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 static org.mockito.ArgumentMatchers.any;
  import static org.mockito.Mockito.*;
  
  import java.util.ArrayList;
  import java.util.concurrent.atomic.*;
  
  import org.junit.Test;
  
  import io.reactivex.rxjava3.core.*;
  import io.reactivex.rxjava3.functions.Consumer;
  import io.reactivex.rxjava3.observers.*;
  import io.reactivex.rxjava3.operators.QueueFuseable;
  import io.reactivex.rxjava3.testsupport.*;
  
  public class ObservableRangeLongTest extends RxJavaTest {
      @Test
      public void rangeStartAt2Count3() {
          Observer<Long> observer = TestHelper.mockObserver();
  
          Observable.rangeLong(2, 3).subscribe(observer);
  
          verify(observer, times(1)).onNext(2L);
          verify(observer, times(1)).onNext(3L);
          verify(observer, times(1)).onNext(4L);
          verify(observer, never()).onNext(5L);
          verify(observer, never()).onError(any(Throwable.class));
          verify(observer, times(1)).onComplete();
      }
  
      @Test
      public void rangeUnsubscribe() {
          Observer<Long> observer = TestHelper.mockObserver();
  
          final AtomicInteger count = new AtomicInteger();
  
          Observable.rangeLong(1, 1000).doOnNext(new Consumer<Long>() {
              @Override
              public void accept(Long t1) {
                  count.incrementAndGet();
              }
          })
          .take(3).subscribe(observer);
  
          verify(observer, times(1)).onNext(1L);
          verify(observer, times(1)).onNext(2L);
          verify(observer, times(1)).onNext(3L);
          verify(observer, never()).onNext(4L);
          verify(observer, never()).onError(any(Throwable.class));
          verify(observer, times(1)).onComplete();
          assertEquals(3, count.get());
      }
  
      @Test
      public void rangeWithZero() {
          Observable.rangeLong(1L, 0L);
      }
  
      @Test
      public void rangeWithOverflow2() {
          Observable.rangeLong(Long.MAX_VALUE, 0L);
      }
  
      @Test
      public void rangeWithOverflow3() {
          Observable.rangeLong(1L, Long.MAX_VALUE);
      }
  
      @Test(expected = IllegalArgumentException.class)
      public void rangeWithOverflow4() {
          Observable.rangeLong(2L, Long.MAX_VALUE);
      }
  
      @Test
      public void rangeWithOverflow5() {
          assertFalse(Observable.rangeLong(Long.MIN_VALUE, 0).blockingIterable().iterator().hasNext());
      }
  
      @Test
      public void noBackpressure() {
          ArrayList<Long> list = new ArrayList<>(Flowable.bufferSize() * 2);
          for (long i = 1; i <= Flowable.bufferSize() * 2 + 1; i++) {
              list.add(i);
          }
  
          Observable<Long> o = Observable.rangeLong(1, list.size());
  
          TestObserverEx<Long> to = new TestObserverEx<>();
  
          o.subscribe(to);
  
          to.assertValueSequence(list);
          to.assertTerminated();
      }
  
      @Test
      public void emptyRangeSendsOnCompleteEagerlyWithRequestZero() {
          final AtomicBoolean completed = new AtomicBoolean(false);
          Observable.rangeLong(1L, 0L).subscribe(new DefaultObserver<Long>() {
  
              @Override
              public void onStart() {
  //                request(0);
              }
  
              @Override
              public void onComplete() {
                  completed.set(true);
              }
  
              @Override
              public void onError(Throwable e) {
  
              }
  
              @Override
              public void onNext(Long t) {
  
              }});
          assertTrue(completed.get());
      }
  
      @Test
      public void nearMaxValueWithoutBackpressure() {
          TestObserver<Long> to = new TestObserver<>();
          Observable.rangeLong(Long.MAX_VALUE - 1L, 2L).subscribe(to);
  
          to.assertComplete();
          to.assertNoErrors();
          to.assertValues(Long.MAX_VALUE - 1, Long.MAX_VALUE);
      }
  
      @Test
      public void negativeCount() {
          try {
              Observable.rangeLong(1L, -1L);
              fail("Should have thrown IllegalArgumentException");
          } catch (IllegalArgumentException ex) {
              assertEquals("count >= 0 required but it was -1", ex.getMessage());
          }
      }
  
      @Test
      public void countOne() {
          Observable.rangeLong(5495454L, 1L)
              .test()
              .assertResult(5495454L);
      }
  
      @Test
      public void noOverflow() {
          Observable.rangeLong(Long.MAX_VALUE - 1, 2);
          Observable.rangeLong(Long.MIN_VALUE, 2);
          Observable.rangeLong(Long.MIN_VALUE, Long.MAX_VALUE);
      }
  
      @Test
      public void fused() {
          TestObserverEx<Long> to = new TestObserverEx<>(QueueFuseable.ANY);
  
          Observable.rangeLong(1, 2).subscribe(to);
  
          to.assertFusionMode(QueueFuseable.SYNC)
          .assertResult(1L, 2L);
      }
  
      @Test
      public void fusedReject() {
          TestObserverEx<Long> to = new TestObserverEx<>(QueueFuseable.ASYNC);
  
          Observable.rangeLong(1, 2).subscribe(to);
  
          to.assertFusionMode(QueueFuseable.NONE)
          .assertResult(1L, 2L);
      }
  
      @Test
      public void disposed() {
          TestHelper.checkDisposed(Observable.rangeLong(1, 2));
      }
  
      @Test
      public void fusedClearIsEmpty() {
          TestHelper.checkFusedIsEmptyClear(Observable.rangeLong(1, 2));
      }
  }
  