import {
  addMoney,
  compareMoney,
  formatMoney,
  isValidMoneyInput,
  moneyEquals,
  normalizeMoney,
  subtractMoney,
  sumMoney
} from '@/utils/budgetMoney'

describe('budget money', () => {
  it('normalizes and displays four decimals', () => {
    expect(normalizeMoney('12.34')).toBe('12.3400')
    expect(formatMoney('0.0001')).toBe('0.0001')
    expect(formatMoney(null)).toBe('0.0000')
  })

  it('calculates without binary floating point drift', () => {
    expect(addMoney('0.1000', '0.2000')).toBe('0.3000')
    expect(subtractMoney('1.0000', '0.9999')).toBe('0.0001')
    expect(sumMoney(['9999999999.9999', '0.0002'])).toBe('10000000000.0001')
    expect(moneyEquals('12.34', '12.3400')).toBe(true)
    expect(compareMoney('1.0000', '0.9999')).toBe(1)
  })

  it('rejects over-precision and out-of-range input', () => {
    expect(isValidMoneyInput('1.00001')).toBe(false)
    expect(isValidMoneyInput('100000000000.0000')).toBe(false)
    expect(isValidMoneyInput('1e3')).toBe(false)
    expect(() => normalizeMoney('1.00001')).toThrow()
  })
})