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.observable;
  
  import static org.mockito.Mockito.*;
  
  import org.junit.Test;
  
  import io.reactivex.rxjava3.core.*;
  import io.reactivex.rxjava3.exceptions.TestException;
  
  public class ObservableStartWithTest {
  
      @Test
      public void justCompletableComplete() {
          Observable.just(1).startWith(Completable.complete())
          .test()
          .assertResult(1);
      }
  
      @Test
      public void emptyCompletableComplete() {
          Observable.empty().startWith(Completable.complete())
          .test()
          .assertResult();
      }
  
      @Test
      public void runCompletableError() {
          Runnable run = mock(Runnable.class);
  
          Observable.fromRunnable(run).startWith(Completable.error(new TestException()))
          .test()
          .assertFailure(TestException.class);
  
          verify(run, never()).run();
      }
  
      @Test
      public void justSingleJust() {
          Observable.just(1).startWith(Single.just(2))
          .test()
          .assertResult(2, 1);
      }
  
      @Test
      public void emptySingleJust() {
          Runnable run = mock(Runnable.class);
  
          Observable.fromRunnable(run)
          .startWith(Single.just(2))
          .test()
          .assertResult(2);
  
          verify(run).run();
      }
  
      @Test
      public void runSingleError() {
          Runnable run = mock(Runnable.class);
  
          Observable.fromRunnable(run).startWith(Single.error(new TestException()))
          .test()
          .assertFailure(TestException.class);
  
          verify(run, never()).run();
      }
  
      @Test
      public void justMaybeJust() {
          Observable.just(1).startWith(Maybe.just(2))
          .test()
          .assertResult(2, 1);
      }
  
      @Test
      public void emptyMaybeJust() {
          Runnable run = mock(Runnable.class);
  
          Observable.fromRunnable(run)
          .startWith(Maybe.just(2))
          .test()
          .assertResult(2);
  
          verify(run).run();
      }
  
      @Test
      public void runMaybeError() {
          Runnable run = mock(Runnable.class);
  
          Observable.fromRunnable(run).startWith(Maybe.error(new TestException()))
          .test()
          .assertFailure(TestException.class);
  
          verify(run, never()).run();
      }
  
      @Test
      public void justObservableJust() {
          Observable.just(1).startWith(Observable.just(2, 3, 4, 5))
          .test()
          .assertResult(2, 3, 4, 5, 1);
      }
  
      @Test
      public void emptyObservableJust() {
          Runnable run = mock(Runnable.class);
  
          Observable.fromRunnable(run)
          .startWith(Observable.just(2, 3, 4, 5))
          .test()
          .assertResult(2, 3, 4, 5);
  
          verify(run).run();
      }
  
      @Test
      public void emptyObservableEmpty() {
          Runnable run = mock(Runnable.class);
          Runnable run2 = mock(Runnable.class);
  
          Observable.fromRunnable(run)
          .startWith(Observable.fromRunnable(run2))
          .test()
          .assertResult();
  
          verify(run).run();
          verify(run2).run();
      }
  
      @Test
      public void runObservableError() {
          Runnable run = mock(Runnable.class);
  
          Observable.fromRunnable(run).startWith(Observable.error(new TestException()))
          .test()
          .assertFailure(TestException.class);
  
          verify(run, never()).run();
      }
  }
  