fix unit

Author: timfish

packages/bundler-plugin-core/package.json

@@ -48,6 +48,7 @@
     "clean:all": "run-p clean clean:deps",
     "clean:build": "premove ./dist *.tgz",
     "clean:deps": "premove node_modules",
+    "pretest": "yarn prebuild",
     "test": "jest",
     "lint": "eslint ./src ./test",
     "fix": "eslint ./src ./test --format stylish --fix"