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 static org.junit.Assert.*;
  
  import java.io.IOException;
  import java.util.List;
  
  import org.junit.Test;
  
  import io.reactivex.rxjava3.core.*;
  import io.reactivex.rxjava3.disposables.*;
  import io.reactivex.rxjava3.exceptions.TestException;
  import io.reactivex.rxjava3.functions.Cancellable;
  import io.reactivex.rxjava3.plugins.RxJavaPlugins;
  import io.reactivex.rxjava3.testsupport.*;
  
  public class SingleCreateTest extends RxJavaTest {
  
      @Test
      @SuppressUndeliverable
      public void basic() {
          final Disposable d = Disposable.empty();
  
          Single.<Integer>create(new SingleOnSubscribe<Integer>() {
              @Override
              public void subscribe(SingleEmitter<Integer> e) throws Exception {
                  e.setDisposable(d);
  
                  e.onSuccess(1);
                  e.onError(new TestException());
                  e.onSuccess(2);
                  e.onError(new TestException());
              }
          })
          .test()
          .assertResult(1);
  
          assertTrue(d.isDisposed());
      }
  
      @Test
      @SuppressUndeliverable
      public void basicWithCancellable() {
          final Disposable d1 = Disposable.empty();
          final Disposable d2 = Disposable.empty();
  
          Single.<Integer>create(new SingleOnSubscribe<Integer>() {
              @Override
              public void subscribe(SingleEmitter<Integer> e) throws Exception {
                  e.setDisposable(d1);
                  e.setCancellable(new Cancellable() {
                      @Override
                      public void cancel() throws Exception {
                          d2.dispose();
                      }
                  });
  
                  e.onSuccess(1);
                  e.onError(new TestException());
                  e.onSuccess(2);
                  e.onError(new TestException());
              }
          })
          .test()
          .assertResult(1);
  
          assertTrue(d1.isDisposed());
          assertTrue(d2.isDisposed());
      }
  
      @Test
      @SuppressUndeliverable
      public void basicWithError() {
          final Disposable d = Disposable.empty();
  
          Single.<Integer>create(new SingleOnSubscribe<Integer>() {
              @Override
              public void subscribe(SingleEmitter<Integer> e) throws Exception {
                  e.setDisposable(d);
  
                  e.onError(new TestException());
                  e.onSuccess(2);
                  e.onError(new TestException());
              }
          })
          .test()
          .assertFailure(TestException.class);
  
          assertTrue(d.isDisposed());
      }
  
      @Test(expected = IllegalArgumentException.class)
      public void unsafeCreate() {
          Single.unsafeCreate(Single.just(1));
      }
  
      @Test
      public void createCallbackThrows() {
          Single.create(new SingleOnSubscribe<Object>() {
              @Override
              public void subscribe(SingleEmitter<Object> s) throws Exception {
                  throw new TestException();
              }
          })
          .test()
          .assertFailure(TestException.class);
      }
  
      @Test
      public void dispose() {
          TestHelper.checkDisposed(Single.create(new SingleOnSubscribe<Object>() {
              @Override
              public void subscribe(SingleEmitter<Object> s) throws Exception {
                  s.onSuccess(1);
              }
          }));
      }
  
      @Test
      public void createNullSuccess() {
          Single.create(new SingleOnSubscribe<Object>() {
              @Override
              public void subscribe(SingleEmitter<Object> s) throws Exception {
                  s.onSuccess(null);
                  s.onSuccess(null);
              }
          })
          .test()
          .assertFailure(NullPointerException.class);
      }
  
      @Test
      public void createNullError() {
          Single.create(new SingleOnSubscribe<Object>() {
              @Override
              public void subscribe(SingleEmitter<Object> s) throws Exception {
                  s.onError(null);
                  s.onError(null);
              }
          })
          .test()
          .assertFailure(NullPointerException.class);
      }
  
      @Test
      public void createConsumerThrows() {
          Single.create(new SingleOnSubscribe<Object>() {
              @Override
              public void subscribe(SingleEmitter<Object> s) throws Exception {
                  try {
                      s.onSuccess(1);
                      fail("Should have thrown");
                  } catch (TestException ex) {
                      // expected
                  }
              }
          })
          .subscribe(new SingleObserver<Object>() {
              @Override
              public void onSubscribe(Disposable d) {
  
              }
  
              @Override
              public void onSuccess(Object value) {
                  throw new TestException();
              }
  
              @Override
              public void onError(Throwable e) {
  
              }
          });
      }
  
      @Test
      public void createConsumerThrowsResource() {
          Single.create(new SingleOnSubscribe<Object>() {
              @Override
              public void subscribe(SingleEmitter<Object> s) throws Exception {
                  Disposable d = Disposable.empty();
                  s.setDisposable(d);
                  try {
                      s.onSuccess(1);
                      fail("Should have thrown");
                  } catch (TestException ex) {
                      // expected
                  }
  
                  assertTrue(d.isDisposed());
              }
          })
          .subscribe(new SingleObserver<Object>() {
              @Override
              public void onSubscribe(Disposable d) {
  
              }
  
              @Override
              public void onSuccess(Object value) {
                  throw new TestException();
              }
  
              @Override
              public void onError(Throwable e) {
  
              }
          });
      }
  
      @Test
      public void createConsumerThrowsOnError() {
          Single.create(new SingleOnSubscribe<Object>() {
              @Override
              public void subscribe(SingleEmitter<Object> s) throws Exception {
                  try {
                      s.onError(new IOException());
                      fail("Should have thrown");
                  } catch (TestException ex) {
                      // expected
                  }
              }
          })
          .subscribe(new SingleObserver<Object>() {
              @Override
              public void onSubscribe(Disposable d) {
              }
  
              @Override
              public void onSuccess(Object value) {
              }
  
              @Override
              public void onError(Throwable e) {
                  throw new TestException();
              }
          });
      }
  
      @Test
      public void createConsumerThrowsResourceOnError() {
          Single.create(new SingleOnSubscribe<Object>() {
              @Override
              public void subscribe(SingleEmitter<Object> s) throws Exception {
                  Disposable d = Disposable.empty();
                  s.setDisposable(d);
                  try {
                      s.onError(new IOException());
                      fail("Should have thrown");
                  } catch (TestException ex) {
                      // expected
                  }
  
                  assertTrue(d.isDisposed());
              }
          })
          .subscribe(new SingleObserver<Object>() {
              @Override
              public void onSubscribe(Disposable d) {
  
              }
  
              @Override
              public void onSuccess(Object value) {
              }
  
              @Override
              public void onError(Throwable e) {
                  throw new TestException();
              }
          });
      }
  
      @Test
      public void tryOnError() {
          List<Throwable> errors = TestHelper.trackPluginErrors();
          try {
              final Boolean[] response = { null };
              Single.create(new SingleOnSubscribe<Object>() {
                  @Override
                  public void subscribe(SingleEmitter<Object> e) throws Exception {
                      e.onSuccess(1);
                      response[0] = e.tryOnError(new TestException());
                  }
              })
              .test()
              .assertResult(1);
  
              assertFalse(response[0]);
  
              assertTrue(errors.toString(), errors.isEmpty());
          } finally {
              RxJavaPlugins.reset();
          }
      }
  
      @Test
      public void emitterHasToString() {
          Single.create(new SingleOnSubscribe<Object>() {
              @Override
              public void subscribe(SingleEmitter<Object> emitter) throws Exception {
                  assertTrue(emitter.toString().contains(SingleCreate.Emitter.class.getSimpleName()));
              }
          }).test().assertEmpty();
      }
  }
  