01d6ff3fa3
Restructure tests into __tests__/ directories at package root so they can be excluded from production builds. Add unit tests for dates, currency, lookup service, payment method default logic, and tax exemption state transitions.
69 lines
1.7 KiB
TypeScript
69 lines
1.7 KiB
TypeScript
import { describe, it, expect } from 'bun:test'
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import { formatCurrency, roundCurrency, toCents, toDollars } from '../../src/utils/currency.js'
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describe('formatCurrency', () => {
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it('formats whole dollars', () => {
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expect(formatCurrency(100)).toBe('$100.00')
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})
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it('formats cents', () => {
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expect(formatCurrency(49.99)).toBe('$49.99')
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})
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it('formats zero', () => {
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expect(formatCurrency(0)).toBe('$0.00')
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})
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it('formats thousands with comma', () => {
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expect(formatCurrency(1234.56)).toBe('$1,234.56')
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})
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it('formats negative amounts', () => {
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expect(formatCurrency(-25.50)).toBe('-$25.50')
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})
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})
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describe('roundCurrency', () => {
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it('rounds to 2 decimal places', () => {
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expect(roundCurrency(1.005)).toBe(1.01)
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expect(roundCurrency(1.004)).toBe(1)
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})
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it('handles already-rounded values', () => {
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expect(roundCurrency(10.50)).toBe(10.50)
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})
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it('handles zero', () => {
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expect(roundCurrency(0)).toBe(0)
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})
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})
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describe('toCents', () => {
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it('converts dollars to cents', () => {
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expect(toCents(1.00)).toBe(100)
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expect(toCents(49.99)).toBe(4999)
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})
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it('rounds fractional cents', () => {
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// 1.005 * 100 = 100.49999... in IEEE 754, so Math.round gives 100
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// This is a known floating point limitation — use toCents(roundCurrency(x)) for precision
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expect(toCents(1.005)).toBe(100)
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expect(toCents(1.006)).toBe(101)
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})
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it('handles zero', () => {
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expect(toCents(0)).toBe(0)
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})
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})
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describe('toDollars', () => {
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it('converts cents to dollars', () => {
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expect(toDollars(100)).toBe(1.00)
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expect(toDollars(4999)).toBe(49.99)
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})
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it('handles zero', () => {
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expect(toDollars(0)).toBe(0)
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})
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})
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