serialport-v5/node_modules/rc/test/test.js

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var n = 'rc'+Math.random()
var assert = require('assert')

process.env[n+'_envOption'] = 42

var config = require('../')(n, {
  option: true
})

console.log(config)

assert.equal(config.option, true)
assert.equal(config.envOption, 42)

var customArgv = require('../')(n, {
  option: true
}, { // nopt-like argv
  option: false,
  envOption: 24,
  argv: {
    remain: [],
    cooked: ['--no-option', '--envOption', '24'],
    original: ['--no-option', '--envOption=24']
  }
})

console.log(customArgv)

assert.equal(customArgv.option, false)
assert.equal(customArgv.envOption, 24)

var fs = require('fs')
var path = require('path')
var jsonrc = path.resolve('.' + n + 'rc');

fs.writeFileSync(jsonrc, [
  '{',
    '// json overrides default',
    '"option": false,',
    '/* env overrides json */',
    '"envOption": 24',
  '}'
].join('\n'));

var commentedJSON = require('../')(n, {
  option: true
})

fs.unlinkSync(jsonrc);

console.log(commentedJSON)

assert.equal(commentedJSON.option, false)
assert.equal(commentedJSON.envOption, 42)

assert.equal(commentedJSON.config, jsonrc)
assert.equal(commentedJSON.configs.length, 1)
assert.equal(commentedJSON.configs[0], jsonrc)