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.*;
  import static org.mockito.Mockito.*;
  
  import java.util.List;
  import java.util.concurrent.*;
  import java.util.concurrent.atomic.AtomicInteger;
  
  import org.junit.Test;
  
  import io.reactivex.rxjava3.core.*;
  import io.reactivex.rxjava3.functions.*;
  import io.reactivex.rxjava3.operators.QueueFuseable;
  import io.reactivex.rxjava3.plugins.RxJavaPlugins;
  import io.reactivex.rxjava3.schedulers.Schedulers;
  import io.reactivex.rxjava3.subscribers.TestSubscriber;
  import io.reactivex.rxjava3.testsupport.*;
  
  public class FlowableFromActionTest extends RxJavaTest {
      @Test
      public void fromAction() {
          final AtomicInteger atomicInteger = new AtomicInteger();
  
          Flowable.fromAction(new Action() {
              @Override
              public void run() throws Exception {
                  atomicInteger.incrementAndGet();
              }
          })
              .test()
              .assertResult();
  
          assertEquals(1, atomicInteger.get());
      }
  
      @Test
      public void fromActionTwice() {
          final AtomicInteger atomicInteger = new AtomicInteger();
  
          Action run = new Action() {
              @Override
              public void run() throws Exception {
                  atomicInteger.incrementAndGet();
              }
          };
  
          Flowable.fromAction(run)
              .test()
              .assertResult();
  
          assertEquals(1, atomicInteger.get());
  
          Flowable.fromAction(run)
              .test()
              .assertResult();
  
          assertEquals(2, atomicInteger.get());
      }
  
      @Test
      public void fromActionInvokesLazy() {
          final AtomicInteger atomicInteger = new AtomicInteger();
  
          Flowable<Object> source = Flowable.fromAction(new Action() {
              @Override
              public void run() throws Exception {
                  atomicInteger.incrementAndGet();
              }
          });
  
          assertEquals(0, atomicInteger.get());
  
          source
              .test()
              .assertResult();
  
          assertEquals(1, atomicInteger.get());
      }
  
      @Test
      public void fromActionThrows() {
          Flowable.fromAction(new Action() {
              @Override
              public void run() throws Exception {
                  throw new UnsupportedOperationException();
              }
          })
              .test()
              .assertFailure(UnsupportedOperationException.class);
      }
  
      @SuppressWarnings("unchecked")
      @Test
      public void callable() throws Throwable {
          final int[] counter = { 0 };
  
          Flowable<Void> m = Flowable.fromAction(new Action() {
              @Override
              public void run() throws Exception {
                  counter[0]++;
              }
          });
  
          assertTrue(m.getClass().toString(), m instanceof Supplier);
  
          assertNull(((Supplier<Void>)m).get());
  
          assertEquals(1, counter[0]);
      }
  
      @Test
      public void noErrorLoss() throws Exception {
          List<Throwable> errors = TestHelper.trackPluginErrors();
          try {
              final CountDownLatch cdl1 = new CountDownLatch(1);
              final CountDownLatch cdl2 = new CountDownLatch(1);
  
              TestSubscriber<Object> ts = Flowable.fromAction(new Action() {
                  @Override
                  public void run() throws Exception {
                      cdl1.countDown();
                      cdl2.await(5, TimeUnit.SECONDS);
                  }
              }).subscribeOn(Schedulers.single()).test();
  
              assertTrue(cdl1.await(5, TimeUnit.SECONDS));
  
              ts.cancel();
  
              int timeout = 10;
  
              while (timeout-- > 0 && errors.isEmpty()) {
                  Thread.sleep(100);
              }
  
              TestHelper.assertUndeliverable(errors, 0, InterruptedException.class);
          } finally {
              RxJavaPlugins.reset();
          }
      }
  
      @Test
      public void disposedUpfront() throws Throwable {
          Action run = mock(Action.class);
  
          Flowable.fromAction(run)
          .test(1L, true)
          .assertEmpty();
  
          verify(run, never()).run();
      }
  
      @Test
      public void cancelWhileRunning() {
          final TestSubscriber<Object> ts = new TestSubscriber<>();
  
          Flowable.fromAction(new Action() {
              @Override
              public void run() throws Exception {
                  ts.cancel();
              }
          })
          .subscribeWith(ts)
          .assertEmpty();
  
          assertTrue(ts.isCancelled());
      }
  
      @Test
      public void asyncFused() throws Throwable {
          TestSubscriberEx<Object> ts = new TestSubscriberEx<>();
          ts.setInitialFusionMode(QueueFuseable.ASYNC);
  
          Action action = mock(Action.class);
  
          Flowable.fromAction(action)
          .subscribe(ts);
  
          ts.assertFusionMode(QueueFuseable.ASYNC)
          .assertResult();
  
          verify(action).run();
      }
  
      @Test
      public void syncFusedRejected() throws Throwable {
          TestSubscriberEx<Object> ts = new TestSubscriberEx<>();
          ts.setInitialFusionMode(QueueFuseable.SYNC);
  
          Action action = mock(Action.class);
  
          Flowable.fromAction(action)
          .subscribe(ts);
  
          ts.assertFusionMode(QueueFuseable.NONE)
          .assertResult();
  
          verify(action).run();
      }
  }
  