Fixes failed test case.

Signed-off-by: Sanghyeok An <[email protected]>

Author: chickenchickenlove

spring-kafka/src/test/java/org/springframework/kafka/support/SimpleKafkaHeaderMapperTests.java

@@ -255,6 +255,7 @@ void multiValueHeaderFromTest() {
 				.build();
 
 		SimpleKafkaHeaderMapper mapper = new SimpleKafkaHeaderMapper();
+		mapper.setMultiValueHeaderPatterns(multiValueHeader1, multiValueHeader2);
 
 		// WHEN
 		Headers results = new RecordHeaders();