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node_modules/reusify/test.js

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+'use strict'
+
+var test = require('tape')
+var reusify = require('./')
+
+test('reuse objects', function (t) {
+  t.plan(6)
+
+  function MyObject () {
+    t.pass('constructor called')
+    this.next = null
+  }
+
+  var instance = reusify(MyObject)
+  var obj = instance.get()
+
+  t.notEqual(obj, instance.get(), 'two instance created')
+  t.notOk(obj.next, 'next must be null')
+
+  instance.release(obj)
+
+  // the internals keeps a hot copy ready for reuse
+  // putting this one back in the queue
+  instance.release(instance.get())
+
+  // comparing the old one with the one we got
+  // never do this in real code, after release you
+  // should never reuse that instance
+  t.equal(obj, instance.get(), 'instance must be reused')
+})
+
+test('reuse more than 2 objects', function (t) {
+  function MyObject () {
+    t.pass('constructor called')
+    this.next = null
+  }
+
+  var instance = reusify(MyObject)
+  var obj = instance.get()
+  var obj2 = instance.get()
+  var obj3 = instance.get()
+
+  t.notOk(obj.next, 'next must be null')
+  t.notOk(obj2.next, 'next must be null')
+  t.notOk(obj3.next, 'next must be null')
+
+  t.notEqual(obj, obj2)
+  t.notEqual(obj, obj3)
+  t.notEqual(obj3, obj2)
+
+  instance.release(obj)
+  instance.release(obj2)
+  instance.release(obj3)
+
+  // skip one
+  instance.get()
+
+  var obj4 = instance.get()
+  var obj5 = instance.get()
+  var obj6 = instance.get()
+
+  t.equal(obj4, obj)
+  t.equal(obj5, obj2)
+  t.equal(obj6, obj3)
+  t.end()
+})