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.exceptions.TestException;
  
  public class SingleStartWithTest {
  
      @Test
      public void justCompletableComplete() {
          Single.just(1)
          .startWith(Completable.complete())
          .test()
          .assertResult(1);
      }
  
      @Test
      public void justCompletableError() {
          Single.just(1)
          .startWith(Completable.error(new TestException()))
          .test()
          .assertFailure(TestException.class);
      }
  
      @Test
      public void justSingleJust() {
          Single.just(1)
          .startWith(Single.just(0))
          .test()
          .assertResult(0, 1);
      }
  
      @Test
      public void justSingleError() {
          Single.just(1)
          .startWith(Single.error(new TestException()))
          .test()
          .assertFailure(TestException.class);
      }
  
      @Test
      public void justMaybeJust() {
          Single.just(1)
          .startWith(Maybe.just(0))
          .test()
          .assertResult(0, 1);
      }
  
      @Test
      public void justMaybeEmpty() {
          Single.just(1)
          .startWith(Maybe.empty())
          .test()
          .assertResult(1);
      }
  
      @Test
      public void justMaybeError() {
          Single.just(1)
          .startWith(Maybe.error(new TestException()))
          .test()
          .assertFailure(TestException.class);
      }
  
      @Test
      public void justObservableJust() {
          Single.just(1)
          .startWith(Observable.just(-1, 0))
          .test()
          .assertResult(-1, 0, 1);
      }
  
      @Test
      public void justObservableEmpty() {
          Single.just(1)
          .startWith(Observable.empty())
          .test()
          .assertResult(1);
      }
  
      @Test
      public void justObservableError() {
          Single.just(1)
          .startWith(Observable.error(new TestException()))
          .test()
          .assertFailure(TestException.class);
      }
  
      @Test
      public void justFlowableJust() {
          Single.just(1)
          .startWith(Flowable.just(-1, 0))
          .test()
          .assertResult(-1, 0, 1);
      }
  
      @Test
      public void justFlowableEmpty() {
          Single.just(1)
          .startWith(Observable.empty())
          .test()
          .assertResult(1);
      }
  
      @Test
      public void justFlowableError() {
          Single.just(1)
          .startWith(Flowable.error(new TestException()))
          .test()
          .assertFailure(TestException.class);
      }
  }
  