Why Will Jest Not Run? "TypeError: environment.setup is not a function"

Question

really battling here.

My Circle CI tests have failed with a

FAIL  ./App.test.js
  ● Test suite failed to run

    SyntaxError: Unexpected token )

I try to run Jest locally on my machine (a CRNA one) but i get the following error:

TypeError: environment.setup is not a function

So both of these appear to be node version/ES6/babel issues, right?

I battled through some errors before (Path was expecting string etc), which i got round by install jest-cli and changing node versions etc.

i am now on: node v8.9.1 npm 5.5.1

But now i'm totally stumped.

So:

TypeError: environment.setup is not a function is specific to jest-cli package.

i've tried:

i) adding in the following to the jest config in pkg json:

  "jest": {
    "preset": "jest-expo",
    "testMatch": [
      "*.test.js",
      "**/?(*.)(spec|test).js?(x)"
    ],
    "transformIgnorePatterns": [
      "node_modules/(?!(react-native|jest-cli)/)"
    ]
  }

(thought this might 'babel' the module, but alas no change in error msg)

ii) Changing versions of babel-core, installing babel-node-modules, changing versions of React Native, jest etc etc. No joy.

Help?

Is there something i'm missing in terms of getting a Create React Native App project to run jest tests on node v5-v8?

Proper stumped and it's holding up getting my Circle CI set-up.

Send help or some sort of IPA ale to sooth my frustration. 😒

Answer 1

I ended up getting this working by:

i) installing babel-jest

ii) babel-preset-react-native (instead of the stage-0 module)

iii) changing the test script to just test: jest

iv) removing env variable from .babelrc (so it's just "presets": ["react-native"] now)

v) changing my config.yml to a circle.yml (this got rid of a node version error)

vi) nuking node_modules, full npm install (/yarn)

vii) moved my App.test.js out of the root and into its own __tests__/App.test.js folder/location.

I think babel-jest was the main crux of it, but even then I was getting propTypes not found errors and had to check my peer dependencies, some of which needed updating past the beta versions of things I had been using.

My package json:

{
  "name": "MyAppName",
  "jest": {
    "preset": "react-native"
  },
  "version": "0.1.0",
  "private": true,
  "devDependencies": {
    "babel-eslint": "^8.0.1",
    "babel-jest": "21.2.0",
    "babel-preset-react-native": "4.0.0",
    "babel-plugin-module-resolver": "^3.0.0",
    "enzyme": "^3.2.0",
    "enzyme-adapter-react-16": "^1.1.0",
    "eslint": "^4.9.0",
    "eslint-plugin-import": "^2.8.0",
    "eslint-plugin-promise": "^3.6.0",
    "eslint-plugin-react": "^7.4.0",
    "flow-bin": "0.53.1",
    "jest": "^21.2.1",
    "react-dom": "^16.2.0",
    "react-test-renderer": "16.2.0",
    "sinon": "^4.1.3"
  },
  "scripts": {
    "start": "react-native start",
    "android": "react-native run-android",
    "ios": "react-native run-ios",
    "test": "jest"
  },
  "dependencies": {
    "jest-cli": "^21.2.1",
    "react": "16.2.0",
    "react-native": "^0.51.0"
  }
}