Fixed most reported issues by SonarCloud.

update-method/pom.xml

@@ -38,6 +38,11 @@
             <groupId>junit</groupId>
             <artifactId>junit</artifactId>
         </dependency>
+        <dependency>
+            <groupId>org.junit.jupiter</groupId>
+            <artifactId>junit-jupiter-engine</artifactId>
+            <scope>test</scope>
+        </dependency>
     </dependencies>
     <build>
         <plugins>

update-method/src/main/java/com/iluwatar/updatemethod/World.java

@@ -88,6 +88,7 @@ public class World {
    * pattern.
    */
   private void render() {
+    // Does Nothing
   }
 
   /**

update-method/src/test/java/com/iluwatar/updatemethod/AppTest.java

@@ -25,11 +25,12 @@ package com.iluwatar.updatemethod;
 
 import org.junit.Test;
 
+import static org.junit.jupiter.api.Assertions.assertDoesNotThrow;
+
 public class AppTest {
 
   @Test
-  public void testMain() {
-    String[] args = {};
-    App.main(args);
+  public void shouldExecuteApplicationWithoutException() {
+    assertDoesNotThrow(() -> App.main(new String[]{}));
   }
 }