Merge branch 'SonarCloud-Reports-Issue#1012'

# Conflicts:
#	pom.xml

observer/src/test/java/com/iluwatar/observer/AppTest.java

@@ -25,16 +25,17 @@ package com.iluwatar.observer;
 
 import org.junit.jupiter.api.Test;
 
+import static org.junit.jupiter.api.Assertions.assertDoesNotThrow;
+
 /**
  * 
  * Application test
  *
  */
-public class AppTest {
+class AppTest {
 
   @Test
-  public void test() {
-    String[] args = {};
-    App.main(args);
+  void shouldExecuteApplicationWithoutException() {
+    assertDoesNotThrow(() -> App.main(new String[]{}));
   }
 }