frontend/__tests__/formatMoney.test.js


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import formatMoney from '../lib/formatMoney';

describe('formatMoney', () => {
  it('works with fractional dollars', () => {
    expect(formatMoney(1)).toEqual('$0.01');
    expect(formatMoney(10)).toEqual('$0.10');
  });

  it('leaves cents off for whole dollars', () => {
    expect(formatMoney(5000)).toEqual('$50');
    expect(formatMoney(100)).toEqual('$1');
    expect(formatMoney(50000000)).toEqual('$500,000');
  });

  it('works with whole and fractional dollars', () => {
    expect(formatMoney(5012)).toEqual('$50.12');
    expect(formatMoney(101)).toEqual('$1.01');
    expect(formatMoney(110)).toEqual('$1.10');
    expect(formatMoney(54345345)).toEqual('$543,453.45');
  });
});