Fixed most reported issues by SonarCloud.

role-object/pom.xml

@@ -39,6 +39,11 @@
       <artifactId>junit</artifactId>
       <scope>test</scope>
     </dependency>
+    <dependency>
+      <groupId>org.junit.jupiter</groupId>
+      <artifactId>junit-jupiter-engine</artifactId>
+      <scope>test</scope>
+    </dependency>
   </dependencies>
 
   <build>

role-object/src/test/java/com/iluwatar/roleobject/ApplicationRoleObjectTest.java

@@ -24,10 +24,12 @@ package com.iluwatar.roleobject;
 
 import org.junit.Test;
 
+import static org.junit.jupiter.api.Assertions.assertDoesNotThrow;
+
 public class ApplicationRoleObjectTest {
 
   @Test
-  public void mainTest() {
-    ApplicationRoleObject.main(new String[]{});
+  public void shouldExecuteApplicationWithoutException() {
+    assertDoesNotThrow(() -> ApplicationRoleObject.main(new String[]{}));
   }
 }