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.operators.single;
  
  import org.junit.Test;
  
  import io.reactivex.rxjava3.core.*;
  import io.reactivex.rxjava3.disposables.Disposable;
  import io.reactivex.rxjava3.observers.TestObserver;
  import io.reactivex.rxjava3.processors.PublishProcessor;
  import io.reactivex.rxjava3.testsupport.TestHelper;
  
  public class SingleCacheTest extends RxJavaTest {
  
      @Test
      public void cancelImmediately() {
          PublishProcessor<Integer> pp = PublishProcessor.create();
  
          Single<Integer> cached = pp.single(-99).cache();
  
          TestObserver<Integer> to = cached.test(true);
  
          pp.onNext(1);
          pp.onComplete();
  
          to.assertEmpty();
  
          cached.test().assertResult(1);
      }
  
      @Test
      public void addRemoveRace() {
          for (int i = 0; i < TestHelper.RACE_DEFAULT_LOOPS; i++) {
              PublishProcessor<Integer> pp = PublishProcessor.create();
  
              final Single<Integer> cached = pp.single(-99).cache();
  
              final TestObserver<Integer> to1 = cached.test();
  
              Runnable r1 = new Runnable() {
                  @Override
                  public void run() {
                      to1.dispose();
                  }
              };
  
              Runnable r2 = new Runnable() {
                  @Override
                  public void run() {
                      cached.test();
                  }
              };
  
              TestHelper.race(r1, r2);
          }
      }
  
      @Test
      public void doubleDispose() {
          PublishProcessor<Integer> pp = PublishProcessor.create();
  
          final Single<Integer> cached = pp.single(-99).cache();
  
          SingleObserver<Integer> doubleDisposer = new SingleObserver<Integer>() {
  
              @Override
              public void onSubscribe(Disposable d) {
                  d.dispose();
                  d.dispose();
              }
  
              @Override
              public void onSuccess(Integer value) {
  
              }
  
              @Override
              public void onError(Throwable e) {
  
              }
          };
          cached.subscribe(doubleDisposer);
  
          cached.test();
  
          cached.subscribe(doubleDisposer);
      }
  }
  