Error during test about react-rendering-lab-v-000

[pbortnick]

Potential fix is editing package.json to look like this:

{
  "name": "react-component-mounting-and-unmounting-lab",
  "version": "0.1.0",
  "private": true,
  "devDependencies": {
    "enzyme": "^2.7.0",
    "jsdom": "^9.9.1",
    "mocha": "^3.2.0",
    "react-scripts": "^1.0.7",
    "react-test-renderer": "^15.6.2",
    "webpack": "^2.2.0",
    "webpack-dev-server": "^1.16.2"
  },
  "dependencies": {
    "babel-core": "^6.22.1",
    "babel-loader": "^7.1.2",
    "babel-preset-airbnb": "^2.1.1",
    "babel-preset-env": "^1.6.0",
    "babel-preset-es2015": "^6.22.0",
    "babel-preset-react": "^6.22.0",
    "babel-preset-stage-0": "^6.22.0",
    "chai": "^3.5.0",
    "expect": "^21.2.1",
    "mocha-multi": "^1.0.0",
    "react": "^15.6.2",
    "react-dom": "^15.6.2",
    "sinon": "^1.17.7"
  },
  "scripts": {
    "start": "react-scripts start",
    "build": "react-scripts build",
    "test": "mocha -w test/helpers.js test/*.js",
    "dev:hot": "webpack-dev-server --hot --inline --progress --colors --watch --display-error-details --display-cached --content-base ./",
    "test:watch": "npm run test -- --watch",
    "eject": "react-scripts eject"
  }
}