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.exceptions;
  
  import static org.junit.Assert.*;
  
  import java.io.IOException;
  import java.util.List;
  import java.util.concurrent.atomic.AtomicInteger;
  
  import org.junit.Test;
  
  import io.reactivex.rxjava3.core.*;
  import io.reactivex.rxjava3.disposables.Disposable;
  import io.reactivex.rxjava3.functions.Consumer;
  import io.reactivex.rxjava3.internal.util.ExceptionHelper;
  import io.reactivex.rxjava3.plugins.RxJavaPlugins;
  import io.reactivex.rxjava3.subjects.PublishSubject;
  import io.reactivex.rxjava3.testsupport.TestHelper;
  
  public class ExceptionsTest extends RxJavaTest {
  
      @Test
      public void constructorShouldBePrivate() {
          TestHelper.checkUtilityClass(ExceptionHelper.class);
      }
  
      @Test
      public void onErrorNotImplementedIsThrown() {
          List<Throwable> errors = TestHelper.trackPluginErrors();
  
          Observable.just(1, 2, 3).subscribe(new Consumer<Integer>() {
  
              @Override
              public void accept(Integer t1) {
                  throw new RuntimeException("hello");
              }
  
          });
  
          TestHelper.assertError(errors, 0, RuntimeException.class);
          assertTrue(errors.get(0).toString(), errors.get(0).getMessage().contains("hello"));
          RxJavaPlugins.reset();
      }
  
      @Test
      public void stackOverflowWouldOccur() {
          final PublishSubject<Integer> a = PublishSubject.create();
          final PublishSubject<Integer> b = PublishSubject.create();
          final int MAX_STACK_DEPTH = 800;
          final AtomicInteger depth = new AtomicInteger();
  
          a.subscribe(new Observer<Integer>() {
  
              @Override
              public void onSubscribe(Disposable d) {
  
              }
  
              @Override
              public void onComplete() {
  
              }
  
              @Override
              public void onError(Throwable e) {
                  e.printStackTrace();
              }
  
              @Override
              public void onNext(Integer n) {
                  b.onNext(n + 1);
              }
          });
          b.subscribe(new Observer<Integer>() {
  
              @Override
              public void onSubscribe(Disposable d) {
                  // TODO Auto-generated method stub
  
              }
  
              @Override
              public void onComplete() {
  
              }
  
              @Override
              public void onError(Throwable e) {
                  e.printStackTrace();
              }
  
              @Override
              public void onNext(Integer n) {
                  if (depth.get() < MAX_STACK_DEPTH) {
                      depth.set(Thread.currentThread().getStackTrace().length);
                      a.onNext(n + 1);
                  }
              }
          });
          a.onNext(1);
          assertTrue(depth.get() >= MAX_STACK_DEPTH);
      }
  
      @Test(expected = StackOverflowError.class)
      public void stackOverflowErrorIsThrown() {
          Observable.just(1).subscribe(new Observer<Integer>() {
  
              @Override
              public void onSubscribe(Disposable d) {
  
              }
  
              @Override
              public void onComplete() {
  
              }
  
              @Override
              public void onError(Throwable e) {
                  e.printStackTrace();
              }
  
              @Override
              public void onNext(Integer t) {
                  throw new StackOverflowError();
              }
  
          });
      }
  
      @Test(expected = ThreadDeath.class)
      public void threadDeathIsThrown() {
          Observable.just(1).subscribe(new Observer<Integer>() {
  
              @Override
              public void onSubscribe(Disposable d) {
  
              }
  
              @Override
              public void onComplete() {
  
              }
  
              @Override
              public void onError(Throwable e) {
                  e.printStackTrace();
              }
  
              @Override
              public void onNext(Integer t) {
                  throw new ThreadDeath();
              }
  
          });
      }
  
      @Test
      public void utilityClass() {
          TestHelper.checkUtilityClass(Exceptions.class);
      }
  
      @Test
      public void manualThrowIfFatal() {
  
          try {
              Exceptions.throwIfFatal(new ThreadDeath());
              fail("Didn't throw fatal exception");
          } catch (ThreadDeath ex) {
              // expected
          }
  
          try {
              Exceptions.throwIfFatal(new LinkageError());
              fail("Didn't throw fatal error");
          } catch (LinkageError ex) {
              // expected
          }
  
          try {
              ExceptionHelper.wrapOrThrow(new LinkageError());
              fail("Didn't propagate Error");
          } catch (LinkageError ex) {
              // expected
          }
      }
  
      @Test
      public void manualPropagate() {
  
          try {
              Exceptions.propagate(new InternalError());
              fail("Didn't throw exception");
          } catch (InternalError ex) {
              // expected
          }
  
          try {
              throw Exceptions.propagate(new IllegalArgumentException());
          } catch (IllegalArgumentException ex) {
              // expected
          }
  
          try {
              throw ExceptionHelper.wrapOrThrow(new IOException());
          } catch (RuntimeException ex) {
              if (!(ex.getCause() instanceof IOException)) {
                  fail(ex.toString() + ": should have thrown RuntimeException(IOException)");
              }
          }
      }
  
      @Test
      public void errorNotImplementedNull1() {
          OnErrorNotImplementedException ex = new OnErrorNotImplementedException(null);
  
          assertTrue("" + ex.getCause(), ex.getCause() instanceof NullPointerException);
      }
  
      @Test
      public void errorNotImplementedNull2() {
          OnErrorNotImplementedException ex = new OnErrorNotImplementedException("Message", null);
  
          assertTrue("" + ex.getCause(), ex.getCause() instanceof NullPointerException);
      }
  
      @Test
      public void errorNotImplementedWithCause() {
          OnErrorNotImplementedException ex = new OnErrorNotImplementedException("Message", new TestException("Forced failure"));
  
          assertTrue("" + ex.getCause(), ex.getCause() instanceof TestException);
  
          assertEquals("" + ex.getCause(), "Forced failure", ex.getCause().getMessage());
      }
  }
  