areacode-to-zipcode/tests/getZipcodeFromAreaCode.test.ts

Translate area codes to zip codes. A utility for looking up postal codes in the US.

import { getZipcodeFromAreaCode } from "..";

test('gets zipcode from areacode', () => {
    const result = getZipcodeFromAreaCode(212);
    expect(result).toBe("10024");
});

test('gets zipcode from toll-free areacode', () => {
    const result = getZipcodeFromAreaCode(887);
    expect(result).toBe(null);
});

test('zipcode does not exist', () => {
    const result = getZipcodeFromAreaCode(911);
    expect(result).toEqual(null);
});