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.subscribers;
  
  import static org.junit.Assert.*;
  import static org.mockito.ArgumentMatchers.any;
  import static org.mockito.Mockito.*;
  
  import org.junit.Test;
  import org.reactivestreams.Subscription;
  
  import io.reactivex.rxjava3.annotations.*;
  import io.reactivex.rxjava3.core.*;
  import io.reactivex.rxjava3.internal.subscriptions.*;
  import io.reactivex.rxjava3.operators.ConditionalSubscriber;
  import io.reactivex.rxjava3.operators.QueueFuseable;
  import io.reactivex.rxjava3.testsupport.*;
  
  public class BasicFuseableConditionalSubscriberTest extends RxJavaTest {
  
      @Test
      public void offerThrows() {
          ConditionalSubscriber<Integer> cs = new ConditionalSubscriber<Integer>() {
  
              @Override
              public void onSubscribe(Subscription s) {
              }
  
              @Override
              public void onNext(Integer t) {
              }
  
              @Override
              public void onError(Throwable t) {
              }
  
              @Override
              public void onComplete() {
              }
  
              @Override
              public boolean tryOnNext(Integer t) {
                  return false;
              }
          };
  
          BasicFuseableConditionalSubscriber<Integer, Integer> fcs = new BasicFuseableConditionalSubscriber<Integer, Integer>(cs) {
  
              @Override
              public boolean tryOnNext(Integer t) {
                  return false;
              }
  
              @Override
              public void onNext(Integer t) {
              }
  
              @Override
              public int requestFusion(int mode) {
                  return 0;
              }
  
              @Nullable
              @Override
              public Integer poll() throws Exception {
                  return null;
              }
          };
  
          fcs.onSubscribe(new ScalarSubscription<>(fcs, 1));
  
          TestHelper.assertNoOffer(fcs);
  
          assertFalse(fcs.isEmpty());
          fcs.clear();
          assertTrue(fcs.isEmpty());
      }
  
      @Test
      public void implementationStopsOnSubscribe() {
          @SuppressWarnings("unchecked")
          ConditionalSubscriber<Integer> ts = mock(ConditionalSubscriber.class);
  
          BasicFuseableConditionalSubscriber<Integer, Integer> bfs = new BasicFuseableConditionalSubscriber<Integer, Integer>(ts) {
  
              @Override
              protected boolean beforeDownstream() {
                  return false;
              }
  
              @Override
              public void onNext(@NonNull Integer t) {
                  ts.onNext(t);
              }
  
              @Override
              public int requestFusion(int mode) {
                  // TODO Auto-generated method stub
                  return 0;
              }
  
              @Override
              public boolean tryOnNext(@NonNull Integer t) {
                  // TODO Auto-generated method stub
                  return false;
              }
  
              @Override
              public @Nullable Integer poll() throws Throwable {
                  return null;
              }
          };
  
          bfs.onSubscribe(new BooleanSubscription());
  
          verify(ts, never()).onSubscribe(any());
      }
  
      @Test
      public void doubleOnSubscribe() {
          TestHelper.checkDoubleOnSubscribeFlowable(f -> f
                  .map(v -> v)
                  .filter(v -> true)
              );
      }
  
      @Test
      public void transitiveBoundaryFusionNone() {
          @SuppressWarnings("unchecked")
          ConditionalSubscriber<Integer> ts = mock(ConditionalSubscriber.class);
  
          BasicFuseableConditionalSubscriber<Integer, Integer> bfs = new BasicFuseableConditionalSubscriber<Integer, Integer>(ts) {
  
              @Override
              protected boolean beforeDownstream() {
                  return false;
              }
  
              @Override
              public void onNext(@NonNull Integer t) {
                  ts.onNext(t);
              }
  
              @Override
              public int requestFusion(int mode) {
                  // TODO Auto-generated method stub
                  return 0;
              }
  
              @Override
              public boolean tryOnNext(@NonNull Integer t) {
                  // TODO Auto-generated method stub
                  return false;
              }
  
              @Override
              public @Nullable Integer poll() throws Throwable {
                  return null;
              }
          };
  
          bfs.onSubscribe(new BooleanSubscription());
  
          assertEquals(QueueFuseable.NONE, bfs.transitiveBoundaryFusion(QueueFuseable.ANY));
      }
  
      @Test
      public void transitiveBoundaryFusionAsync() {
          @SuppressWarnings("unchecked")
          ConditionalSubscriber<Integer> ts = mock(ConditionalSubscriber.class);
  
          BasicFuseableConditionalSubscriber<Integer, Integer> bfs = new BasicFuseableConditionalSubscriber<Integer, Integer>(ts) {
  
              @Override
              protected boolean beforeDownstream() {
                  return false;
              }
  
              @Override
              public void onNext(@NonNull Integer t) {
                  ts.onNext(t);
              }
  
              @Override
              public int requestFusion(int mode) {
                  // TODO Auto-generated method stub
                  return 0;
              }
  
              @Override
              public boolean tryOnNext(@NonNull Integer t) {
                  // TODO Auto-generated method stub
                  return false;
              }
  
              @Override
              public @Nullable Integer poll() throws Throwable {
                  return null;
              }
          };
  
          bfs.onSubscribe(EmptySubscription.INSTANCE);
  
          assertEquals(QueueFuseable.ASYNC, bfs.transitiveBoundaryFusion(QueueFuseable.ANY));
      }
  
      @Test
      public void transitiveBoundaryFusionAsyncBoundary() {
          @SuppressWarnings("unchecked")
          ConditionalSubscriber<Integer> ts = mock(ConditionalSubscriber.class);
  
          BasicFuseableConditionalSubscriber<Integer, Integer> bfs = new BasicFuseableConditionalSubscriber<Integer, Integer>(ts) {
  
              @Override
              protected boolean beforeDownstream() {
                  return false;
              }
  
              @Override
              public void onNext(@NonNull Integer t) {
                  ts.onNext(t);
              }
  
              @Override
              public int requestFusion(int mode) {
                  // TODO Auto-generated method stub
                  return 0;
              }
  
              @Override
              public boolean tryOnNext(@NonNull Integer t) {
                  // TODO Auto-generated method stub
                  return false;
              }
  
              @Override
              public @Nullable Integer poll() throws Throwable {
                  return null;
              }
          };
  
          bfs.onSubscribe(EmptySubscription.INSTANCE);
  
          assertEquals(QueueFuseable.NONE, bfs.transitiveBoundaryFusion(QueueFuseable.ANY | QueueFuseable.BOUNDARY));
      }
  }
  