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.mockito.ArgumentMatchers.isA;
  import static org.mockito.Mockito.*;
  
  import org.junit.Test;
  import org.mockito.InOrder;
  
  import io.reactivex.rxjava3.core.*;
  import io.reactivex.rxjava3.exceptions.TestException;
  import io.reactivex.rxjava3.functions.BiPredicate;
  import io.reactivex.rxjava3.observers.TestObserver;
  import io.reactivex.rxjava3.subjects.PublishSubject;
  import io.reactivex.rxjava3.testsupport.TestHelper;
  
  public class ObservableSequenceEqualTest extends RxJavaTest {
  
      @Test
      public void observable1() {
          Observable<Boolean> o = Observable.sequenceEqual(
                  Observable.just("one", "two", "three"),
                  Observable.just("one", "two", "three")).toObservable();
          verifyResult(o, true);
      }
  
      @Test
      public void observable2() {
          Observable<Boolean> o = Observable.sequenceEqual(
                  Observable.just("one", "two", "three"),
                  Observable.just("one", "two", "three", "four")).toObservable();
          verifyResult(o, false);
      }
  
      @Test
      public void observable3() {
          Observable<Boolean> o = Observable.sequenceEqual(
                  Observable.just("one", "two", "three", "four"),
                  Observable.just("one", "two", "three")).toObservable();
          verifyResult(o, false);
      }
  
      @Test
      public void withError1Observable() {
          Observable<Boolean> o = Observable.sequenceEqual(
                  Observable.concat(Observable.just("one"),
                          Observable.<String> error(new TestException())),
                  Observable.just("one", "two", "three")).toObservable();
          verifyError(o);
      }
  
      @Test
      public void withError2Observable() {
          Observable<Boolean> o = Observable.sequenceEqual(
                  Observable.just("one", "two", "three"),
                  Observable.concat(Observable.just("one"),
                          Observable.<String> error(new TestException()))).toObservable();
          verifyError(o);
      }
  
      @Test
      public void withError3Observable() {
          Observable<Boolean> o = Observable.sequenceEqual(
                  Observable.concat(Observable.just("one"),
                          Observable.<String> error(new TestException())),
                  Observable.concat(Observable.just("one"),
                          Observable.<String> error(new TestException()))).toObservable();
          verifyError(o);
      }
  
      @Test
      public void withEmpty1Observable() {
          Observable<Boolean> o = Observable.sequenceEqual(
                  Observable.<String> empty(),
                  Observable.just("one", "two", "three")).toObservable();
          verifyResult(o, false);
      }
  
      @Test
      public void withEmpty2Observable() {
          Observable<Boolean> o = Observable.sequenceEqual(
                  Observable.just("one", "two", "three"),
                  Observable.<String> empty()).toObservable();
          verifyResult(o, false);
      }
  
      @Test
      public void withEmpty3Observable() {
          Observable<Boolean> o = Observable.sequenceEqual(
                  Observable.<String> empty(), Observable.<String> empty()).toObservable();
          verifyResult(o, true);
      }
  
      @Test
      public void withEqualityErrorObservable() {
          Observable<Boolean> o = Observable.sequenceEqual(
                  Observable.just("one"), Observable.just("one"),
                  new BiPredicate<String, String>() {
                      @Override
                      public boolean test(String t1, String t2) {
                          throw new TestException();
                      }
                  }).toObservable();
          verifyError(o);
      }
  
      private void verifyResult(Single<Boolean> o, boolean result) {
          SingleObserver<Boolean> observer = TestHelper.mockSingleObserver();
  
          o.subscribe(observer);
  
          InOrder inOrder = inOrder(observer);
          inOrder.verify(observer, times(1)).onSuccess(result);
          inOrder.verifyNoMoreInteractions();
      }
  
      private void verifyError(Observable<Boolean> observable) {
          Observer<Boolean> observer = TestHelper.mockObserver();
          observable.subscribe(observer);
  
          InOrder inOrder = inOrder(observer);
          inOrder.verify(observer, times(1)).onError(isA(TestException.class));
          inOrder.verifyNoMoreInteractions();
      }
  
      private void verifyError(Single<Boolean> single) {
          SingleObserver<Boolean> observer = TestHelper.mockSingleObserver();
          single.subscribe(observer);
  
          InOrder inOrder = inOrder(observer);
          inOrder.verify(observer, times(1)).onError(isA(TestException.class));
          inOrder.verifyNoMoreInteractions();
      }
  
      @Test
      public void prefetchObservable() {
          Observable.sequenceEqual(Observable.range(1, 20), Observable.range(1, 20), 2)
          .toObservable()
          .test()
          .assertResult(true);
      }
  
      @Test
      public void disposedObservable() {
          TestHelper.checkDisposed(Observable.sequenceEqual(Observable.just(1), Observable.just(2)).toObservable());
      }
  
      @Test
      public void one() {
          Single<Boolean> o = Observable.sequenceEqual(
                  Observable.just("one", "two", "three"),
                  Observable.just("one", "two", "three"));
          verifyResult(o, true);
      }
  
      @Test
      public void two() {
          Single<Boolean> o = Observable.sequenceEqual(
                  Observable.just("one", "two", "three"),
                  Observable.just("one", "two", "three", "four"));
          verifyResult(o, false);
      }
  
      @Test
      public void three() {
          Single<Boolean> o = Observable.sequenceEqual(
                  Observable.just("one", "two", "three", "four"),
                  Observable.just("one", "two", "three"));
          verifyResult(o, false);
      }
  
      @Test
      public void withError1() {
          Single<Boolean> o = Observable.sequenceEqual(
                  Observable.concat(Observable.just("one"),
                          Observable.<String> error(new TestException())),
                  Observable.just("one", "two", "three"));
          verifyError(o);
      }
  
      @Test
      public void withError2() {
          Single<Boolean> o = Observable.sequenceEqual(
                  Observable.just("one", "two", "three"),
                  Observable.concat(Observable.just("one"),
                          Observable.<String> error(new TestException())));
          verifyError(o);
      }
  
      @Test
      public void withError3() {
          Single<Boolean> o = Observable.sequenceEqual(
                  Observable.concat(Observable.just("one"),
                          Observable.<String> error(new TestException())),
                  Observable.concat(Observable.just("one"),
                          Observable.<String> error(new TestException())));
          verifyError(o);
      }
  
      @Test
      public void withEmpty1() {
          Single<Boolean> o = Observable.sequenceEqual(
                  Observable.<String> empty(),
                  Observable.just("one", "two", "three"));
          verifyResult(o, false);
      }
  
      @Test
      public void withEmpty2() {
          Single<Boolean> o = Observable.sequenceEqual(
                  Observable.just("one", "two", "three"),
                  Observable.<String> empty());
          verifyResult(o, false);
      }
  
      @Test
      public void withEmpty3() {
          Single<Boolean> o = Observable.sequenceEqual(
                  Observable.<String> empty(), Observable.<String> empty());
          verifyResult(o, true);
      }
  
      @Test
      public void withEqualityError() {
          Single<Boolean> o = Observable.sequenceEqual(
                  Observable.just("one"), Observable.just("one"),
                  new BiPredicate<String, String>() {
                      @Override
                      public boolean test(String t1, String t2) {
                          throw new TestException();
                      }
                  });
          verifyError(o);
      }
  
      private void verifyResult(Observable<Boolean> o, boolean result) {
          Observer<Boolean> observer = TestHelper.mockObserver();
  
          o.subscribe(observer);
  
          InOrder inOrder = inOrder(observer);
          inOrder.verify(observer, times(1)).onNext(result);
          inOrder.verify(observer).onComplete();
          inOrder.verifyNoMoreInteractions();
      }
  
      @Test
      public void prefetch() {
          Observable.sequenceEqual(Observable.range(1, 20), Observable.range(1, 20), 2)
          .test()
          .assertResult(true);
      }
  
      @Test
      public void disposed() {
          TestHelper.checkDisposed(Observable.sequenceEqual(Observable.just(1), Observable.just(2)));
      }
  
      @Test
      public void simpleInequal() {
          Observable.sequenceEqual(Observable.just(1), Observable.just(2))
          .test()
          .assertResult(false);
      }
  
      @Test
      public void simpleInequalObservable() {
          Observable.sequenceEqual(Observable.just(1), Observable.just(2))
          .toObservable()
          .test()
          .assertResult(false);
      }
  
      @Test
      public void onNextCancelRace() {
          for (int i = 0; i < TestHelper.RACE_DEFAULT_LOOPS; i++) {
              final PublishSubject<Integer> ps = PublishSubject.create();
  
              final TestObserver<Boolean> to = Observable.sequenceEqual(Observable.never(), ps).test();
  
              Runnable r1 = new Runnable() {
                  @Override
                  public void run() {
                      to.dispose();
                  }
              };
  
              Runnable r2 = new Runnable() {
                  @Override
                  public void run() {
                      ps.onNext(1);
                  }
              };
  
              TestHelper.race(r1, r2);
  
              to.assertEmpty();
          }
      }
  
      @Test
      public void onNextCancelRaceObservable() {
          for (int i = 0; i < TestHelper.RACE_DEFAULT_LOOPS; i++) {
              final PublishSubject<Integer> ps = PublishSubject.create();
  
              final TestObserver<Boolean> to = Observable.sequenceEqual(Observable.never(), ps).toObservable().test();
  
              Runnable r1 = new Runnable() {
                  @Override
                  public void run() {
                      to.dispose();
                  }
              };
  
              Runnable r2 = new Runnable() {
                  @Override
                  public void run() {
                      ps.onNext(1);
                  }
              };
  
              TestHelper.race(r1, r2);
  
              to.assertEmpty();
          }
      }
  
      @Test
      public void firstCompletesBeforeSecond() {
          Observable.sequenceEqual(Observable.just(1), Observable.empty())
          .test()
          .assertResult(false);
      }
  
      @Test
      public void secondCompletesBeforeFirst() {
          Observable.sequenceEqual(Observable.empty(), Observable.just(1))
          .test()
          .assertResult(false);
      }
  
      @Test
      public void bothEmpty() {
          Observable.sequenceEqual(Observable.empty(), Observable.empty())
          .test()
          .assertResult(true);
      }
  
      @Test
      public void bothJust() {
          Observable.sequenceEqual(Observable.just(1), Observable.just(1))
          .test()
          .assertResult(true);
      }
  
      @Test
      public void bothCompleteWhileComparing() {
          PublishSubject<Integer> ps1 = PublishSubject.create();
          PublishSubject<Integer> ps2 = PublishSubject.create();
  
          TestObserver<Boolean> to = Observable.sequenceEqual(ps1, ps2, (a, b) -> {
              ps1.onNext(1);
              ps1.onComplete();
  
              ps2.onNext(1);
              ps2.onComplete();
              return a.equals(b);
          })
          .test()
          ;
  
          ps1.onNext(0);
          ps2.onNext(0);
  
          to.assertResult(true);
      }
  
      @Test
      public void bothCompleteWhileComparingAsObservable() {
          PublishSubject<Integer> ps1 = PublishSubject.create();
          PublishSubject<Integer> ps2 = PublishSubject.create();
  
          TestObserver<Boolean> to = Observable.sequenceEqual(ps1, ps2, (a, b) -> {
              ps1.onNext(1);
              ps1.onComplete();
  
              ps2.onNext(1);
              ps2.onComplete();
              return a.equals(b);
          })
          .toObservable()
          .test()
          ;
  
          ps1.onNext(0);
          ps2.onNext(0);
  
          to.assertResult(true);
      }
  }
  