nodejs/deps/npm/test/lib/load-all-commands.js

// Thanks to nyc not working properly with proxies this doesn't affect
// coverage. but it does ensure that every command has a usage that renders,
// contains its name, a description, and if it has completion it is a function.
// That it renders also ensures that any params we've defined in our commands
// work.
const requireInject = require('require-inject')
const npm = requireInject('../../lib/npm.js')
const t = require('tap')
const { cmdList } = require('../../lib/utils/cmd-list.js')

let npmOutput = []
npm.output = (msg) => {
  npmOutput = msg
}
t.test('load each command', t => {
  t.plan(cmdList.length + 1)
  npm.load((er) => {
    t.notOk(er)
    npm.config.set('usage', true)
    for (const cmd of cmdList.sort((a, b) => a.localeCompare(b))) {
      t.test(cmd, t => {
        const impl = npm.commands[cmd]
        if (impl.completion)
          t.isa(impl.completion, 'function', 'completion, if present, is a function')
        t.isa(impl, 'function', 'implementation is a function')
        t.ok(impl.description, 'implementation has a description')
        t.ok(impl.name, 'implementation has a name')
        t.match(impl.usage, cmd, 'usage contains the command')
        impl([], (err) => {
          t.notOk(err)
          t.match(npmOutput, impl.usage, 'usage is output')
          t.end()
        })
      })
    }
  })
})