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.mixed;
  
  import static org.junit.Assert.*;
  
  import java.util.List;
  import java.util.concurrent.atomic.AtomicInteger;
  
  import org.junit.Test;
  
  import io.reactivex.rxjava3.core.*;
  import io.reactivex.rxjava3.exceptions.*;
  import io.reactivex.rxjava3.functions.*;
  import io.reactivex.rxjava3.internal.functions.Functions;
  import io.reactivex.rxjava3.internal.schedulers.ImmediateThinScheduler;
  import io.reactivex.rxjava3.observers.TestObserver;
  import io.reactivex.rxjava3.plugins.RxJavaPlugins;
  import io.reactivex.rxjava3.subjects.*;
  import io.reactivex.rxjava3.testsupport.*;
  
  public class ObservableConcatMapCompletableTest extends RxJavaTest {
  
      @Test
      public void simple() {
          Observable.range(1, 5)
          .concatMapCompletable(Functions.justFunction(Completable.complete()))
          .test()
          .assertResult();
      }
  
      @Test
      public void simple2() {
          final AtomicInteger counter = new AtomicInteger();
          Observable.range(1, 5)
          .concatMapCompletable(Functions.justFunction(Completable.fromAction(new Action() {
              @Override
              public void run() throws Exception {
                  counter.incrementAndGet();
              }
          })))
          .test()
          .assertResult();
  
          assertEquals(5, counter.get());
      }
  
      @Test
      public void simpleLongPrefetch() {
          Observable.range(1, 1024)
          .concatMapCompletable(Functions.justFunction(Completable.complete()), 32)
          .test()
          .assertResult();
      }
  
      @Test
      public void mainError() {
          Observable.<Integer>error(new TestException())
          .concatMapCompletable(Functions.justFunction(Completable.complete()))
          .test()
          .assertFailure(TestException.class);
      }
  
      @Test
      public void innerError() {
          Observable.just(1)
          .concatMapCompletable(Functions.justFunction(Completable.error(new TestException())))
          .test()
          .assertFailure(TestException.class);
      }
  
      @Test
      public void innerErrorDelayed() {
          TestObserverEx<Void> to = Observable.range(1, 5)
          .concatMapCompletableDelayError(
                  new Function<Integer, CompletableSource>() {
                      @Override
                      public CompletableSource apply(Integer v) throws Exception {
                          return Completable.error(new TestException());
                      }
                  }
          )
          .to(TestHelper.<Void>testConsumer())
          .assertFailure(CompositeException.class)
          ;
  
          assertEquals(5, ((CompositeException)to.errors().get(0)).getExceptions().size());
      }
  
      @Test
      public void mapperCrash() {
          Observable.just(1)
          .concatMapCompletable(new Function<Integer, CompletableSource>() {
              @Override
              public CompletableSource apply(Integer v) throws Exception {
                  throw new TestException();
              }
          })
          .test()
          .assertFailure(TestException.class);
      }
  
      @Test
      public void mapperCrashHidden() {
          Observable.just(1).hide()
          .concatMapCompletable(new Function<Integer, CompletableSource>() {
              @Override
              public CompletableSource apply(Integer v) throws Exception {
                  throw new TestException();
              }
          })
          .test()
          .assertFailure(TestException.class);
      }
  
      @Test
      public void immediateError() {
          PublishSubject<Integer> ps = PublishSubject.create();
          CompletableSubject cs = CompletableSubject.create();
  
          TestObserver<Void> to = ps.concatMapCompletable(
                  Functions.justFunction(cs)).test();
  
          to.assertEmpty();
  
          assertTrue(ps.hasObservers());
          assertFalse(cs.hasObservers());
  
          ps.onNext(1);
  
          assertTrue(cs.hasObservers());
  
          ps.onError(new TestException());
  
          assertFalse(cs.hasObservers());
  
          to.assertFailure(TestException.class);
      }
  
      @Test
      public void immediateError2() {
          PublishSubject<Integer> ps = PublishSubject.create();
          CompletableSubject cs = CompletableSubject.create();
  
          TestObserver<Void> to = ps.concatMapCompletable(
                  Functions.justFunction(cs)).test();
  
          to.assertEmpty();
  
          assertTrue(ps.hasObservers());
          assertFalse(cs.hasObservers());
  
          ps.onNext(1);
  
          assertTrue(cs.hasObservers());
  
          cs.onError(new TestException());
  
          assertFalse(ps.hasObservers());
  
          to.assertFailure(TestException.class);
      }
  
      @Test
      public void boundaryError() {
          PublishSubject<Integer> ps = PublishSubject.create();
          CompletableSubject cs = CompletableSubject.create();
  
          TestObserver<Void> to = ps.concatMapCompletableDelayError(
                  Functions.justFunction(cs), false).test();
  
          to.assertEmpty();
  
          assertTrue(ps.hasObservers());
          assertFalse(cs.hasObservers());
  
          ps.onNext(1);
  
          assertTrue(cs.hasObservers());
  
          ps.onError(new TestException());
  
          assertTrue(cs.hasObservers());
  
          to.assertEmpty();
  
          cs.onComplete();
  
          to.assertFailure(TestException.class);
      }
  
      @Test
      public void endError() {
          PublishSubject<Integer> ps = PublishSubject.create();
          final CompletableSubject cs = CompletableSubject.create();
          final CompletableSubject cs2 = CompletableSubject.create();
  
          TestObserver<Void> to = ps.concatMapCompletableDelayError(
                  new Function<Integer, CompletableSource>() {
                      @Override
                      public CompletableSource apply(Integer v) throws Exception {
                          if (v == 1) {
                              return cs;
                          }
                          return cs2;
                      }
                  }, true, 32
          )
          .test();
  
          to.assertEmpty();
  
          assertTrue(ps.hasObservers());
          assertFalse(cs.hasObservers());
  
          ps.onNext(1);
  
          assertTrue(cs.hasObservers());
  
          cs.onError(new TestException());
  
          assertTrue(ps.hasObservers());
  
          ps.onNext(2);
  
          to.assertEmpty();
  
          cs2.onComplete();
  
          assertTrue(ps.hasObservers());
  
          to.assertEmpty();
  
          ps.onComplete();
  
          to.assertFailure(TestException.class);
      }
  
      @Test
      public void doubleOnSubscribe() {
          TestHelper.checkDoubleOnSubscribeObservableToCompletable(
                  new Function<Observable<Object>, Completable>() {
                      @Override
                      public Completable apply(Observable<Object> f)
                              throws Exception {
                          return f.concatMapCompletable(
                                  Functions.justFunction(Completable.complete()));
                      }
                  }
          );
      }
  
      @Test
      public void disposed() {
          TestHelper.checkDisposed(
                  Observable.never()
                  .concatMapCompletable(
                          Functions.justFunction(Completable.complete()))
          );
      }
  
      @Test
      public void immediateOuterInnerErrorRace() {
          final TestException ex = new TestException();
          for (int i = 0; i < TestHelper.RACE_LONG_LOOPS; i++) {
              List<Throwable> errors = TestHelper.trackPluginErrors();
              try {
                  final PublishSubject<Integer> ps = PublishSubject.create();
                  final CompletableSubject cs = CompletableSubject.create();
  
                  TestObserver<Void> to = ps.concatMapCompletable(
                          Functions.justFunction(cs)
                  )
                  .test();
  
                  ps.onNext(1);
  
                  Runnable r1 = new Runnable() {
                      @Override
                      public void run() {
                          ps.onError(ex);
                      }
                  };
  
                  Runnable r2 = new Runnable() {
                      @Override
                      public void run() {
                          cs.onError(ex);
                      }
                  };
  
                  TestHelper.race(r1, r2);
  
                  to.assertError(new Predicate<Throwable>() {
                      @Override
                      public boolean test(Throwable e) throws Exception {
                          return e instanceof TestException || e instanceof CompositeException;
                      }
                  })
                  .assertNotComplete();
  
                  if (!errors.isEmpty()) {
                      TestHelper.assertUndeliverable(errors, 0, TestException.class);
                  }
              } finally {
                  RxJavaPlugins.reset();
              }
          }
      }
  
      @Test
      public void disposeInDrainLoop() {
          for (int i = 0; i < TestHelper.RACE_LONG_LOOPS; i++) {
              final PublishSubject<Integer> ps = PublishSubject.create();
              final CompletableSubject cs = CompletableSubject.create();
  
              final TestObserver<Void> to = ps.concatMapCompletable(
                      Functions.justFunction(cs)
              )
              .test();
  
              ps.onNext(1);
  
              Runnable r1 = new Runnable() {
                  @Override
                  public void run() {
                      ps.onNext(2);
                  }
              };
  
              Runnable r2 = new Runnable() {
                  @Override
                  public void run() {
                      cs.onComplete();
                      to.dispose();
                  }
              };
  
              TestHelper.race(r1, r2);
  
              to.assertEmpty();
          }
      }
  
      @Test
      public void doneButNotEmpty() {
          final PublishSubject<Integer> ps = PublishSubject.create();
          final CompletableSubject cs = CompletableSubject.create();
  
          final TestObserver<Void> to = ps.concatMapCompletable(
                  Functions.justFunction(cs)
          )
          .test();
  
          ps.onNext(1);
          ps.onNext(2);
          ps.onComplete();
  
          cs.onComplete();
  
          to.assertResult();
      }
  
      @Test
      public void asyncFused() {
          final PublishSubject<Integer> ps = PublishSubject.create();
          final CompletableSubject cs = CompletableSubject.create();
  
          final TestObserver<Void> to = ps.observeOn(ImmediateThinScheduler.INSTANCE)
          .concatMapCompletable(
                  Functions.justFunction(cs)
          )
          .test();
  
          ps.onNext(1);
          ps.onComplete();
  
          cs.onComplete();
  
          to.assertResult();
      }
  
      @Test
      public void fusionRejected() {
          final CompletableSubject cs = CompletableSubject.create();
  
          TestHelper.rejectObservableFusion()
          .concatMapCompletable(
                  Functions.justFunction(cs)
          )
          .test()
          .assertEmpty();
      }
  
      @Test
      public void emptyScalarSource() {
          final CompletableSubject cs = CompletableSubject.create();
  
          Observable.empty()
          .concatMapCompletable(Functions.justFunction(cs))
          .test()
          .assertResult();
      }
  
      @Test
      public void justScalarSource() {
          final CompletableSubject cs = CompletableSubject.create();
  
          TestObserver<Void> to = Observable.just(1)
          .concatMapCompletable(Functions.justFunction(cs))
          .test();
  
          to.assertEmpty();
  
          assertTrue(cs.hasObservers());
  
          cs.onComplete();
  
          to.assertResult();
      }
  
      @Test
      public void undeliverableUponCancel() {
          TestHelper.checkUndeliverableUponCancel(new ObservableConverter<Integer, Completable>() {
              @Override
              public Completable apply(Observable<Integer> upstream) {
                  return upstream.concatMapCompletable(new Function<Integer, Completable>() {
                      @Override
                      public Completable apply(Integer v) throws Throwable {
                          return Completable.complete().hide();
                      }
                  });
              }
          });
      }
  
      @Test
      public void undeliverableUponCancelDelayError() {
          TestHelper.checkUndeliverableUponCancel(new ObservableConverter<Integer, Completable>() {
              @Override
              public Completable apply(Observable<Integer> upstream) {
                  return upstream.concatMapCompletableDelayError(new Function<Integer, Completable>() {
                      @Override
                      public Completable apply(Integer v) throws Throwable {
                          return Completable.complete().hide();
                      }
                  }, false, 2);
              }
          });
      }
  
      @Test
      public void undeliverableUponCancelDelayErrorTillEnd() {
          TestHelper.checkUndeliverableUponCancel(new ObservableConverter<Integer, Completable>() {
              @Override
              public Completable apply(Observable<Integer> upstream) {
                  return upstream.concatMapCompletableDelayError(new Function<Integer, Completable>() {
                      @Override
                      public Completable apply(Integer v) throws Throwable {
                          return Completable.complete().hide();
                      }
                  }, true, 2);
              }
          });
      }
  
      @Test
      public void basicNonFused() {
          Observable.range(1, 5).hide()
          .concatMapCompletable(v -> Completable.complete().hide())
          .test()
          .assertResult();
      }
  
      @Test
      public void basicSyncFused() {
          Observable.range(1, 5)
          .concatMapCompletable(v -> Completable.complete().hide())
          .test()
          .assertResult();
      }
  
      @Test
      public void basicAsyncFused() {
          UnicastSubject<Integer> us = UnicastSubject.create();
          TestHelper.emit(us, 1, 2, 3, 4, 5);
  
          us
          .concatMapCompletable(v -> Completable.complete().hide())
          .test()
          .assertResult();
      }
  
      @Test
      public void basicFusionRejected() {
          TestHelper.<Integer>rejectObservableFusion()
          .concatMapCompletable(v -> Completable.complete().hide())
          .test()
          .assertEmpty();
      }
  
      @Test
      public void fusedPollCrash() {
          Observable.range(1, 5)
          .map(v -> {
              if (v == 3) {
                  throw new TestException();
              }
              return v;
          })
          .compose(TestHelper.observableStripBoundary())
          .concatMapCompletable(v -> Completable.complete().hide())
          .test()
          .assertFailure(TestException.class);
      }
  }
  