Update core/src/test/java/com/datastax/oss/driver/internal/core/session/throttling/ConcurrencyLimitingRequestThrottlerTest.java

Co-authored-by: Andrew Tolbert <[email protected]>

Author: jasonk000

core/src/test/java/com/datastax/oss/driver/internal/core/session/throttling/ConcurrencyLimitingRequestThrottlerTest.java

@@ -358,6 +358,7 @@ public void should_enqueue_tasks_quickly_when_callbacks_blocked() throws Interru
 
     for (int i = 0; i < threads.length; i++) {
       threads[i].join(1_000);
+      assertThat(threads[i].isAlive()).isFalse();
     }
   }
 }