Jest returns “Network Error” when doing an authenticated request with axios

Question

This seems a bit weird to me. I\'m trying to test an actual (ie. real network) request with Jest.

These are the tested scenarios:

• Test an external API (fix

Answer 1

Jest allows you to set a setup script file. This file will be required before everything else and gives you a chance to modify the environment in which the tests will run. This way you can unset XMLHttpRequest before axios is loaded and the adapter type evaluated since imports are hoisted. https://facebook.github.io/jest/docs/configuration.html#setuptestframeworkscriptfile-string

This worked for me:

package.json

{
  ...,
  "jest": {
    ...,
    "setupTestFrameworkScriptFile": "./__tests__/setup.js",
    ...
  },
  ...
}

__tests__/setup.js

global.XMLHttpRequest = undefined;