Add npm script test:fetch-private

Author: sequba

package.json

@@ -75,6 +75,7 @@
     "verify:cjs": "node script/check-file.js commonjs",
     "verify:publish-package": "npm pack | node script/check-publish-package.js",
     "verify:typings": "tsc --noEmit",
+    "test:fetch-private": "bash test/fetch-tests.sh",
     "test": "npm-run-all lint test:jest test:browser",
     "test:jest": "cross-env NODE_ICU_DATA=node_modules/full-icu jest",
     "test:ci": "cross-env NODE_ICU_DATA=node_modules/full-icu node --expose-gc ./node_modules/jest/bin/jest --forceExit",