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.observable;
  
  import static org.junit.Assert.*;
  
  import java.util.*;
  import java.util.concurrent.TimeUnit;
  
  import org.junit.Test;
  
  import io.reactivex.rxjava3.core.*;
  import io.reactivex.rxjava3.core.Observable;
  import io.reactivex.rxjava3.core.Observer;
  import io.reactivex.rxjava3.disposables.Disposable;
  import io.reactivex.rxjava3.exceptions.TestException;
  import io.reactivex.rxjava3.internal.operators.observable.BlockingObservableIterable.BlockingObservableIterator;
  import io.reactivex.rxjava3.schedulers.Schedulers;
  import io.reactivex.rxjava3.subjects.PublishSubject;
  
  public class BlockingObservableToIteratorTest extends RxJavaTest {
  
      @Test
      public void toIterator() {
          Observable<String> obs = Observable.just("one", "two", "three");
  
          Iterator<String> it = obs.blockingIterable().iterator();
  
          assertTrue(it.hasNext());
          assertEquals("one", it.next());
  
          assertTrue(it.hasNext());
          assertEquals("two", it.next());
  
          assertTrue(it.hasNext());
          assertEquals("three", it.next());
  
          assertFalse(it.hasNext());
  
      }
  
      @Test(expected = TestException.class)
      public void toIteratorWithException() {
          Observable<String> obs = Observable.unsafeCreate(new ObservableSource<String>() {
  
              @Override
              public void subscribe(Observer<? super String> observer) {
                  observer.onSubscribe(Disposable.empty());
                  observer.onNext("one");
                  observer.onError(new TestException());
              }
          });
  
          Iterator<String> it = obs.blockingIterable().iterator();
  
          assertTrue(it.hasNext());
          assertEquals("one", it.next());
  
          assertTrue(it.hasNext());
          it.next();
      }
  
      @Test
      public void dispose() {
          BlockingObservableIterator<Integer> it = new BlockingObservableIterator<>(128);
  
          assertFalse(it.isDisposed());
  
          it.dispose();
  
          assertTrue(it.isDisposed());
      }
  
      @Test
      public void interruptWait() {
          BlockingObservableIterator<Integer> it = new BlockingObservableIterator<>(128);
  
          try {
              Thread.currentThread().interrupt();
  
              it.hasNext();
          } catch (RuntimeException ex) {
              assertTrue(ex.toString(), ex.getCause() instanceof InterruptedException);
          }
      }
  
      @Test(expected = NoSuchElementException.class)
      public void emptyThrowsNoSuch() {
          BlockingObservableIterator<Integer> it = new BlockingObservableIterator<>(128);
          it.onComplete();
          it.next();
      }
  
      @Test(expected = UnsupportedOperationException.class)
      public void remove() {
          BlockingObservableIterator<Integer> it = new BlockingObservableIterator<>(128);
          it.remove();
      }
  
      @Test(expected = NoSuchElementException.class)
      public void disposedIteratorHasNextReturns() {
          Iterator<Integer> it = PublishSubject.<Integer>create()
                  .blockingIterable().iterator();
          ((Disposable)it).dispose();
          assertFalse(it.hasNext());
          it.next();
      }
  
      @Test
      public void asyncDisposeUnblocks() {
          final Iterator<Integer> it = PublishSubject.<Integer>create()
                  .blockingIterable().iterator();
  
          Schedulers.single().scheduleDirect(new Runnable() {
              @Override
              public void run() {
                  ((Disposable)it).dispose();
              }
          }, 1, TimeUnit.SECONDS);
  
          assertFalse(it.hasNext());
      }
  
      @Test(expected = TestException.class)
      public void errorAfterDispose() {
          Iterator<Object> it = Observable.error(new TestException()).blockingIterable().iterator();
  
          ((Disposable)it).dispose();
  
          it.hasNext();
      }
  }
  