TypeError when mocking request with jest

Question

I'm relatively new to node and am having issues trying to mock request using jest.

If my file to be tested has require('request'), and I try to run npm test, I get this error:

FAIL  __tests__/sum-test.js (0.291s)
● sum › it adds 1 + 2 to equal 3
  - TypeError: The super constructor to `inherits` must have a prototype.
        at Object.exports.inherits (util.js:756:11)
        at Object.<anonymous> (node_modules/request/node_modules/http-signature/node_modules/sshpk/lib/private-key.js:44:6)
        at Object.<anonymous> (node_modules/request/node_modules/http-signature/node_modules/sshpk/lib/utils.js:16:18)

Here's my package.json, if that helps:

{
  "name": "jesttest",
  "version": "1.0.0",
  "scripts": {
    "test": "jest"
  },
  "devDependencies": {
    "jest-cli": "^12.0.2"
  },
  "dependencies": {
    "request": "^2.72.0"
  }
}

Anyone know why this might be happening?

Answer 1

add jest.unmock('request') in your test file.

Jest will mock a fake require object when you require something in your file.In this situation, request is not the real request.So tell jext not mock request.