content: /*
   * Licensed to the Apache Software Foundation (ASF) under one
   * or more contributor license agreements.  See the NOTICE file
   * distributed with this work for additional information
   * regarding copyright ownership.  The ASF licenses this file
   * to you 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 com.datastax.oss.driver.internal.core.util.concurrent;
  
  import static org.assertj.core.api.Assertions.assertThat;
  import static org.junit.Assert.fail;
  
  import java.util.Arrays;
  import java.util.concurrent.CompletableFuture;
  import java.util.concurrent.ExecutionException;
  import java.util.concurrent.TimeUnit;
  import org.junit.Test;
  
  public class CompletableFuturesTest {
    @Test
    public void should_not_suppress_identical_exceptions() throws Exception {
      RuntimeException error = new RuntimeException();
      CompletableFuture<Void> future1 = new CompletableFuture<>();
      future1.completeExceptionally(error);
      CompletableFuture<Void> future2 = new CompletableFuture<>();
      future2.completeExceptionally(error);
      try {
        // if timeout exception is thrown, it indicates that CompletableFutures.allSuccessful()
        // did not complete the returned future and potentially caller will wait infinitely
        CompletableFutures.allSuccessful(Arrays.asList(future1, future2))
            .toCompletableFuture()
            .get(1, TimeUnit.SECONDS);
        fail();
      } catch (ExecutionException e) {
        assertThat(e.getCause()).isEqualTo(error);
      }
    }
  }
  