Add main class attribute

build.gradle

@@ -11,3 +11,11 @@ repositories {
 
 dependencies {
 }
+
+jar {
+    manifest {
+        attributes(
+                'Main-Class': 'org.example.Main'
+        )
+    }
+}

src/main/java/org/example/Main.java

@@ -89,6 +89,7 @@ public class Main {
 
         System.out.println(averageAges(people));
 
+        TestChargeVerifier.main(new String[0]);
     }
 
     public static void helloWorld() {