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.dse.driver.internal.core.cql.reactive;
  
  import static org.assertj.core.api.Assertions.assertThat;
  
  import org.junit.Test;
  
  public class SimpleUnicastProcessorTest {
  
    /** Test for JAVA-2387. */
    @Test
    public void should_propagate_upstream_signals_when_downstream_already_subscribed() {
      // given
      SimpleUnicastProcessor<Integer> processor = new SimpleUnicastProcessor<>();
      TestSubscriber<Integer> subscriber = new TestSubscriber<>();
      // when
      processor.subscribe(subscriber); // subscription happens before signals arrive
      processor.onNext(1);
      processor.onComplete();
      subscriber.awaitTermination();
      // then
      assertThat(subscriber.getElements()).hasSize(1).containsExactly(1);
      assertThat(subscriber.getError()).isNull();
    }
  
    @Test
    public void should_delay_upstream_signals_until_downstream_is_subscribed() {
      // given
      SimpleUnicastProcessor<Integer> processor = new SimpleUnicastProcessor<>();
      TestSubscriber<Integer> subscriber = new TestSubscriber<>();
      // when
      processor.onNext(1);
      processor.onComplete();
      processor.subscribe(subscriber); // subscription happens after signals arrive
      subscriber.awaitTermination();
      // then
      assertThat(subscriber.getElements()).hasSize(1).containsExactly(1);
      assertThat(subscriber.getError()).isNull();
    }
  }
  