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.concurrent.atomic.*;
  
  import org.junit.Test;
  
  import io.reactivex.rxjava3.core.*;
  import io.reactivex.rxjava3.exceptions.TestException;
  import io.reactivex.rxjava3.functions.*;
  import io.reactivex.rxjava3.observers.TestObserver;
  import io.reactivex.rxjava3.subjects.PublishSubject;
  import io.reactivex.rxjava3.testsupport.*;
  
  public class ObservableIgnoreElementsTest extends RxJavaTest {
  
      @Test
      public void withEmptyObservable() {
          assertTrue(Observable.empty().ignoreElements().toObservable().isEmpty().blockingGet());
      }
  
      @Test
      public void withNonEmptyObservable() {
          assertTrue(Observable.just(1, 2, 3).ignoreElements().toObservable().isEmpty().blockingGet());
      }
  
      @Test
      public void upstreamIsProcessedButIgnoredObservable() {
          final int num = 10;
          final AtomicInteger upstreamCount = new AtomicInteger();
          long count = Observable.range(1, num)
                  .doOnNext(new Consumer<Integer>() {
                      @Override
                      public void accept(Integer t) {
                          upstreamCount.incrementAndGet();
                      }
                  })
                  .ignoreElements()
                  .toObservable()
                  .count().blockingGet();
          assertEquals(num, upstreamCount.get());
          assertEquals(0, count);
      }
  
      @Test
      public void completedOkObservable() {
          TestObserverEx<Object> to = new TestObserverEx<>();
          Observable.range(1, 10).ignoreElements().toObservable().subscribe(to);
          to.assertNoErrors();
          to.assertNoValues();
          to.assertTerminated();
      }
  
      @Test
      public void errorReceivedObservable() {
          TestObserverEx<Object> to = new TestObserverEx<>();
          TestException ex = new TestException("boo");
          Observable.error(ex).ignoreElements().toObservable().subscribe(to);
          to.assertNoValues();
          to.assertTerminated();
          to.assertError(TestException.class);
          to.assertErrorMessage("boo");
      }
  
      @Test
      public void unsubscribesFromUpstreamObservable() {
          final AtomicBoolean unsub = new AtomicBoolean();
          Observable.range(1, 10).concatWith(Observable.<Integer>never())
          .doOnDispose(new Action() {
              @Override
              public void run() {
                  unsub.set(true);
              }})
              .ignoreElements()
              .toObservable()
              .subscribe()
              .dispose();
          assertTrue(unsub.get());
      }
  
      @Test
      public void withEmpty() {
          Observable.empty().ignoreElements().blockingAwait();
      }
  
      @Test
      public void withNonEmpty() {
          Observable.just(1, 2, 3).ignoreElements().blockingAwait();
      }
  
      @Test
      public void upstreamIsProcessedButIgnored() {
          final int num = 10;
          final AtomicInteger upstreamCount = new AtomicInteger();
          Observable.range(1, num)
                  .doOnNext(new Consumer<Integer>() {
                      @Override
                      public void accept(Integer t) {
                          upstreamCount.incrementAndGet();
                      }
                  })
                  .ignoreElements()
                  .blockingAwait();
          assertEquals(num, upstreamCount.get());
      }
  
      @Test
      public void completedOk() {
          TestObserverEx<Object> to = new TestObserverEx<>();
          Observable.range(1, 10).ignoreElements().subscribe(to);
          to.assertNoErrors();
          to.assertNoValues();
          to.assertTerminated();
      }
  
      @Test
      public void errorReceived() {
          TestObserverEx<Object> to = new TestObserverEx<>();
          TestException ex = new TestException("boo");
          Observable.error(ex).ignoreElements().subscribe(to);
          to.assertNoValues();
          to.assertTerminated();
          to.assertError(TestException.class);
          to.assertErrorMessage("boo");
      }
  
      @Test
      public void unsubscribesFromUpstream() {
          final AtomicBoolean unsub = new AtomicBoolean();
          Observable.range(1, 10).concatWith(Observable.<Integer>never())
          .doOnDispose(new Action() {
              @Override
              public void run() {
                  unsub.set(true);
              }})
              .ignoreElements()
              .subscribe()
              .dispose();
          assertTrue(unsub.get());
      }
  
      @Test
      public void dispose() {
  
          PublishSubject<Integer> ps = PublishSubject.create();
  
          TestObserver<Integer> to = ps.ignoreElements().<Integer>toObservable().test();
  
          assertTrue(ps.hasObservers());
  
          to.dispose();
  
          assertFalse(ps.hasObservers());
  
          TestHelper.checkDisposed(ps.ignoreElements().<Integer>toObservable());
      }
  
      @Test
      public void checkDispose() {
          TestHelper.checkDisposed(Observable.just(1).ignoreElements());
  
          TestHelper.checkDisposed(Observable.just(1).ignoreElements().toObservable());
      }
  }
  