docs: update publish-subscribe

publish-subscribe/src/test/java/com/iluwatar/publish/subscribe/AppTest.java

@@ -28,7 +28,7 @@ import static org.junit.jupiter.api.Assertions.assertDoesNotThrow;
 
 import org.junit.jupiter.api.Test;
 
-public class AppTest {
+class AppTest {
 
   @Test
   void shouldExecuteApplicationWithoutException() {

publish-subscribe/src/test/java/com/iluwatar/publish/subscribe/LoggerExtension.java

@@ -28,7 +28,6 @@ import ch.qos.logback.classic.Logger;
 import ch.qos.logback.classic.spi.ILoggingEvent;
 import ch.qos.logback.core.read.ListAppender;
 import java.util.List;
-import java.util.stream.Collectors;
 import org.junit.jupiter.api.extension.AfterEachCallback;
 import org.junit.jupiter.api.extension.BeforeEachCallback;
 import org.junit.jupiter.api.extension.ExtensionContext;
@@ -53,12 +52,10 @@ public class LoggerExtension implements BeforeEachCallback, AfterEachCallback {
   }
 
   public List<String> getMessages() {
-    return listAppender.list.stream().map(e -> e.getMessage()).collect(Collectors.toList());
+    return listAppender.list.stream().map(e -> e.getMessage()).toList();
   }
 
   public List<String> getFormattedMessages() {
-    return listAppender.list.stream()
-        .map(e -> e.getFormattedMessage())
-        .collect(Collectors.toList());
+    return listAppender.list.stream().map(e -> e.getFormattedMessage()).toList();
   }
 }

publish-subscribe/src/test/java/com/iluwatar/publish/subscribe/model/MessageTest.java

@@ -29,10 +29,10 @@ import static org.junit.jupiter.api.Assertions.assertInstanceOf;
 
 import org.junit.jupiter.api.Test;
 
-public class MessageTest {
+class MessageTest {
 
   @Test
-  public void testMessage() {
+  void testMessage() {
     final String content = "some content";
     Message message = new Message(content);
     assertInstanceOf(String.class, message.content());

publish-subscribe/src/test/java/com/iluwatar/publish/subscribe/model/TopicTest.java

@@ -33,7 +33,7 @@ import java.lang.reflect.Field;
 import java.util.Set;
 import org.junit.jupiter.api.Test;
 
-public class TopicTest {
+class TopicTest {
 
   private static final String TOPIC_WEATHER = "WEATHER";
 

publish-subscribe/src/test/java/com/iluwatar/publish/subscribe/publisher/PublisherTest.java

@@ -36,7 +36,7 @@ import java.util.Set;
 import org.junit.jupiter.api.Test;
 import org.junit.jupiter.api.extension.RegisterExtension;
 
-public class PublisherTest {
+class PublisherTest {
 
   @RegisterExtension public LoggerExtension loggerExtension = new LoggerExtension();