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.subscriptions;
  
  import static org.junit.Assert.*;
  
  import org.junit.Test;
  
  import io.reactivex.rxjava3.core.RxJavaTest;
  import io.reactivex.rxjava3.operators.QueueFuseable;
  import io.reactivex.rxjava3.subscribers.TestSubscriber;
  import io.reactivex.rxjava3.testsupport.TestHelper;
  
  public class DeferredScalarSubscriptionTest extends RxJavaTest {
  
      @Test
      public void queueSubscriptionSyncRejected() {
          DeferredScalarSubscription<Integer> ds = new DeferredScalarSubscription<>(new TestSubscriber<>());
  
          assertEquals(QueueFuseable.NONE, ds.requestFusion(QueueFuseable.SYNC));
      }
  
      @Test
      public void clear() {
          DeferredScalarSubscription<Integer> ds = new DeferredScalarSubscription<>(new TestSubscriber<>());
  
          ds.value = 1;
  
          ds.clear();
  
          assertEquals(DeferredScalarSubscription.FUSED_CONSUMED, ds.get());
          assertNull(ds.value);
      }
  
      @Test
      public void cancel() {
          DeferredScalarSubscription<Integer> ds = new DeferredScalarSubscription<>(new TestSubscriber<>());
  
          assertTrue(ds.tryCancel());
  
          assertFalse(ds.tryCancel());
      }
  
      @Test
      public void completeCancelRace() {
          for (int i = 0; i < TestHelper.RACE_DEFAULT_LOOPS; i++) {
              final DeferredScalarSubscription<Integer> ds = new DeferredScalarSubscription<>(new TestSubscriber<>());
  
              Runnable r1 = new Runnable() {
                  @Override
                  public void run() {
                      ds.complete(1);
                  }
              };
  
              Runnable r2 = new Runnable() {
                  @Override
                  public void run() {
                      ds.cancel();
                  }
              };
  
              TestHelper.race(r1, r2);
          }
      }
  
      @Test
      public void requestClearRace() {
          for (int i = 0; i < TestHelper.RACE_LONG_LOOPS; i++) {
              TestSubscriber<Integer> ts = new TestSubscriber<>(0L);
  
              final DeferredScalarSubscription<Integer> ds = new DeferredScalarSubscription<>(ts);
              ts.onSubscribe(ds);
              ds.complete(1);
  
              Runnable r1 = new Runnable() {
                  @Override
                  public void run() {
                      ds.request(1);
                  }
              };
  
              Runnable r2 = new Runnable() {
                  @Override
                  public void run() {
                      ds.value = null;
                  }
              };
  
              TestHelper.race(r1, r2);
  
              if (ts.values().size() >= 1) {
                  ts.assertValue(1);
              }
          }
      }
  
      @Test
      public void requestCancelRace() {
          for (int i = 0; i < TestHelper.RACE_LONG_LOOPS; i++) {
              TestSubscriber<Integer> ts = new TestSubscriber<>(0L);
  
              final DeferredScalarSubscription<Integer> ds = new DeferredScalarSubscription<>(ts);
              ts.onSubscribe(ds);
              ds.complete(1);
  
              Runnable r1 = new Runnable() {
                  @Override
                  public void run() {
                      ds.request(1);
                  }
              };
  
              Runnable r2 = new Runnable() {
                  @Override
                  public void run() {
                      ds.cancel();
                  }
              };
  
              TestHelper.race(r1, r2);
  
              if (ts.values().size() >= 1) {
                  ts.assertValue(1);
              }
          }
      }
  }
  