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 org.junit.Test;
  
  import io.reactivex.rxjava3.core.*;
  import io.reactivex.rxjava3.disposables.Disposable;
  
  public class SingleLiftTest extends RxJavaTest {
  
      @Test
      public void normal() {
  
          Single.just(1).lift(new SingleOperator<Integer, Integer>() {
              @Override
              public SingleObserver<Integer> apply(final SingleObserver<? super Integer> observer) throws Exception {
                  return new SingleObserver<Integer>() {
  
                      @Override
                      public void onSubscribe(Disposable d) {
                          observer.onSubscribe(d);
                      }
  
                      @Override
                      public void onSuccess(Integer value) {
                          observer.onSuccess(value + 1);
                      }
  
                      @Override
                      public void onError(Throwable e) {
                          observer.onError(e);
                      }
                  };
              }
          })
          .test()
          .assertResult(2);
      }
  }
  