// custom-test-phase1.js
const parserTest = () => {
    try {
        const result = sum('1,2');
        if (result === 3) {
            console.log('parserTest example 1 PASSED');
        } else {
            throw new Error(`parserTest: expected 3 but was ${result}`);
        }
    } catch (e) {
        console.error(e.stack);
    }
};