frankvicky commented on code in PR #21409:
URL: https://github.com/apache/kafka/pull/21409#discussion_r2775416688


##########
streams/src/test/java/org/apache/kafka/streams/state/internals/HeadersSerializerTest.java:
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@@ -131,29 +129,4 @@ public void shouldSerializeHeadersWithEmptyValue() {
         assertEquals("key1", header.key());
         assertArrayEquals(new byte[0], header.value());
     }
-
-    @Test
-    public void shouldSerializeHeadersWithSpecialCharacters() {

Review Comment:
   TL;DR It should be useless if we only test `_`, `-`, `.`, they are common in 
daily use. If we want to keep this case, we should test some edge case(e.g. 
emoji).
   ref: https://github.com/apache/kafka/pull/21401#discussion_r2773432276



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