message: Test `GaiaHubError` values
diff: @@ -13,6 +13,7 @@ import { getFile, getFileUrl, putFile, listFiles, deleteFile } from '../../../sr
  import { getPublicKeyFromPrivate } from '../../../src/keys'
  import { UserSession, AppConfig } from '../../../src'
  +import { DoesNotExist } from '../../../src/errors';
  // class LocalStorage {
  // constructor() {
  @@ -924,7 +925,7 @@ export function runStorageTests() {
  })
  test('getFile throw on 404', (t) => {
  - t.plan(2)
  + t.plan(3)
  const config = {
  address: '19MoWG8u88L6t766j7Vne21Mg4wHsCQ7vk',
  url_prefix: 'gaia.testblockstack.org/hub/',
  @@ -951,7 +952,11 @@ export function runStorageTests() {
  const optionsDecrypt = { decrypt: true }
  getFile('foo.json', optionsDecrypt, blockstack)
  .then(() => t.fail('getFile (decrypt) with 404 should fail'))
  - .catch(() => t.pass('getFile (decrypt) with 404 should fail'))
  + .catch((err) => {
  + t.ok(err instanceof DoesNotExist, "DoesNotExist error thrown")
  + t.equal(err.hubError.statusCode, 404)
  + t.equal(err.hubError.statusText, 'Not Found')
  + })
  })
  test('uploadToGaiaHub', (t) => {
  