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.subjects;
  
  import static org.junit.Assert.*;
  
  import java.io.IOException;
  import java.util.List;
  
  import org.junit.Test;
  
  import io.reactivex.rxjava3.core.*;
  import io.reactivex.rxjava3.disposables.*;
  import io.reactivex.rxjava3.observers.TestObserver;
  import io.reactivex.rxjava3.plugins.RxJavaPlugins;
  import io.reactivex.rxjava3.testsupport.TestHelper;
  
  public class MaybeSubjectTest extends RxJavaTest {
  
      @Test
      public void success() {
          MaybeSubject<Integer> ms = MaybeSubject.create();
  
          assertFalse(ms.hasValue());
          assertNull(ms.getValue());
          assertFalse(ms.hasComplete());
          assertFalse(ms.hasThrowable());
          assertNull(ms.getThrowable());
          assertFalse(ms.hasObservers());
          assertEquals(0, ms.observerCount());
  
          TestObserver<Integer> to = ms.test();
  
          to.assertEmpty();
  
          assertTrue(ms.hasObservers());
          assertEquals(1, ms.observerCount());
  
          ms.onSuccess(1);
  
          assertTrue(ms.hasValue());
          assertEquals(1, ms.getValue().intValue());
          assertFalse(ms.hasComplete());
          assertFalse(ms.hasThrowable());
          assertNull(ms.getThrowable());
          assertFalse(ms.hasObservers());
          assertEquals(0, ms.observerCount());
  
          to.assertResult(1);
  
          ms.test().assertResult(1);
  
          assertTrue(ms.hasValue());
          assertEquals(1, ms.getValue().intValue());
          assertFalse(ms.hasComplete());
          assertFalse(ms.hasThrowable());
          assertNull(ms.getThrowable());
          assertFalse(ms.hasObservers());
          assertEquals(0, ms.observerCount());
      }
  
      @Test
      public void once() {
          MaybeSubject<Integer> ms = MaybeSubject.create();
  
          TestObserver<Integer> to = ms.test();
  
          ms.onSuccess(1);
          ms.onSuccess(2);
  
          List<Throwable> errors = TestHelper.trackPluginErrors();
          try {
              ms.onError(new IOException());
  
              TestHelper.assertUndeliverable(errors, 0, IOException.class);
          } finally {
              RxJavaPlugins.reset();
          }
          ms.onComplete();
  
          to.assertResult(1);
      }
  
      @Test
      public void error() {
          MaybeSubject<Integer> ms = MaybeSubject.create();
  
          assertFalse(ms.hasValue());
          assertNull(ms.getValue());
          assertFalse(ms.hasComplete());
          assertFalse(ms.hasThrowable());
          assertNull(ms.getThrowable());
          assertFalse(ms.hasObservers());
          assertEquals(0, ms.observerCount());
  
          TestObserver<Integer> to = ms.test();
  
          to.assertEmpty();
  
          assertTrue(ms.hasObservers());
          assertEquals(1, ms.observerCount());
  
          ms.onError(new IOException());
  
          assertFalse(ms.hasValue());
          assertNull(ms.getValue());
          assertFalse(ms.hasComplete());
          assertTrue(ms.hasThrowable());
          assertTrue(ms.getThrowable().toString(), ms.getThrowable() instanceof IOException);
          assertFalse(ms.hasObservers());
          assertEquals(0, ms.observerCount());
  
          to.assertFailure(IOException.class);
  
          ms.test().assertFailure(IOException.class);
  
          assertFalse(ms.hasValue());
          assertNull(ms.getValue());
          assertFalse(ms.hasComplete());
          assertTrue(ms.hasThrowable());
          assertTrue(ms.getThrowable().toString(), ms.getThrowable() instanceof IOException);
          assertFalse(ms.hasObservers());
          assertEquals(0, ms.observerCount());
      }
  
      @Test
      public void complete() {
          MaybeSubject<Integer> ms = MaybeSubject.create();
  
          assertFalse(ms.hasValue());
          assertNull(ms.getValue());
          assertFalse(ms.hasComplete());
          assertFalse(ms.hasThrowable());
          assertNull(ms.getThrowable());
          assertFalse(ms.hasObservers());
          assertEquals(0, ms.observerCount());
  
          TestObserver<Integer> to = ms.test();
  
          to.assertEmpty();
  
          assertTrue(ms.hasObservers());
          assertEquals(1, ms.observerCount());
  
          ms.onComplete();
  
          assertFalse(ms.hasValue());
          assertNull(ms.getValue());
          assertTrue(ms.hasComplete());
          assertFalse(ms.hasThrowable());
          assertNull(ms.getThrowable());
          assertFalse(ms.hasObservers());
          assertEquals(0, ms.observerCount());
  
          to.assertResult();
  
          ms.test().assertResult();
  
          assertFalse(ms.hasValue());
          assertNull(ms.getValue());
          assertTrue(ms.hasComplete());
          assertFalse(ms.hasThrowable());
          assertNull(ms.getThrowable());
          assertFalse(ms.hasObservers());
          assertEquals(0, ms.observerCount());
      }
  
      @Test
      public void cancelOnArrival() {
          MaybeSubject.create()
          .test(true)
          .assertEmpty();
      }
  
      @Test
      public void cancelOnArrival2() {
          MaybeSubject<Integer> ms = MaybeSubject.create();
  
          ms.test();
  
          ms
          .test(true)
          .assertEmpty();
      }
  
      @Test
      public void dispose() {
          TestHelper.checkDisposed(MaybeSubject.create());
      }
  
      @Test
      public void disposeTwice() {
          MaybeSubject.create()
          .subscribe(new MaybeObserver<Object>() {
              @Override
              public void onSubscribe(Disposable d) {
                  assertFalse(d.isDisposed());
  
                  d.dispose();
                  d.dispose();
  
                  assertTrue(d.isDisposed());
              }
  
              @Override
              public void onSuccess(Object value) {
  
              }
  
              @Override
              public void onError(Throwable e) {
  
              }
  
              @Override
              public void onComplete() {
  
              }
          });
      }
  
      @Test
      public void onSubscribeDispose() {
          MaybeSubject<Integer> ms = MaybeSubject.create();
  
          Disposable d = Disposable.empty();
  
          ms.onSubscribe(d);
  
          assertFalse(d.isDisposed());
  
          ms.onComplete();
  
          d = Disposable.empty();
  
          ms.onSubscribe(d);
  
          assertTrue(d.isDisposed());
      }
  
      @Test
      public void addRemoveRace() {
          for (int i = 0; i < TestHelper.RACE_DEFAULT_LOOPS; i++) {
              final MaybeSubject<Integer> ms = MaybeSubject.create();
  
              final TestObserver<Integer> to = ms.test();
  
              Runnable r1 = new Runnable() {
                  @Override
                  public void run() {
                      ms.test();
                  }
              };
  
              Runnable r2 = new Runnable() {
                  @Override
                  public void run() {
                      to.dispose();
                  }
              };
              TestHelper.race(r1, r2);
          }
      }
  }
  