content: /*
   * Copyright (C) 2018-2025 Lightbend Inc. <https://www.lightbend.com>
   */
  
  package akka.stream.javadsl;
  
  import static org.junit.Assert.assertEquals;
  
  import akka.NotUsed;
  import akka.stream.StreamTest;
  import akka.stream.ThrottleMode;
  import akka.testkit.AkkaJUnitActorSystemResource;
  import akka.testkit.AkkaSpec;
  import java.util.Collections;
  import java.util.List;
  import java.util.concurrent.CompletionStage;
  import java.util.concurrent.TimeUnit;
  import org.junit.ClassRule;
  import org.junit.Test;
  
  public class FlowThrottleTest extends StreamTest {
    public FlowThrottleTest() {
      super(actorSystemResource);
    }
  
    @ClassRule
    public static AkkaJUnitActorSystemResource actorSystemResource =
        new AkkaJUnitActorSystemResource("ThrottleTest", AkkaSpec.testConf());
  
    @Test
    public void mustWorksForTwoStreams() throws Exception {
      final Flow<Integer, Integer, NotUsed> sharedThrottle =
          Flow.of(Integer.class)
              .throttle(1, java.time.Duration.ofDays(1), 1, ThrottleMode.enforcing());
  
      CompletionStage<List<Integer>> result1 =
          Source.single(1).via(sharedThrottle).via(sharedThrottle).runWith(Sink.seq(), system);
  
      // If there is accidental shared state then we would not be able to pass through the single
      // element
      assertEquals(
          result1.toCompletableFuture().get(3, TimeUnit.SECONDS), Collections.singletonList(1));
  
      // It works with a new stream, too
      CompletionStage<List<Integer>> result2 =
          Source.single(1).via(sharedThrottle).via(sharedThrottle).runWith(Sink.seq(), system);
  
      assertEquals(
          result2.toCompletableFuture().get(3, TimeUnit.SECONDS), Collections.singletonList(1));
    }
  }
  