@joshrtay/decache/test/test.js

decache (Delete Cache) lets you delete modules from node.js require() cache; useful for dev servers

// awesome tests here!
var test = require('tape') // the reliable testing framework
var decache = require('..')
var mymodule = require('./modules/mymodule')
var assert = require('assert')

test('Expect decache to do nothing if the module name does not exist', function (t) {
  try {
    decache('./non-existing-module')
    t.pass('No error thrown')
    t.end()
  } catch (e) {
    t.fail('This should have not throw an error')
    t.end()
  }
})

test('Expect mymodule.count initial state to be false', function (t) {
  t.equal(mymodule.get(), false, 'count is false! (we have not run this)')
  t.end()
})

test('Increment the value of the count so its 1 (one)', function (t) {
  var runcount = mymodule.set()
  t.equal(runcount, 1, 'runcount is one! (as expected)')
  t.end()
})

test('Increment the value of the count so its 2 (one)', function (t) {
  mymodule.set()
  var runcount = mymodule.get()
  t.equal(runcount, 2, 'runcount is 2!')
  t.end()
})

test('There\'s no going back to initial (runcount) state!', function (t) {
  var runcount = mymodule.get()
  t.equal(runcount, 2, 'runcount cannot be decremented!!')
  t.end()
})

test('Delete Require Cache for mymodule to re-set the runcount!', function (t) {
  decache('./modules/mymodule') // exercise the decache module
  require('./modules/othermodule.js')
  decache('./modules/othermodule.js')
  mymodule = require('./modules/mymodule')
  var runcount = mymodule.get()
  t.equal(runcount, false, 'runcount is false! (as epxected)')
  t.end()
})

test('Require an npm (non local) module', function (t) {
  require('tap-spec')
  decache('tap-spec')
  var keys = Object.keys(require.cache)
  t.equal(keys.indexOf('tap-spec'), -1, 'tap-spec no longer in require-cache')
  t.end()
})

test('Require a module with a binary', function (t) {
  require('farmhash')
  assert.doesNotThrow(_ => {
    decache('farmhash')
    require('farmhash')
  })
  t.end()
})

test('Fake relative parent module', function (t) {
  var keys = Object.keys(require.cache)
  var p = keys[0] // the module that required decache
  var obj = require.cache[p]
  require.cache = {}
  require.cache[__filename] = obj
  var other = require('./modules/othermodule.js')
  decache('./modules/othermodule.js')
  keys = Object.keys(require.cache)
  t.equal(other(), 'hello')
  t.equal(keys.indexOf('othermodule.js'), -1, 'fake parent not in require.cache')
  t.end()
})