docs: update event aggregator docs

event-aggregator/src/test/java/com/iluwatar/event/aggregator/AppTest.java

@@ -35,7 +35,6 @@ class AppTest {
 
   /**
    * Issue: Add at least one assertion to this test case.
-   *
    * Solution: Inserted assertion to check whether the execution of the main method in {@link App#main(String[])}
    * throws an exception.
    */

event-aggregator/src/test/java/com/iluwatar/event/aggregator/KingJoffreyTest.java

@@ -67,14 +67,14 @@ class KingJoffreyTest {
       assertEquals(i, appender.getLogSize());
       var event = Event.values()[i];
       kingJoffrey.onEvent(event);
-      final var expectedMessage = "Received event from the King's Hand: " + event.toString();
+      final var expectedMessage = "Received event from the King's Hand: " + event;
       assertEquals(expectedMessage, appender.getLastMessage());
       assertEquals(i + 1, appender.getLogSize());
     });
 
   }
 
-  private class InMemoryAppender extends AppenderBase<ILoggingEvent> {
+  private static class InMemoryAppender extends AppenderBase<ILoggingEvent> {
     private final List<ILoggingEvent> log = new LinkedList<>();
 
     public InMemoryAppender(Class<?> clazz) {

event-aggregator/src/test/java/com/iluwatar/event/aggregator/KingsHandTest.java

@@ -49,11 +49,11 @@ class KingsHandTest extends EventEmitterTest<KingsHand> {
 
   /**
    * The {@link KingsHand} is both an {@link EventEmitter} as an {@link EventObserver} so verify if
-   * every event received is passed up to it's superior, in most cases {@link KingJoffrey} but now
+   * every event received is passed up to its superior, in most cases {@link KingJoffrey} but now
    * just a mocked observer.
    */
   @Test
-  void testPassThrough() throws Exception {
+  void testPassThrough() {
     final var observer = mock(EventObserver.class);
     final var kingsHand = new KingsHand();
     kingsHand.registerObserver(observer, Event.STARK_SIGHTED);