npm scripts and zsh extended globbing - http://blog.fgribreau.com/2015/01/npm-scripts-and-zsh-extended-globbing.html

problem.sh

$ cat package.json | grep "test"
    "test": "mocha -t 5000 -R spec **/*.test.js~node_modules/*",
  
$ npm test
> mocha -t 5000 -R spec **/*.test.js~node_modules/*

/www/statwarn-monitoring-api/node_modules/mocha/lib/utils.js:494
      if (!files.length) throw new Error("cannot resolve path (or pattern) '"
                               ^
Error: cannot resolve path (or pattern) '**/*.test.js~node_modules/*'