code: /*
   * Copyright (c) 2016-present, RxJava Contributors.
   *
   * Licensed 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 io.reactivex.rxjava3.internal.disposables;
  
  import static org.junit.Assert.*;
  
  import java.util.List;
  import java.util.concurrent.atomic.AtomicReference;
  
  import org.junit.Test;
  
  import io.reactivex.rxjava3.core.RxJavaTest;
  import io.reactivex.rxjava3.disposables.*;
  import io.reactivex.rxjava3.plugins.RxJavaPlugins;
  import io.reactivex.rxjava3.testsupport.TestHelper;
  
  public class DisposableHelperTest extends RxJavaTest {
      @Test
      public void enumMethods() {
          assertEquals(1, DisposableHelper.values().length);
          assertNotNull(DisposableHelper.valueOf("DISPOSED"));
      }
  
      @Test
      public void innerDisposed() {
          assertTrue(DisposableHelper.DISPOSED.isDisposed());
          DisposableHelper.DISPOSED.dispose();
          assertTrue(DisposableHelper.DISPOSED.isDisposed());
      }
  
      @Test
      public void validationNull() {
          List<Throwable> list = TestHelper.trackPluginErrors();
          try {
              assertFalse(DisposableHelper.validate(null, null));
  
              TestHelper.assertError(list, 0, NullPointerException.class, "next is null");
          } finally {
              RxJavaPlugins.reset();
          }
      }
  
      @Test
      public void disposeRace() {
          for (int i = 0; i < TestHelper.RACE_DEFAULT_LOOPS; i++) {
              final AtomicReference<Disposable> d = new AtomicReference<>();
  
              Runnable r = new Runnable() {
                  @Override
                  public void run() {
                      DisposableHelper.dispose(d);
                  }
              };
  
              TestHelper.race(r, r);
          }
      }
  
      @Test
      public void setReplace() {
          for (int i = 0; i < TestHelper.RACE_DEFAULT_LOOPS; i++) {
              final AtomicReference<Disposable> d = new AtomicReference<>();
  
              Runnable r = new Runnable() {
                  @Override
                  public void run() {
                      DisposableHelper.replace(d, Disposable.empty());
                  }
              };
  
              TestHelper.race(r, r);
          }
      }
  
      @Test
      public void setRace() {
          for (int i = 0; i < TestHelper.RACE_DEFAULT_LOOPS; i++) {
              final AtomicReference<Disposable> d = new AtomicReference<>();
  
              Runnable r = new Runnable() {
                  @Override
                  public void run() {
                      DisposableHelper.set(d, Disposable.empty());
                  }
              };
  
              TestHelper.race(r, r);
          }
      }
  
      @Test
      public void setReplaceNull() {
          final AtomicReference<Disposable> d = new AtomicReference<>();
  
          DisposableHelper.dispose(d);
  
          assertFalse(DisposableHelper.set(d, null));
          assertFalse(DisposableHelper.replace(d, null));
      }
  
      @Test
      public void dispose() {
          Disposable u = Disposable.empty();
          final AtomicReference<Disposable> d = new AtomicReference<>(u);
  
          DisposableHelper.dispose(d);
  
          assertTrue(u.isDisposed());
      }
  
      @Test
      public void trySet() {
          AtomicReference<Disposable> ref = new AtomicReference<>();
  
          Disposable d1 = Disposable.empty();
  
          assertTrue(DisposableHelper.trySet(ref, d1));
  
          Disposable d2 = Disposable.empty();
  
          assertFalse(DisposableHelper.trySet(ref, d2));
  
          assertFalse(d1.isDisposed());
  
          assertFalse(d2.isDisposed());
  
          DisposableHelper.dispose(ref);
  
          Disposable d3 = Disposable.empty();
  
          assertFalse(DisposableHelper.trySet(ref, d3));
  
          assertTrue(d3.isDisposed());
      }
  }
  