app/tests/units/services/utils/fileUtils.test.ts

import { describe, test, it, expect } from 'vitest'
import FileUtils from '~/services/utils/fileUtils'
import 'blob-polyfill'

describe('newBlob', () => {
  test('defaultFiletype', async () => {
    const blob = FileUtils.newBlob('test')

    expect(await blob.text()).toEqual('test')
    expect(await blob.type).toEqual('image/jpeg')
  })

  test('otherFiletype', async () => {
    const blob = FileUtils.newBlob('test', 'image/png')

    expect(await blob.text()).toEqual('test')
    expect(await blob.type).toEqual('image/png')
  })
})

describe('blobToBase64', () => {
  test('simple blog', async () => {
    const blob = new Blob(['foo' as BlobPart], { type: 'image/jpeg' })

    expect(await FileUtils.blobToBase64(blob)).toEqual(
      'data:image/jpeg;base64,Zm9v',
    )
  })
})