stubbing

config.coffee

module.exports = 
  env: process.env.NODE_ENV ? 'development'

model.coffee

config = require './config'

module.exports.foo = () -> 
  "We're in #{config.env} environment"

test.coffee

config = require './config'

assert config.env, 'development'  # true

model = require './model'

assert "We're in development environment", model.foo() #true

config.env = 'production'

assert "We're in production environment", model.foo() #true