RocMarshal commented on code in PR #22847:
URL: https://github.com/apache/flink/pull/22847#discussion_r1240660246


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flink-streaming-java/src/test/java/org/apache/flink/streaming/api/operators/SourceOperatorAlignmentTest.java:
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@@ -46,12 +46,7 @@ Licensed to the Apache Software Foundation (ASF) under one
 import java.util.concurrent.CompletableFuture;
 import java.util.stream.Collectors;
 
-import static org.hamcrest.CoreMatchers.is;
-import static org.hamcrest.MatcherAssert.assertThat;
-import static org.hamcrest.Matchers.contains;
-import static org.junit.jupiter.api.Assertions.assertEquals;
-import static org.junit.jupiter.api.Assertions.assertFalse;
-import static org.junit.jupiter.api.Assertions.assertTrue;
+import static org.assertj.core.api.Assertions.assertThat;
 
 /** Unit test for {@link SourceOperator} watermark alignment. */

Review Comment:
   Good migration & supplementation~
   Just a minor comment: what about removing the `public` (method or class 
declaration) key-word to adapt the style of junit5 mentioned in  the previous 
discussion ? 



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