtopologyId, partitionId) -> PROCESS_ID)
              .withCurrentStandbyTaskProcessIds(
                  (subtopologyId, partitionId) -> Set.of(PROCESS_ID))
              .withCurrentWarmupTaskProcessIds((subtopologyId, partitionId) ->
                  Set.of(PROCESS_ID))
              .build();
  
          assertEquals(
              new StreamsGroupMember.Builder(MEMBER_NAME)
                  .setState(MemberState.STABLE)
                  .setProcessId("process1")
                  .setMemberEpoch(memberEpoch + 1)
                  .setPreviousMemberEpoch(memberEpoch)
                  .setAssignedTasks(mkTasksTuple(taskRole,
                      mkTasks(SUBTOPOLOGY_ID1, 2, 3),
                      mkTasks(SUBTOPOLOGY_ID2, 5, 6)))
                  .setTasksPendingRevocation(TasksTuple.EMPTY)
                  .build(),
              updatedMember
          );
      }
  
      @ParameterizedTest
      @EnumSource(TaskRole.class)
      public void testUnreleasedTasksToStableWithNewTasks(TaskRole taskRole) {
          int memberEpoch = 11;
  
          StreamsGroupMember member = new StreamsGroupMember.Builder(MEMBER_NAME)
              .setState(MemberState.UNRELEASED_TASKS)
              .setProcessId("process1")
              .setMemberEpoch(memberEpoch)
              .setPreviousMemberEpoch(memberEpoch)
              .setAssignedTasks(mkTasksTuple(taskRole,
                  mkTasks(SUBTOPOLOGY_ID1, 2, 3),
                  mkTasks(SUBTOPOLOGY_ID2, 5, 6)))
              .setTasksPendingRevocation(TasksTuple.EMPTY)
              .build();
  
          StreamsGroupMember updatedMember = new CurrentAssignmentBuilder(member)
              .withTargetAssignment(memberEpoch, mkTasksTuple(taskRole,
                  mkTasks(SUBTOPOLOGY_ID1, 2, 3, 4),
                  mkTasks(SUBTOPOLOGY_ID2, 5, 6, 7)))
              .withCurrentActiveTaskProcessId((subtopologyId, partitionId) -> null)
              .withCurrentStandbyTaskProcessIds(
                  (subtopologyId, partitionId) -> Set.of())
              .withCurrentWarmupTaskProcessIds((subtopologyId, partitionId) -> Set.of())
              .build();
  
          assertEquals(
              new StreamsGroupMember.Builder(MEMBER_NAME)
                  .setState(MemberState.STABLE)
                  .setProcessId("process1")
                  .setMemberEpoch(memberEpoch)
                  .setPreviousMemberEpoch(memberEpoch)
                  .setAssignedTasks(mkTasksTuple(taskRole,
                      mkTasks(SUBTOPOLOGY_ID1, 2, 3, 4),
                      mkTasks(SUBTOPOLOGY_ID2, 5, 6, 7)))
                  .setTasksPendingRevocation(TasksTuple.EMPTY)
                  .build(),
              updatedMember
          );
      }
  
      @ParameterizedTest
      @EnumSource(TaskRole.class)
      public void testUnreleasedTasksToUnreleasedTasks(TaskRole taskRole) {
          int memberEpoch = 11;
  
          StreamsGroupMember member = new StreamsGroupMember.Builder(MEMBER_NAME)
              .setState(MemberState.UNRELEASED_TASKS)
              .setProcessId(PROCESS_ID)
              .setMemberEpoch(memberEpoch)
              .setPreviousMemberEpoch(memberEpoch)
              .setAssignedTasks(mkTasksTuple(taskRole,
                  mkTasks(SUBTOPOLOGY_ID1, 2, 3),
                  mkTasks(SUBTOPOLOGY_ID2, 5, 6)))
              .setTasksPendingRevocation(TasksTuple.EMPTY)
              .build();
  
          StreamsGroupMember updatedMember = new CurrentAssignmentBuilder(member)
              .withTargetAssignment(memberEpoch, mkTasksTuple(taskRole,
                  mkTasks(SUBTOPOLOGY_ID1, 2, 3, 4),
                  mkTasks(SUBTOPOLOGY_ID2, 5, 6, 7)))
              .withCurrentActiveTaskProcessId((subtopologyId, partitionId) -> PROCESS_ID)
              .withCurrentStandbyTaskProcessIds(
                  (subtopologyId, partitionId) -> Set.of(PROCESS_ID))
              .withCurrentWarmupTaskProcessIds(
                  (subtopologyId, partitionId) -> Set.of(PROCESS_ID))
              .build();
  
          assertEquals(member, updatedMember);
      }
  
      @ParameterizedTest
      @EnumSource(TaskRole.class)
      public void testUnreleasedTasksToUnreleasedTasksOtherUnreleasedTaskRole(TaskRole taskRole) {
          int memberEpoch = 11;
  
          // The unreleased task is owned by a task of a different role on the same process.
          StreamsGroupMember member = new StreamsGroupMember.Builder(MEMBER_NAME)
              .setState(MemberState.UNRELEASED_TASKS)
              .setProcessId(PROCESS_ID)
              .setMemberEpoch(memberEpoch)
              .setPreviousMemberEpoch(memberEpoch)
              .setAssignedTasks(mkTasksTuple(taskRole,
                  mkTasks(SUBTOPOLOGY_ID1, 2, 3),
                  mkTasks(SUBTOPOLOGY_ID2, 5, 6)))
              .setTasksPendingRevocation(TasksTuple.EMPTY)
              .build();
  
          StreamsGroupMember updatedMember = new CurrentAssignmentBuilder(member)
              .withTargetAssignment(memberEpoch, mkTasksTuple(taskRole,
                  mkTasks(SUBTOPOLOGY_ID1, 2, 3, 4),
                  mkTasks(SUBTOPOLOGY_ID2, 5, 6, 7)))
              .withCurrentActiveTaskProcessId((subtopologyId, partitionId) -> null)
              .withCurrentStandbyTaskProcessIds(
                  (subtopologyId, partitionId) -> (taskRole == TaskRole.STANDBY)
                      ? Set.of() : Set.of(PROCESS_ID))
              .withCurrentWarmupTaskProcessIds(
                  (subtopologyId, partitionId) -> (taskRole == TaskRole.STANDBY)
                      ? Set.of(PROCESS_ID) : Set.of())
              .build();
  
          assertEquals(member, updatedMember);
      }
  
      @Test
      public void testUnreleasedTasksToUnreleasedTasksAnyActiveOwner() {
          int memberEpoch = 11;
  
          // The unreleased task remains unreleased, because it is owned by any other instance in
          // an active role, no matter the process.
          // The task that is not unreleased can be assigned.
          StreamsGroupMember member = new StreamsGroupMember.Builder(MEMBER_NAME)
              .setState(MemberState.UNRELEASED_TASKS)
              .setProcessId(PROCESS_ID)
              .setMemberEpoch(memberEpoch)
              .setPreviousMemberEpoch(memberEpoch)
              .setAssignedTasks(mkTasksTuple(TaskRole.ACTIVE,
                  mkTasks(SUBTOPOLOGY_ID1, 2, 3),
                  mkTasks(SUBTOPOLOGY_ID2, 5, 6)))
              .build();
  
          StreamsGroupMember expectedMember = new StreamsGroupMember.Builder(MEMBER_NAME)
              .setState(MemberState.UNRELEASED_TASKS)
              .setProcessId(PROCESS_ID)
              .setMemberEpoch(memberEpoch)
              .setPreviousMemberEpoch(memberEpoch)
              .setAssignedTasks(mkTasksTuple(TaskRole.ACTIVE,
                  mkTasks(SUBTOPOLOGY_ID1, 2, 3),
                  mkTasks(SUBTOPOLOGY_ID2, 5, 6, 7)))
              .setTasksPendingRevocation(TasksTuple.EMPTY)
              .build();
  
          StreamsGroupMember updatedMember = new CurrentAssignmentBuilder(member)
              .withTargetAssignment(memberEpoch, mkTasksTuple(TaskRole.ACTIVE,
                  mkTasks(SUBTOPOLOGY_ID1, 2, 3, 4),
                  mkTasks(SUBTOPOLOGY_ID2, 5, 6, 7)))
              .withCurrentActiveTaskProcessId((subtopologyId, partitionId) ->
                  (subtopologyId.equals(SUBTOPOLOGY_ID1) && partitionId == 4) ? "anyOtherProcess"
                      : null)
              .withCurrentStandbyTaskProcessIds(
                  (subtopologyId, partitionId) -> Set.of())
              .withCurrentWarmupTaskProcessIds(
                  (subtopologyId, partitionId) -> Set.of())
              .build();
  
          assertEquals(expectedMember, updatedMember);
      }
  
      @ParameterizedTest
      @EnumSource(TaskRole.class)
      public void testUnreleasedTasksToUnrevokedTasks(TaskRole taskRole) {
          int memberEpoch = 11;
  
          StreamsGroupMember member = new StreamsGroupMember.Builder(MEMBER_NAME)
              .setState(MemberState.UNRELEASED_TASKS)
              .setProcessId("process1")
              .setMemberEpoch(memberEpoch)
              .setPreviousMemberEpoch(memberEpoch)
              .setAssignedTasks(mkTasksTuple(taskRole,
                  mkTasks(SUBTOPOLOGY_ID1, 2, 3),
                  mkTasks(SUBTOPOLOGY_ID2, 5, 6)))
              .setTasksPendingRevocation(mkTasksTuple(TaskRole.ACTIVE,
                  mkTasks(SUBTOPOLOGY_ID1, 4),
                  mkTasks(SUBTOPOLOGY_ID2, 7)))
              .build();
  
          StreamsGroupMember updatedMember = new CurrentAssignmentBuilder(member)
              .withTargetAssignment(memberEpoch + 1, mkTasksTuple(taskRole,
                  mkTasks(SUBTOPOLOGY_ID1, 3),
                  mkTasks(SUBTOPOLOGY_ID2, 6)))
              .withCurrentActiveTaskProcessId((subtopologyId, partitionId) -> PROCESS_ID)
              .withCurrentStandbyTaskProcessIds(
                  (subtopologyId, partitionId) -> Set.of())
              .withCurrentWarmupTaskProcessIds((subtopologyId, partitionId) -> Set.of())
              .build();
  
          assertEquals(
              new StreamsGroupMember.Builder(MEMBER_NAME)
                  .setState(MemberState.UNREVOKED_TASKS)
                  .setProcessId("process1")
                  .setMemberEpoch(memberEpoch)
                  .setPreviousMemberEpoch(memberEpoch)
                  .setAssignedTasks(mkTasksTuple(taskRole,
                      mkTasks(SUBTOPOLOGY_ID1, 3),
                      mkTasks(SUBTOPOLOGY_ID2, 6)))
                  .setTasksPendingRevocation(mkTasksTuple(taskRole,
                      mkTasks(SUBTOPOLOGY_ID1, 2),
                      mkTasks(SUBTOPOLOGY_ID2, 5)))
                  .build(),
              updatedMember
          );
      }
  
      @ParameterizedTest
      @EnumSource(TaskRole.class)
      public void testUnknownState(TaskRole taskRole) {
          int memberEpoch = 11;
  
          StreamsGroupMember member = new StreamsGroupMember.Builder(MEMBER_NAME)
              .setState(MemberState.UNKNOWN)
              .setMemberEpoch(memberEpoch)
              .setPreviousMemberEpoch(memberEpoch)
              .setProcessId(PROCESS_ID)
              .setAssignedTasks(mkTasksTuple(taskRole,
                  mkTasks(SUBTOPOLOGY_ID1, 3),
                  mkTasks(SUBTOPOLOGY_ID2, 6)))
              .setTasksPendingRevocation(mkTasksTuple(taskRole,
                  mkTasks(SUBTOPOLOGY_ID1, 2),
                  mkTasks(SUBTOPOLOGY_ID2, 5)))
              .build();
  
          // When the member is in an unknown state, the member is first to force
          // a reset of the client side member state.
          assertThrows(FencedMemberEpochException.class, () -> new CurrentAssignmentBuilder(member)
              .withTargetAssignment(memberEpoch + 1, mkTasksTuple(taskRole,
                  mkTasks(SUBTOPOLOGY_ID1, 3),
                  mkTasks(SUBTOPOLOGY_ID2, 6)))
              .withCurrentActiveTaskProcessId((subtopologyId, partitionId) -> PROCESS_ID)
              .build());
  
          // Then the member rejoins with no owned tasks.
          StreamsGroupMember updatedMember = new CurrentAssignmentBuilder(member)
              .withTargetAssignment(memberEpoch + 1, mkTasksTuple(taskRole,
                  mkTasks(SUBTOPOLOGY_ID1, 3),
                  mkTasks(SUBTOPOLOGY_ID2, 6)))
              .withCurrentActiveTaskProcessId((subtopologyId, partitionId) -> PROCESS_ID)
              .withCurrentStandbyTaskProcessIds(
                  (subtopologyId, partitionId) -> Set.of())
              .withCurrentWarmupTaskProcessIds((subtopologyId, partitionId) -> Set.of())
              .withOwnedAssignment(mkTasksTuple(taskRole))
              .build();
  
          assertEquals(
              new StreamsGroupMember.Builder(MEMBER_NAME)
                  .setState(MemberState.STABLE)
                  .setProcessId(PROCESS_ID)
                  .setMemberEpoch(memberEpoch + 1)
                  .setPreviousMemberEpoch(memberEpoch)
                  .setAssignedTasks(mkTasksTuple(taskRole,
                      mkTasks(SUBTOPOLOGY_ID1, 3),
                      mkTasks(SUBTOPOLOGY_ID2, 6)))
                  .setTasksPendingRevocation(TasksTuple.EMPTY)
                  .build(),
              updatedMember
          );
      }
  }
  