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.flowable;
  
  import static org.junit.Assert.assertEquals;
  
  import java.util.List;
  
  import org.junit.Test;
  
  import io.reactivex.rxjava3.core.*;
  import io.reactivex.rxjava3.exceptions.TestException;
  import io.reactivex.rxjava3.functions.*;
  import io.reactivex.rxjava3.internal.functions.Functions;
  import io.reactivex.rxjava3.plugins.RxJavaPlugins;
  import io.reactivex.rxjava3.subscribers.TestSubscriber;
  import io.reactivex.rxjava3.testsupport.TestHelper;
  
  public class FlowableGenerateTest extends RxJavaTest {
  
      @Test
      public void statefulBiconsumer() {
          Flowable.generate(new Supplier<Object>() {
              @Override
              public Object get() throws Exception {
                  return 10;
              }
          }, new BiConsumer<Object, Emitter<Object>>() {
              @Override
              public void accept(Object s, Emitter<Object> e) throws Exception {
                  e.onNext(s);
              }
          }, new Consumer<Object>() {
              @Override
              public void accept(Object d) throws Exception {
  
              }
          })
          .take(5)
          .test()
          .assertResult(10, 10, 10, 10, 10);
      }
  
      @Test
      public void stateSupplierThrows() {
          Flowable.generate(new Supplier<Object>() {
              @Override
              public Object get() throws Exception {
                  throw new TestException();
              }
          }, new BiConsumer<Object, Emitter<Object>>() {
              @Override
              public void accept(Object s, Emitter<Object> e) throws Exception {
                  e.onNext(s);
              }
          }, Functions.emptyConsumer())
          .test()
          .assertFailure(TestException.class);
      }
  
      @Test
      public void generatorThrows() {
          Flowable.generate(new Supplier<Object>() {
              @Override
              public Object get() throws Exception {
                  return 1;
              }
          }, new BiConsumer<Object, Emitter<Object>>() {
              @Override
              public void accept(Object s, Emitter<Object> e) throws Exception {
                  throw new TestException();
              }
          }, Functions.emptyConsumer())
          .test()
          .assertFailure(TestException.class);
      }
  
      @Test
      public void disposerThrows() {
          List<Throwable> errors = TestHelper.trackPluginErrors();
          try {
              Flowable.generate(new Supplier<Object>() {
                  @Override
                  public Object get() throws Exception {
                      return 1;
                  }
              }, new BiConsumer<Object, Emitter<Object>>() {
                  @Override
                  public void accept(Object s, Emitter<Object> e) throws Exception {
                      e.onComplete();
                  }
              }, new Consumer<Object>() {
                  @Override
                  public void accept(Object d) throws Exception {
                      throw new TestException();
                  }
              })
              .test()
              .assertResult();
  
              TestHelper.assertUndeliverable(errors, 0, TestException.class);
          } finally {
              RxJavaPlugins.reset();
          }
      }
  
      @Test
      public void dispose() {
          TestHelper.checkDisposed(Flowable.generate(new Supplier<Object>() {
                  @Override
                  public Object get() throws Exception {
                      return 1;
                  }
              }, new BiConsumer<Object, Emitter<Object>>() {
                  @Override
                  public void accept(Object s, Emitter<Object> e) throws Exception {
                      e.onComplete();
                  }
              }, Functions.emptyConsumer()));
      }
  
      @Test
      public void nullError() {
          final int[] call = { 0 };
          Flowable.generate(Functions.justSupplier(1),
          new BiConsumer<Integer, Emitter<Object>>() {
              @Override
              public void accept(Integer s, Emitter<Object> e) throws Exception {
                  try {
                      e.onError(null);
                  } catch (NullPointerException ex) {
                      call[0]++;
                  }
              }
          }, Functions.emptyConsumer())
          .test()
          .assertFailure(NullPointerException.class);
  
          assertEquals(0, call[0]);
      }
  
      @Test
      public void badRequest() {
          TestHelper.assertBadRequestReported(Flowable.generate(new Supplier<Object>() {
                  @Override
                  public Object get() throws Exception {
                      return 1;
                  }
              }, new BiConsumer<Object, Emitter<Object>>() {
                  @Override
                  public void accept(Object s, Emitter<Object> e) throws Exception {
                      e.onComplete();
                  }
              }, Functions.emptyConsumer()));
      }
  
      @Test
      public void rebatchAndTake() {
          Flowable.generate(new Supplier<Object>() {
              @Override
              public Object get() throws Exception {
                  return 1;
              }
          }, new BiConsumer<Object, Emitter<Object>>() {
              @Override
              public void accept(Object s, Emitter<Object> e) throws Exception {
                  e.onNext(1);
              }
          }, Functions.emptyConsumer())
          .rebatchRequests(1)
          .take(5)
          .test()
          .assertResult(1, 1, 1, 1, 1);
      }
  
      @Test
      public void backpressure() {
          Flowable.generate(new Supplier<Object>() {
              @Override
              public Object get() throws Exception {
                  return 1;
              }
          }, new BiConsumer<Object, Emitter<Object>>() {
              @Override
              public void accept(Object s, Emitter<Object> e) throws Exception {
                  e.onNext(1);
              }
          }, Functions.emptyConsumer())
          .rebatchRequests(1)
          .to(TestHelper.<Object>testSubscriber(5L))
          .assertSubscribed()
          .assertValues(1, 1, 1, 1, 1)
          .assertNoErrors()
          .assertNotComplete();
      }
  
      @Test
      public void requestRace() {
          Flowable<Object> source = Flowable.generate(new Supplier<Object>() {
              @Override
              public Object get() throws Exception {
                  return 1;
              }
          }, new BiConsumer<Object, Emitter<Object>>() {
              @Override
              public void accept(Object s, Emitter<Object> e) throws Exception {
                  e.onNext(1);
              }
          }, Functions.emptyConsumer());
  
          for (int i = 0; i < TestHelper.RACE_DEFAULT_LOOPS; i++) {
              final TestSubscriber<Object> ts = source.test(0L);
  
              Runnable r = new Runnable() {
                  @Override
                  public void run() {
                      for (int j = 0; j < 500; j++) {
                          ts.request(1);
                      }
                  }
              };
  
              TestHelper.race(r, r);
  
              ts.assertValueCount(1000);
          }
      }
  
      @Test
      public void multipleOnNext() {
          Flowable.generate(new Consumer<Emitter<Object>>() {
              @Override
              public void accept(Emitter<Object> e) throws Exception {
                  e.onNext(1);
                  e.onNext(2);
              }
          })
          .test(1)
          .assertFailure(IllegalStateException.class, 1);
      }
  
      @Test
      public void multipleOnError() {
          List<Throwable> errors = TestHelper.trackPluginErrors();
          try {
              Flowable.generate(new Consumer<Emitter<Object>>() {
                  @Override
                  public void accept(Emitter<Object> e) throws Exception {
                      e.onError(new TestException("First"));
                      e.onError(new TestException("Second"));
                  }
              })
              .test(1)
              .assertFailure(TestException.class);
  
              TestHelper.assertUndeliverable(errors, 0, TestException.class, "Second");
          } finally {
              RxJavaPlugins.reset();
          }
      }
  
      @Test
      public void multipleOnComplete() {
          Flowable.generate(new Consumer<Emitter<Object>>() {
              @Override
              public void accept(Emitter<Object> e) throws Exception {
                  e.onComplete();
                  e.onComplete();
              }
          })
          .test(1)
          .assertResult();
      }
  
      @Test
      public void onNextAfterOnComplete() {
          Flowable.generate(new Consumer<Emitter<Object>>() {
              @Override
              public void accept(Emitter<Object> e) throws Exception {
                  e.onComplete();
                  e.onNext(1);
              }
          })
          .test()
          .assertResult();
      }
  }
  