import assert from 'node:assert'
import { describe, it } from 'node:test'
import prettierBytes from './prettierBytes'

const testData = [
  [2, '2 B'],
  [9, '9 B'],
  [25, '25 B'],
  [235, '235 B'],
  [2335, '2.3 KB'],
  [23552, '23 KB'],
  [235520, '230 KB'],
  [2355520, '2.2 MB'],
  [23555520, '22 MB'],
  [235555520, '225 MB'],
  [2355555520, '2.2 GB'],
  [23555555520, '22 GB'],
  [235556555520, '219 GB'],
  [2355556655520, '2.1 TB'],
  [23555566655520, '21 TB'],
  [235555566665520, '214 TB'],
] satisfies [input: number, output: string][]

describe('prettierBytes', () => {
  it('should convert the specified number of bytes to a human-readable string like 236 MB', () => {
    for (const [input, expected] of testData) {
      assert.strictEqual(prettierBytes(input), expected)
    }
  })

  it('throws on non-number', () => {
    assert.throws(() => {
      // @ts-expect-error - testing invalid input
      prettierBytes('this is a string')
    })
  })

  it('throws on NaN', () => {
    assert.throws(() => {
      prettierBytes(Number.NaN)
    })
  })
})