message: Add 'yarn check --integrity' to test script
diff: "precommit": "npm run testonly && lint-staged",
  "prepublish": ". ./resources/prepublish.sh",
  "preversion": ". ./resources/checkgit.sh && npm test",
  - "test": "npm run lint && npm run check && npm run testonly && npm run build",
  + "test": "yarn check --integrity && npm run lint && npm run check && npm run testonly && npm run build",
  "testonly": "babel-node ./node_modules/.bin/_mocha $npm_package_options_mocha"
  },
  "lint-staged": {
  