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.completable;
  
  import static org.junit.Assert.assertEquals;
  import static org.mockito.Mockito.*;
  
  import java.util.concurrent.atomic.AtomicInteger;
  
  import org.junit.Test;
  
  import io.reactivex.rxjava3.core.*;
  import io.reactivex.rxjava3.exceptions.TestException;
  import io.reactivex.rxjava3.functions.Action;
  import io.reactivex.rxjava3.observers.TestObserver;
  import io.reactivex.rxjava3.testsupport.TestHelper;
  
  public class CompletableFromActionTest extends RxJavaTest {
      @Test
      public void fromAction() {
          final AtomicInteger atomicInteger = new AtomicInteger();
  
          Completable.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();
              }
          };
  
          Completable.fromAction(run)
              .test()
              .assertResult();
  
          assertEquals(1, atomicInteger.get());
  
          Completable.fromAction(run)
              .test()
              .assertResult();
  
          assertEquals(2, atomicInteger.get());
      }
  
      @Test
      public void fromActionInvokesLazy() {
          final AtomicInteger atomicInteger = new AtomicInteger();
  
          Completable completable = Completable.fromAction(new Action() {
              @Override
              public void run() throws Exception {
                  atomicInteger.incrementAndGet();
              }
          });
  
          assertEquals(0, atomicInteger.get());
  
          completable
              .test()
              .assertResult();
  
          assertEquals(1, atomicInteger.get());
      }
  
      @Test
      public void fromActionThrows() {
          Completable.fromAction(new Action() {
              @Override
              public void run() throws Exception {
                  throw new UnsupportedOperationException();
              }
          })
              .test()
              .assertFailure(UnsupportedOperationException.class);
      }
  
      @Test
      public void fromActionDisposed() {
          final AtomicInteger calls = new AtomicInteger();
          Completable.fromAction(new Action() {
              @Override
              public void run() throws Exception {
                  calls.incrementAndGet();
              }
          })
          .test(true)
          .assertEmpty();
  
          assertEquals(0, calls.get());
      }
  
      @Test
      public void fromActionErrorsDisposed() {
          final AtomicInteger calls = new AtomicInteger();
          Completable.fromAction(new Action() {
              @Override
              public void run() throws Exception {
                  calls.incrementAndGet();
                  throw new TestException();
              }
          })
          .test(true)
          .assertEmpty();
  
          assertEquals(0, calls.get());
      }
  
      @Test
      public void disposedUpfront() throws Throwable {
          Action run = mock(Action.class);
  
          Completable.fromAction(run)
          .test(true)
          .assertEmpty();
  
          verify(run, never()).run();
      }
  
      @Test
      public void disposeWhileRunningComplete() {
          TestObserver<Void> to = new TestObserver<>();
  
          Completable.fromAction(() -> {
              to.dispose();
          })
          .subscribeWith(to)
          .assertEmpty();
      }
  
      @Test
      public void disposeWhileRunningError() throws Throwable {
          TestHelper.withErrorTracking(errors -> {
              TestObserver<Void> to = new TestObserver<>();
  
              Completable.fromAction(() -> {
                  to.dispose();
                  throw new TestException();
              })
              .subscribeWith(to)
              .assertEmpty();
  
              TestHelper.assertUndeliverable(errors, 0, TestException.class);
          });
      }
  }
  