[Tests] use pretest to run the linter

Author: ljharb

package.json

@@ -7,7 +7,8 @@
   "scripts": {
     "coveralls": "cat ./reports/coverage/lcov.info | coveralls",
     "lint": "eslint ./",
-    "test": "npm run lint && npm run unit-test",
+    "pretest": "npm run lint",
+    "test": "npm run unit-test",
     "unit-test": "istanbul cover --dir reports/coverage node_modules/mocha/bin/_mocha tests/**/*.js -- --reporter dot"
   },
   "files": [