refactor: #1012 - Resolve Sonar report: missing assertions in several AppTest classes (#1784)

Co-authored-by: Subhrodip Mohanta <hello@subho.xyz>

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

@@ -23,11 +23,14 @@
 
 package com.iluwatar.filterer;
 
+import static org.junit.jupiter.api.Assertions.assertDoesNotThrow;
+
 import org.junit.jupiter.api.Test;
 
 class AppTest {
+
   @Test
   void shouldLaunchApp() {
-    App.main(new String[]{});
+    assertDoesNotThrow(() -> App.main(new String[]{}));
   }
 }