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 io.reactivex.rxjava3.disposables.Disposable;
  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.observers.TestObserver;
  import io.reactivex.rxjava3.plugins.RxJavaPlugins;
  import io.reactivex.rxjava3.subjects.*;
  import io.reactivex.rxjava3.testsupport.TestHelper;
  
  public class ObservableSwitchMapCompletableTest extends RxJavaTest {
  
      @Test
      public void normal() {
          Observable.range(1, 10)
          .switchMapCompletable(new Function<Integer, CompletableSource>() {
              @Override
              public CompletableSource apply(Integer v) throws Exception {
                  return Completable.complete();
              }
          })
          .test()
          .assertResult();
      }
  
      @Test
      public void mainError() {
          Observable.<Integer>error(new TestException())
          .switchMapCompletable(new Function<Integer, CompletableSource>() {
              @Override
              public CompletableSource apply(Integer v) throws Exception {
                  return Completable.complete();
              }
          })
          .test()
          .assertFailure(TestException.class);
      }
  
      @Test
      public void innerError() {
          PublishSubject<Integer> ps = PublishSubject.create();
          CompletableSubject cs = CompletableSubject.create();
  
          TestObserver<Void> to = ps.switchMapCompletable(Functions.justFunction(cs))
          .test();
  
          assertTrue(ps.hasObservers());
          assertFalse(cs.hasObservers());
  
          ps.onNext(1);
  
          assertTrue(cs.hasObservers());
  
          to.assertEmpty();
  
          cs.onError(new TestException());
  
          to.assertFailure(TestException.class);
  
          assertFalse(ps.hasObservers());
          assertFalse(cs.hasObservers());
      }
  
      @Test
      public void switchOver() {
          final CompletableSubject[] css = {
                  CompletableSubject.create(),
                  CompletableSubject.create()
          };
  
          PublishSubject<Integer> ps = PublishSubject.create();
  
          TestObserver<Void> to = ps.switchMapCompletable(new Function<Integer, CompletableSource>() {
              @Override
              public CompletableSource apply(Integer v) throws Exception {
                  return css[v];
              }
          })
          .test();
  
          to.assertEmpty();
  
          ps.onNext(0);
  
          assertTrue(css[0].hasObservers());
  
          ps.onNext(1);
  
          assertFalse(css[0].hasObservers());
          assertTrue(css[1].hasObservers());
  
          ps.onComplete();
  
          to.assertEmpty();
  
          assertTrue(css[1].hasObservers());
  
          css[1].onComplete();
  
          to.assertResult();
      }
  
      @Test
      public void dispose() {
          PublishSubject<Integer> ps = PublishSubject.create();
          CompletableSubject cs = CompletableSubject.create();
  
          TestObserver<Void> to = ps.switchMapCompletable(Functions.justFunction(cs))
          .test();
  
          ps.onNext(1);
  
          assertTrue(ps.hasObservers());
          assertTrue(cs.hasObservers());
  
          to.dispose();
  
          assertFalse(ps.hasObservers());
          assertFalse(cs.hasObservers());
      }
  
      @Test
      public void checkDisposed() {
          PublishSubject<Integer> ps = PublishSubject.create();
          CompletableSubject cs = CompletableSubject.create();
  
          TestHelper.checkDisposed(ps.switchMapCompletable(Functions.justFunction(cs)));
      }
  
      @Test
      public void checkBadSource() {
          TestHelper.checkDoubleOnSubscribeObservableToCompletable(new Function<Observable<Object>, Completable>() {
              @Override
              public Completable apply(Observable<Object> f) throws Exception {
                  return f.switchMapCompletable(Functions.justFunction(Completable.never()));
              }
          });
      }
  
      @Test
      public void mapperCrash() {
          Observable.range(1, 5).switchMapCompletable(new Function<Integer, CompletableSource>() {
              @Override
              public CompletableSource apply(Integer f) throws Exception {
                  throw new TestException();
              }
          })
          .test()
          .assertFailure(TestException.class);
      }
  
      @Test
      public void mapperCancels() {
          final TestObserver<Void> to = new TestObserver<>();
  
          Observable.range(1, 5).switchMapCompletable(new Function<Integer, CompletableSource>() {
              @Override
              public CompletableSource apply(Integer f) throws Exception {
                  to.dispose();
                  return Completable.complete();
              }
          })
          .subscribe(to);
  
          to.assertEmpty();
      }
  
      @Test
      public void onNextInnerCompleteRace() {
          for (int i = 0; i < TestHelper.RACE_LONG_LOOPS; i++) {
              final PublishSubject<Integer> ps = PublishSubject.create();
              final CompletableSubject cs = CompletableSubject.create();
  
              TestObserver<Void> to = ps.switchMapCompletable(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();
                  }
              };
  
              TestHelper.race(r1, r2);
  
              to.assertEmpty();
          }
      }
  
      @Test
      public void onNextInnerErrorRace() {
          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.switchMapCompletable(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.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;
                      }
                  });
  
                  if (!errors.isEmpty()) {
                      TestHelper.assertUndeliverable(errors, 0, TestException.class);
                  }
              } finally {
                  RxJavaPlugins.reset();
              }
          }
      }
  
      @Test
      public void onErrorInnerErrorRace() {
          final TestException ex0 = new TestException();
          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.switchMapCompletable(Functions.justFunction(cs)).test();
  
                  ps.onNext(1);
  
                  Runnable r1 = new Runnable() {
                      @Override
                      public void run() {
                          ps.onError(ex0);
                      }
                  };
  
                  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;
                      }
                  });
  
                  if (!errors.isEmpty()) {
                      TestHelper.assertUndeliverable(errors, 0, TestException.class);
                  }
              } finally {
                  RxJavaPlugins.reset();
              }
          }
      }
  
      @Test
      public void innerErrorThenMainError() {
          List<Throwable> errors = TestHelper.trackPluginErrors();
          try {
              new Observable<Integer>() {
                  @Override
                  protected void subscribeActual(Observer<? super Integer> observer) {
                      observer.onSubscribe(Disposable.empty());
                      observer.onNext(1);
                      observer.onError(new TestException("main"));
                  }
              }
              .switchMapCompletable(Functions.justFunction(Completable.error(new TestException("inner"))))
              .to(TestHelper.testConsumer())
              .assertFailureAndMessage(TestException.class, "inner");
  
              TestHelper.assertUndeliverable(errors, 0, TestException.class, "main");
          } finally {
              RxJavaPlugins.reset();
          }
      }
  
      @Test
      public void innerErrorDelayed() {
          final PublishSubject<Integer> ps = PublishSubject.create();
          final CompletableSubject cs = CompletableSubject.create();
  
          TestObserver<Void> to = ps.switchMapCompletableDelayError(Functions.justFunction(cs)).test();
  
          ps.onNext(1);
  
          cs.onError(new TestException());
  
          to.assertEmpty();
  
          assertTrue(ps.hasObservers());
  
          ps.onComplete();
  
          to.assertFailure(TestException.class);
      }
  
      @Test
      public void mainCompletesinnerErrorDelayed() {
          final PublishSubject<Integer> ps = PublishSubject.create();
          final CompletableSubject cs = CompletableSubject.create();
  
          TestObserver<Void> to = ps.switchMapCompletableDelayError(Functions.justFunction(cs)).test();
  
          ps.onNext(1);
          ps.onComplete();
  
          to.assertEmpty();
  
          cs.onError(new TestException());
  
          to.assertFailure(TestException.class);
      }
  
      @Test
      public void mainErrorDelayed() {
          final PublishSubject<Integer> ps = PublishSubject.create();
          final CompletableSubject cs = CompletableSubject.create();
  
          TestObserver<Void> to = ps.switchMapCompletableDelayError(Functions.justFunction(cs)).test();
  
          ps.onNext(1);
  
          ps.onError(new TestException());
  
          to.assertEmpty();
  
          assertTrue(cs.hasObservers());
  
          cs.onComplete();
  
          to.assertFailure(TestException.class);
      }
  
      @Test
      public void scalarMapperCrash() {
          TestObserver<Void> to = Observable.just(1)
          .switchMapCompletable(new Function<Integer, CompletableSource>() {
              @Override
              public CompletableSource apply(Integer v)
                      throws Exception {
                          throw new TestException();
                      }
          })
          .test();
  
          to.assertFailure(TestException.class);
      }
  
      @Test
      public void scalarEmptySource() {
          CompletableSubject cs = CompletableSubject.create();
  
          Observable.empty()
          .switchMapCompletable(Functions.justFunction(cs))
          .test()
          .assertResult();
  
          assertFalse(cs.hasObservers());
      }
  
      @Test
      public void scalarSource() {
          CompletableSubject cs = CompletableSubject.create();
  
          TestObserver<Void> to = Observable.just(1)
          .switchMapCompletable(Functions.justFunction(cs))
          .test();
  
          assertTrue(cs.hasObservers());
  
          to.assertEmpty();
  
          cs.onComplete();
  
          to.assertResult();
      }
  
      @Test
      public void undeliverableUponCancel() {
          TestHelper.checkUndeliverableUponCancel(new ObservableConverter<Integer, Completable>() {
              @Override
              public Completable apply(Observable<Integer> upstream) {
                  return upstream.switchMapCompletable(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.switchMapCompletableDelayError(new Function<Integer, Completable>() {
                      @Override
                      public Completable apply(Integer v) throws Throwable {
                          return Completable.complete().hide();
                      }
                  });
              }
          });
      }
  }
  