file-commons/src/utilities/Blob.test.ts

import * as fc from 'fast-check'
import Blob from './Blob'

jest.mock('./isBrowser', function IsBrowser() {
  return () => false
})

it('should exist', () => {
  expect(Blob).toBeDefined()
})

it('should be a callable', () => {
  expect(typeof Blob).toBe('function')
})

describe('instances', () => {
  it('should contain a type', () => {
    fc.assert(
      fc.property(
        fc.tuple(
          fc.oneof(
            fc.constant('application'),
            fc.constant('font'),
            fc.constant('audio'),
            fc.constant('model'),
            fc.constant('video'),
            fc.constant('text')
          ),
          fc.string().filter(s => /^[a-zA-Z0-9._-]+$/.test(s))
        ),
        mimeTypeFragments => {
          const file = new Blob([], { type: mimeTypeFragments.join('/') })
          expect(file).toHaveProperty('type', mimeTypeFragments.join('/').toLowerCase())
        }
      )
    )
  })
})