formatCurrency.spec.ts
1,070 bytes
| 1 | import { describe, it, expect } from 'vitest' |
|---|---|
| 2 | import { formatCurrency } from '@/utils/formatCurrency' |
| 3 | |
| 4 | describe('formatCurrency', () => { |
| 5 | it('formats a positive number with default 2 decimals and no symbol', () => { |
| 6 | expect(formatCurrency(1234.5)).toBe('1,234.50') |
| 7 | }) |
| 8 | |
| 9 | it('prefixes the currency symbol when provided', () => { |
| 10 | expect(formatCurrency(99.5, '€')).toBe('€99.50') |
| 11 | expect(formatCurrency(10, '$')).toBe('$10.00') |
| 12 | }) |
| 13 | |
| 14 | it('handles zero', () => { |
| 15 | expect(formatCurrency(0, '€')).toBe('€0.00') |
| 16 | }) |
| 17 | |
| 18 | it('handles negative numbers — sign goes before the symbol', () => { |
| 19 | expect(formatCurrency(-42.5, '€')).toBe('-€42.50') |
| 20 | }) |
| 21 | |
| 22 | it('respects custom decimal count', () => { |
| 23 | expect(formatCurrency(10, '$', 0)).toBe('$10') |
| 24 | expect(formatCurrency(10.12345, '$', 4)).toBe('$10.1235') |
| 25 | }) |
| 26 | |
| 27 | it('ignores null symbol', () => { |
| 28 | expect(formatCurrency(5.25, null)).toBe('5.25') |
| 29 | }) |
| 30 | |
| 31 | it('uses thousands separators for large amounts', () => { |
| 32 | expect(formatCurrency(1_234_567.89, '$')).toBe('$1,234,567.89') |
| 33 | }) |
| 34 | }) |
| 35 | |