How do you test code that uses opens and reflection?

    // Example of a Java code that uses reflection
    import java.lang.reflect.Method;

    public class ReflectionTest {
        public void sayHello() {
            System.out.println("Hello, World!");
        }

        public static void main(String[] args) {
            try {
                ReflectionTest test = new ReflectionTest();
                Method method = test.getClass().getMethod("sayHello");
                method.invoke(test);
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }