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+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+const { setTimeout } = require('sdk/timers');
+const utils = require('sdk/lang/functional');
+const { invoke, defer, curry, compose, memoize, once, delay, wrap } = utils;
+
+exports['test forwardApply'] = function(assert) {
+  function sum(b, c) this.a + b + c
+  assert.equal(invoke(sum, [2, 3], { a: 1 }), 6,
+               'passed arguments and pseoude-variable are used');
+
+  assert.equal(invoke(sum.bind({ a: 2 }), [2, 3], { a: 1 }), 7,
+               'bounded `this` pseoudo variable is used');
+}
+
+exports['test deferred function'] = function(assert, done) {
+  let nextTurn = false;
+  function sum(b, c) {
+    assert.ok(nextTurn, 'enqueued is called in next turn of event loop');
+    assert.equal(this.a + b + c, 6,
+                 'passed arguments an pseoude-variable are used');
+    done();
+  }
+
+  let fixture = { a: 1, method: defer(sum) }
+  fixture.method(2, 3);
+  nextTurn = true;
+};
+
+exports['test curry function'] = function(assert) {
+  function sum(b, c) this.a + b + c;
+
+  let foo = { a : 5 };
+
+  foo.sum7 = curry(sum, 7);
+  foo.sum8and4 = curry(sum, 8, 4);
+
+  assert.equal(foo.sum7(2), 14, 'curry one arguments works');
+
+  assert.equal(foo.sum8and4(), 17, 'curry both arguments works');
+};
+
+exports['test compose'] = function(assert) {
+  let greet = function(name) { return 'hi: ' + name; };
+  let exclaim = function(sentence) { return sentence + '!'; };
+
+  assert.equal(compose(exclaim, greet)('moe'), 'hi: moe!',
+               'can compose a function that takes another');
+
+  assert.equal(compose(greet, exclaim)('moe'), 'hi: moe!',
+               'in this case, the functions are also commutative');
+
+  let target = {
+    name: 'Joe',
+    greet: compose(function exclaim(sentence) {
+      return sentence + '!'
+    }, function(title) {
+      return 'hi : ' + title + ' ' + this.name;
+    })
+  }
+
+  assert.equal(target.greet('Mr'), 'hi : Mr Joe!',
+               'this can be passed in');
+  assert.equal(target.greet.call({ name: 'Alex' }, 'Dr'), 'hi : Dr Alex!',
+               'this can be applied');
+
+  let single = compose(function(value) {
+    return value + ':suffix';
+  });
+
+  assert.equal(single('text'), 'text:suffix', 'works with single function');
+
+  let identity = compose();
+  assert.equal(identity('bla'), 'bla', 'works with zero functions');
+};
+
+exports['test wrap'] = function(assert) {
+  let greet = function(name) { return 'hi: ' + name; };
+  let backwards = wrap(greet, function(f, name) {
+    return f(name) + ' ' + name.split('').reverse().join('');
+  });
+
+  assert.equal(backwards('moe'), 'hi: moe eom',
+               'wrapped the saluation function');
+
+  let inner = function () { return 'Hello '; };
+  let target = {
+    name: 'Matteo',
+    hi: wrap(inner, function(f) { return f() + this.name; })
+  };
+
+  assert.equal(target.hi(), 'Hello Matteo', 'works with this');
+
+  function noop() { };
+  let wrapped = wrap(noop, function(f) {
+    return Array.slice(arguments);
+  });
+
+  let actual = wrapped([ 'whats', 'your' ], 'vector', 'victor');
+  assert.deepEqual(actual, [ noop, ['whats', 'your'], 'vector', 'victor' ],
+                   'works with fancy stuff');
+};
+
+exports['test memoize'] = function(assert) {
+  function fib(n) n < 2 ? n : fib(n - 1) + fib(n - 2)
+  let fibnitro = memoize(fib);
+
+  assert.equal(fib(10), 55,
+        'a memoized version of fibonacci produces identical results');
+  assert.equal(fibnitro(10), 55,
+        'a memoized version of fibonacci produces identical results');
+
+  function o(key, value) { return value; };
+  let oo = memoize(o), v1 = {}, v2 = {};
+
+
+  assert.equal(oo(1, v1), v1, 'returns value back');
+  assert.equal(oo(1, v2), v1, 'memoized by a first argument');
+  assert.equal(oo(2, v2), v2, 'returns back value if not memoized');
+  assert.equal(oo(2), v2, 'memoized new value');
+  assert.notEqual(oo(1), oo(2), 'values do not override');
+  assert.equal(o(3, v2), oo(2, 3), 'returns same value as un-memoized');
+
+  let get = memoize(function(attribute) this[attribute])
+  let target = { name: 'Bob', get: get }
+
+  assert.equal(target.get('name'), 'Bob', 'has correct `this`');
+  assert.equal(target.get.call({ name: 'Jack' }, 'name'), 'Bob',
+               'name is memoized')
+  assert.equal(get('name'), 'Bob', 'once memoized can be called without this');
+};
+
+exports['test delay'] = function(assert, done) {
+  let delayed = false;
+  delay(function() {
+    assert.ok(delayed, 'delayed the function');
+    done();
+  }, 1);
+  delayed = true;
+};
+
+exports['test delay with this'] = function(assert, done) {
+  let context = {}
+  delay.call(context, function(name) {
+    assert.equal(this, context, 'this was passed in');
+    assert.equal(name, 'Tom', 'argument was passed in');
+    done();
+  }, 10, 'Tom');
+}
+
+exports['test once'] = function(assert) {
+  let n = 0;
+  let increment = once(function() { n ++; });
+
+  increment();
+  increment();
+
+  assert.equal(n, 1, 'only incremented once');
+
+  let target = { state: 0, update: once(function() this.state ++ ) };
+
+  target.update();
+  target.update();
+
+  assert.equal(target.state, 1, 'this was passed in and called only once');
+};
+
+require('test').run(exports);