How do I set the default test command for `npm init`?

I know I can do:

npm config set init.author.email me@mycompany.com
npm config set init.license UNLICENSED

To set the defaults used to create a new package.json with npm init. But how can I set the default value for the test command? I've tried

npm config set init.scripts.test "mocha"

But it doesn't work. The npm docs don't seem to help.

Is there a list of all the init defaults?

There is a list of all config defaults npm config list -l.

As you can see there isn't anything like init.scripts. But there is another way to do it. If you first npm install mocha and then npm init you will get a package.json like:

{
  "name": "asd",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "dependencies": {},
  "devDependencies": {
    "mocha": "^2.4.5"
  },
  "scripts": {
    "test": "mocha"
  },
  "author": "",
  "license": "UNLICENSED"
}