runtime/master/src/test/java/org/apache/nemo/runtime/master/scheduler/PendingTaskCollectionPointerTest.java

/*
 * 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.nemo.runtime.master.scheduler;

import org.apache.nemo.runtime.common.plan.Task;
import org.apache.reef.tang.Tang;
import org.apache.reef.tang.exceptions.InjectionException;
import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.powermock.core.classloader.annotations.PrepareForTest;
import org.powermock.modules.junit4.PowerMockRunner;

import java.util.Arrays;
import java.util.Collection;
import java.util.List;
import java.util.Optional;

import static org.junit.Assert.*;
import static org.mockito.Mockito.mock;

/**
 * Tests {@link PendingTaskCollectionPointer}
 */
@RunWith(PowerMockRunner.class)
@PrepareForTest({Task.class})
public final class PendingTaskCollectionPointerTest {
  private PendingTaskCollectionPointer pendingTaskCollectionPointer;

  private List<Task> mockTaskList() {
    final Task task = mock(Task.class);
    return Arrays.asList(task);
  }

  @Before
  public void setUp() throws InjectionException {
    this.pendingTaskCollectionPointer = Tang.Factory.getTang().newInjector()
      .getInstance(PendingTaskCollectionPointer.class);
  }

  @Test
  public void nullByDefault() {
    assertFalse(pendingTaskCollectionPointer.getAndSetNull().isPresent());
  }

  @Test
  public void setIfNull() {
    final List<Task> taskList = mockTaskList();
    pendingTaskCollectionPointer.setIfNull(taskList);
    final Optional<Collection<Task>> optional = pendingTaskCollectionPointer.getAndSetNull();
    assertTrue(optional.isPresent());
    assertEquals(taskList, optional.get());
  }

  @Test
  public void setToOverwrite() {
    final List<Task> taskList1 = mockTaskList();
    pendingTaskCollectionPointer.setIfNull(taskList1);
    final List<Task> taskList2 = mockTaskList();
    pendingTaskCollectionPointer.setToOverwrite(taskList2);
    final Optional<Collection<Task>> optional = pendingTaskCollectionPointer.getAndSetNull();
    assertTrue(optional.isPresent());
    assertEquals(taskList2, optional.get());
  }
}