--- /dev/null
+
+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)