Unwire

Dependency injection for Node.js

Install

npm install unwire

Example Usage

config.js

The file that uses a dependency you want to mock

const fs = require('fs')

function readConfig () {
  return fs.readFileSync('./config.json')
}

module.exports = readConfig

test.js

Testing config.js but mocking the fs module

const assert = require('assert')
const { mock } = require('unwire')

const mockFs = (config) => ({
  readFileSync: () => config,
})

// force fs.readFileSync to read our expected config
const expectedConfig = 'CONFIG'
mock('fs', mockFs(expectedConfig))

// load config.js - it will use the mocked fs object
const readConfig = require('./config.js')

const config = readConfig()
assert.equal(config, expectedConfig)

API

mock(modulePath, mock)

replace(modulePath, value)

flush(modulePath)

mockWithContext(modulePath, context, mock)

replaceWithContext(modulePath, context, value)

flushWithContext(modulePath, context)

flushAllModules()

resolveModulePath(modulePath, context)

License

The MIT License (MIT)

Copyright (c) 2014 George Czabania

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.