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.streams.processor.internals;
  
  import org.apache.kafka.streams.processor.TaskId;
  
  import org.junit.jupiter.api.Test;
  
  import java.util.concurrent.CompletableFuture;
  
  import static org.apache.kafka.streams.processor.internals.TaskAndAction.Action.ADD;
  import static org.apache.kafka.streams.processor.internals.TaskAndAction.Action.REMOVE;
  import static org.apache.kafka.streams.processor.internals.TaskAndAction.createAddTask;
  import static org.apache.kafka.streams.processor.internals.TaskAndAction.createRemoveTask;
  import static org.junit.jupiter.api.Assertions.assertEquals;
  import static org.junit.jupiter.api.Assertions.assertThrows;
  import static org.junit.jupiter.api.Assertions.assertTrue;
  import static org.mockito.Mockito.mock;
  
  class TaskAndActionTest {
  
      @Test
      public void shouldCreateAddTaskAction() {
          final StreamTask task = mock(StreamTask.class);
  
          final TaskAndAction addTask = createAddTask(task);
  
          assertEquals(ADD, addTask.action());
          assertEquals(task, addTask.task());
          final Exception exceptionForTaskId = assertThrows(IllegalStateException.class, addTask::taskId);
          assertEquals("Action type ADD cannot have a task ID!", exceptionForTaskId.getMessage());
          final Exception exceptionForFutureForRemove = assertThrows(IllegalStateException.class, addTask::futureForRemove);
          assertEquals("Action type ADD cannot have a future with a single result!", exceptionForFutureForRemove.getMessage());
      }
  
      @Test
      public void shouldCreateRemoveTaskAction() {
          final TaskId taskId = new TaskId(0, 0);
          final CompletableFuture<StateUpdater.RemovedTaskResult> future = new CompletableFuture<>();
  
          final TaskAndAction removeTask = createRemoveTask(taskId, future);
  
          assertEquals(REMOVE, removeTask.action());
          assertEquals(taskId, removeTask.taskId());
          assertEquals(future, removeTask.futureForRemove());
          final Exception exceptionForTask = assertThrows(IllegalStateException.class, removeTask::task);
          assertEquals("Action type REMOVE cannot have a task!", exceptionForTask.getMessage());
      }
  
      @Test
      public void shouldThrowIfAddTaskActionIsCreatedWithNullTask() {
          final Exception exception = assertThrows(NullPointerException.class, () -> createAddTask(null));
          assertTrue(exception.getMessage().contains("Task to add is null!"));
      }
  
      @Test
      public void shouldThrowIfRemoveTaskActionIsCreatedWithNullTaskId() {
          final Exception exception = assertThrows(
              NullPointerException.class,
              () -> createRemoveTask(null, new CompletableFuture<>())
          );
          assertTrue(exception.getMessage().contains("Task ID of task to remove is null!"));
      }
  
      @Test
      public void shouldThrowIfRemoveTaskActionIsCreatedWithNullFuture() {
          final Exception exception = assertThrows(
              NullPointerException.class,
              () -> createRemoveTask(new TaskId(0, 0), null)
          );
          assertTrue(exception.getMessage().contains("Future for task to remove is null!"));
      }
  }