aljoscha commented on a change in pull request #13828:
URL: https://github.com/apache/flink/pull/13828#discussion_r514086559



##########
File path: 
flink-streaming-java/src/test/java/org/apache/flink/streaming/api/operators/source/SourceOperatorEventTimeTest.java
##########
@@ -133,24 +158,37 @@ public void testPerSplitOutputEventWatermarks() throws 
Exception {
                        (output) -> 
output.createOutputForSplit("two").collect(0, 200L)
                );
 
-               assertThat(result, contains(
-                       new Watermark(100L),
-                       new Watermark(150L),
-                       new Watermark(200L)
-               ));
+               assertWatermarksOrEmpty(
+                               result,
+                               new Watermark(100L),
+                               new Watermark(150L),
+                               new Watermark(200L));
        }
 
        // 
------------------------------------------------------------------------
        //   test execution helpers
        // 
------------------------------------------------------------------------
 
+       /**
+        * Asserts that the given expected watermarks are present in the actual 
watermarks in STREAMING
+        * mode. Otherwise, asserts that the list of actual watermarks is empty 
in BATCH mode.
+        */
+       private void assertWatermarksOrEmpty(List<Watermark> actualWatermarks, 
Watermark... expectedWatermarks) {
+               if (runtimeMode == SourceOperator.RuntimeMode.STREAMING) {
+                       assertThat(actualWatermarks, 
contains(expectedWatermarks));
+               } else {
+                       assertThat(actualWatermarks, empty());
+               }
+       }
+
        @SuppressWarnings("FinalPrivateMethod")
        @SafeVarargs
        private final List<Watermark> testSequenceOfWatermarks(
+                       SourceOperator.RuntimeMode runtimeMode,

Review comment:
       👌




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