// custom-test-phase3.js
const assertEquals = (expected, actual) => {
    if (actual !== expected) {
        throw new Error(`Expected ${expected} but was ${actual}`);
    }
};

const check = (name, implementation) => {
    try {
        implementation();
        console.log(`${name} passed`);
    } catch (e) {
        console.error(`${name} FAILED`, e.stack);
    }
};

check('sum with 2 numbers should sum them up', () => {
    const result = sum('1,2');
    assertEquals(3, result);
});

check('sum with multiple digit numbers should sum them up', () => {
    const result = sum('10,20');
    assertEquals(30, result);
});