MINOR: Remove unnecessary assertDoesNotThrow (#9854)

Reviewers: Chia-Ping Tsai <chia7712@gmail.com>

log4j-appender/src/test/java/org/apache/kafka/log4jappender/KafkaLog4jAppenderTest.java

@@ -36,7 +36,6 @@ import java.util.concurrent.ExecutionException;
 import java.util.concurrent.Future;
 import java.util.concurrent.TimeoutException;
 
-import static org.junit.jupiter.api.Assertions.assertDoesNotThrow;
 import static org.junit.jupiter.api.Assertions.assertEquals;
 import static org.junit.jupiter.api.Assertions.assertThrows;
 
@@ -140,7 +139,7 @@ public class KafkaLog4jAppenderTest {
         MockKafkaLog4jAppender mockKafkaLog4jAppender = getMockKafkaLog4jAppender();
         replaceProducerWithMocked(mockKafkaLog4jAppender, true);
 
-        assertDoesNotThrow(() -> logger.error(getMessage(0)));
+        logger.error(getMessage(0));
     }
 
     @Test
@@ -148,7 +147,7 @@ public class KafkaLog4jAppenderTest {
         Properties props = getLog4jConfigWithRealProducer(true);
         PropertyConfigurator.configure(props);
 
-        assertDoesNotThrow(() -> logger.error(getMessage(0)));
+        logger.error(getMessage(0));
     }
 
     @Test