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.single;
  
  import java.util.List;
  
  import org.junit.Test;
  
  import io.reactivex.rxjava3.core.*;
  import io.reactivex.rxjava3.exceptions.*;
  import io.reactivex.rxjava3.functions.Function;
  import io.reactivex.rxjava3.testsupport.*;
  
  public class SingleOnErrorXTest extends RxJavaTest {
  
      @Test
      public void returnSuccess() {
          Single.just(1)
          .onErrorReturnItem(2)
          .test()
          .assertResult(1);
      }
  
      @Test
      public void resumeThrows() {
          TestObserverEx<Integer> to = Single.<Integer>error(new TestException("Outer"))
          .onErrorReturn(new Function<Throwable, Integer>() {
              @Override
              public Integer apply(Throwable e) throws Exception {
                  throw new TestException("Inner");
              }
          })
          .to(TestHelper.<Integer>testConsumer())
          .assertFailure(CompositeException.class);
  
          List<Throwable> errors = TestHelper.compositeList(to.errors().get(0));
  
          TestHelper.assertError(errors, 0, TestException.class, "Outer");
          TestHelper.assertError(errors, 1, TestException.class, "Inner");
      }
  
      @Test
      public void resumeErrors() {
          Single.error(new TestException("Main"))
          .onErrorResumeWith(Single.error(new TestException("Resume")))
          .to(TestHelper.<Object>testConsumer())
          .assertFailureAndMessage(TestException.class, "Resume");
      }
  
      @Test
      public void resumeDispose() {
          TestHelper.checkDisposed(Single.error(new TestException("Main"))
          .onErrorResumeWith(Single.just(1)));
      }
  
      @Test
      public void resumeDoubleOnSubscribe() {
          TestHelper.checkDoubleOnSubscribeSingle(new Function<Single<Object>, SingleSource<Object>>() {
              @Override
              public SingleSource<Object> apply(Single<Object> s) throws Exception {
                  return s.onErrorResumeWith(Single.just(1));
              }
          });
      }
  
      @Test
      public void resumeSuccess() {
          Single.just(1)
          .onErrorResumeWith(Single.just(2))
          .test()
          .assertResult(1);
      }
  }
  