Test...

import org.junit.jupiter.api.Test;
import static org.junit.jupiter.api.Assertions.*;

public class CalculatorTest {

    @Test
    void testAdd() {
        int result = add(2, 3);
        assertEquals(5, result);
    }

    private int add(int a, int b) {
        return a + b;
    }
}

---

numbers = [1, 2, 3]
total = sum(numbers)
print(total)

---

function add(a: number, b: number): number {
  return a + b;
}

const result = add(2, 3);
console.log(result);