import { describe, expect, it } from 'bun:test'
import { formatBytes } from './format.ts'

describe('流量数字', () => {
  it('零和不满 1KB 的按字节显示，不带小数', () => {
    expect(formatBytes(0)).toBe('0 B')
    expect(formatBytes(512)).toBe('512 B')
    expect(formatBytes(1023)).toBe('1023 B')
  })

  it('1024 的边界正好换档', () => {
    expect(formatBytes(1024)).toBe('1 KB')
    expect(formatBytes(1024 * 1024)).toBe('1 MB')
  })

  it('不满 100 保留一位小数，够 100 取整', () => {
    expect(formatBytes(23.4 * 1024 * 1024)).toBe('23.4 MB')
    expect(formatBytes(234.7 * 1024 * 1024)).toBe('235 MB')
  })

  it('超大数停在 TB 档', () => {
    expect(formatBytes(5 * 1024 ** 4)).toBe('5 TB')
    expect(formatBytes(5000 * 1024 ** 4)).toBe('5000 TB')
  })

  it('脏输入不炸', () => {
    expect(formatBytes(-1)).toBe('0 B')
    expect(formatBytes(Number.NaN)).toBe('0 B')
  })
})