--- /dev/null
+(function() {
+ var _ = typeof require == 'function' ? require('..') : window._;
+
+ QUnit.module('Functions');
+ QUnit.config.asyncRetries = 3;
+
+ QUnit.test('bind', function(assert) {
+ var context = {name: 'moe'};
+ var func = function(arg) { return 'name: ' + (this.name || arg); };
+ var bound = _.bind(func, context);
+ assert.equal(bound(), 'name: moe', 'can bind a function to a context');
+
+ bound = _(func).bind(context);
+ assert.equal(bound(), 'name: moe', 'can do OO-style binding');
+
+ bound = _.bind(func, null, 'curly');
+ var result = bound();
+ // Work around a PhantomJS bug when applying a function with null|undefined.
+ assert.ok(result === 'name: curly' || result === 'name: ' + window.name, 'can bind without specifying a context');
+
+ func = function(salutation, name) { return salutation + ': ' + name; };
+ func = _.bind(func, this, 'hello');
+ assert.equal(func('moe'), 'hello: moe', 'the function was partially applied in advance');
+
+ func = _.bind(func, this, 'curly');
+ assert.equal(func(), 'hello: curly', 'the function was completely applied in advance');
+
+ func = function(salutation, firstname, lastname) { return salutation + ': ' + firstname + ' ' + lastname; };
+ func = _.bind(func, this, 'hello', 'moe', 'curly');
+ assert.equal(func(), 'hello: moe curly', 'the function was partially applied in advance and can accept multiple arguments');
+
+ func = function(ctx, message) { assert.equal(this, ctx, message); };
+ _.bind(func, 0, 0, 'can bind a function to `0`')();
+ _.bind(func, '', '', 'can bind a function to an empty string')();
+ _.bind(func, false, false, 'can bind a function to `false`')();
+
+ // These tests are only meaningful when using a browser without a native bind function
+ // To test this with a modern browser, set underscore's nativeBind to undefined
+ var F = function() { return this; };
+ var boundf = _.bind(F, {hello: 'moe curly'});
+ var Boundf = boundf; // make eslint happy.
+ var newBoundf = new Boundf();
+ assert.equal(newBoundf.hello, void 0, 'function should not be bound to the context, to comply with ECMAScript 5');
+ assert.equal(boundf().hello, 'moe curly', "When called without the new operator, it's OK to be bound to the context");
+ assert.ok(newBoundf instanceof F, 'a bound instance is an instance of the original function');
+
+ assert.raises(function() { _.bind('notafunction'); }, TypeError, 'throws an error when binding to a non-function');
+ });
+
+ QUnit.test('partial', function(assert) {
+ var obj = {name: 'moe'};
+ var func = function() { return this.name + ' ' + _.toArray(arguments).join(' '); };
+
+ obj.func = _.partial(func, 'a', 'b');
+ assert.equal(obj.func('c', 'd'), 'moe a b c d', 'can partially apply');
+
+ obj.func = _.partial(func, _, 'b', _, 'd');
+ assert.equal(obj.func('a', 'c'), 'moe a b c d', 'can partially apply with placeholders');
+
+ func = _.partial(function() { return arguments.length; }, _, 'b', _, 'd');
+ assert.equal(func('a', 'c', 'e'), 5, 'accepts more arguments than the number of placeholders');
+ assert.equal(func('a'), 4, 'accepts fewer arguments than the number of placeholders');
+
+ func = _.partial(function() { return typeof arguments[2]; }, _, 'b', _, 'd');
+ assert.equal(func('a'), 'undefined', 'unfilled placeholders are undefined');
+
+ // passes context
+ function MyWidget(name, options) {
+ this.name = name;
+ this.options = options;
+ }
+ MyWidget.prototype.get = function() {
+ return this.name;
+ };
+ var MyWidgetWithCoolOpts = _.partial(MyWidget, _, {a: 1});
+ var widget = new MyWidgetWithCoolOpts('foo');
+ assert.ok(widget instanceof MyWidget, 'Can partially bind a constructor');
+ assert.equal(widget.get(), 'foo', 'keeps prototype');
+ assert.deepEqual(widget.options, {a: 1});
+
+ _.partial.placeholder = obj;
+ func = _.partial(function() { return arguments.length; }, obj, 'b', obj, 'd');
+ assert.equal(func('a'), 4, 'allows the placeholder to be swapped out');
+
+ _.partial.placeholder = {};
+ func = _.partial(function() { return arguments.length; }, obj, 'b', obj, 'd');
+ assert.equal(func('a'), 5, 'swapping the placeholder preserves previously bound arguments');
+
+ _.partial.placeholder = _;
+ });
+
+ QUnit.test('bindAll', function(assert) {
+ var curly = {name: 'curly'};
+ var moe = {
+ name: 'moe',
+ getName: function() { return 'name: ' + this.name; },
+ sayHi: function() { return 'hi: ' + this.name; }
+ };
+ curly.getName = moe.getName;
+ _.bindAll(moe, 'getName', 'sayHi');
+ curly.sayHi = moe.sayHi;
+ assert.equal(curly.getName(), 'name: curly', 'unbound function is bound to current object');
+ assert.equal(curly.sayHi(), 'hi: moe', 'bound function is still bound to original object');
+
+ curly = {name: 'curly'};
+ moe = {
+ name: 'moe',
+ getName: function() { return 'name: ' + this.name; },
+ sayHi: function() { return 'hi: ' + this.name; },
+ sayLast: function() { return this.sayHi(_.last(arguments)); }
+ };
+
+ assert.raises(function() { _.bindAll(moe); }, Error, 'throws an error for bindAll with no functions named');
+ assert.raises(function() { _.bindAll(moe, 'sayBye'); }, TypeError, 'throws an error for bindAll if the given key is undefined');
+ assert.raises(function() { _.bindAll(moe, 'name'); }, TypeError, 'throws an error for bindAll if the given key is not a function');
+
+ _.bindAll(moe, 'sayHi', 'sayLast');
+ curly.sayHi = moe.sayHi;
+ assert.equal(curly.sayHi(), 'hi: moe');
+
+ var sayLast = moe.sayLast;
+ assert.equal(sayLast(1, 2, 3, 4, 5, 6, 7, 'Tom'), 'hi: moe', 'createCallback works with any number of arguments');
+
+ _.bindAll(moe, ['getName']);
+ var getName = moe.getName;
+ assert.equal(getName(), 'name: moe', 'flattens arguments into a single list');
+ });
+
+ QUnit.test('memoize', function(assert) {
+ var fib = function(n) {
+ return n < 2 ? n : fib(n - 1) + fib(n - 2);
+ };
+ assert.equal(fib(10), 55, 'a memoized version of fibonacci produces identical results');
+ fib = _.memoize(fib); // Redefine `fib` for memoization
+ assert.equal(fib(10), 55, 'a memoized version of fibonacci produces identical results');
+
+ var o = function(str) {
+ return str;
+ };
+ var fastO = _.memoize(o);
+ assert.equal(o('toString'), 'toString', 'checks hasOwnProperty');
+ assert.equal(fastO('toString'), 'toString', 'checks hasOwnProperty');
+
+ // Expose the cache.
+ var upper = _.memoize(function(s) {
+ return s.toUpperCase();
+ });
+ assert.equal(upper('foo'), 'FOO');
+ assert.equal(upper('bar'), 'BAR');
+ assert.deepEqual(upper.cache, {foo: 'FOO', bar: 'BAR'});
+ upper.cache = {foo: 'BAR', bar: 'FOO'};
+ assert.equal(upper('foo'), 'BAR');
+ assert.equal(upper('bar'), 'FOO');
+
+ var hashed = _.memoize(function(key) {
+ //https://github.com/jashkenas/underscore/pull/1679#discussion_r13736209
+ assert.ok(/[a-z]+/.test(key), 'hasher doesn\'t change keys');
+ return key;
+ }, function(key) {
+ return key.toUpperCase();
+ });
+ hashed('yep');
+ assert.deepEqual(hashed.cache, {YEP: 'yep'}, 'takes a hasher');
+
+ // Test that the hash function can be used to swizzle the key.
+ var objCacher = _.memoize(function(value, key) {
+ return {key: key, value: value};
+ }, function(value, key) {
+ return key;
+ });
+ var myObj = objCacher('a', 'alpha');
+ var myObjAlias = objCacher('b', 'alpha');
+ assert.notStrictEqual(myObj, void 0, 'object is created if second argument used as key');
+ assert.strictEqual(myObj, myObjAlias, 'object is cached if second argument used as key');
+ assert.strictEqual(myObj.value, 'a', 'object is not modified if second argument used as key');
+ });
+
+ QUnit.test('delay', function(assert) {
+ assert.expect(2);
+ var done = assert.async();
+ var delayed = false;
+ _.delay(function(){ delayed = true; }, 100);
+ setTimeout(function(){ assert.ok(!delayed, "didn't delay the function quite yet"); }, 50);
+ setTimeout(function(){ assert.ok(delayed, 'delayed the function'); done(); }, 150);
+ });
+
+ QUnit.test('defer', function(assert) {
+ assert.expect(1);
+ var done = assert.async();
+ var deferred = false;
+ _.defer(function(bool){ deferred = bool; }, true);
+ _.delay(function(){ assert.ok(deferred, 'deferred the function'); done(); }, 50);
+ });
+
+ QUnit.test('throttle', function(assert) {
+ assert.expect(2);
+ var done = assert.async();
+ var counter = 0;
+ var incr = function(){ counter++; };
+ var throttledIncr = _.throttle(incr, 32);
+ throttledIncr(); throttledIncr();
+
+ assert.equal(counter, 1, 'incr was called immediately');
+ _.delay(function(){ assert.equal(counter, 2, 'incr was throttled'); done(); }, 64);
+ });
+
+ QUnit.test('throttle arguments', function(assert) {
+ assert.expect(2);
+ var done = assert.async();
+ var value = 0;
+ var update = function(val){ value = val; };
+ var throttledUpdate = _.throttle(update, 32);
+ throttledUpdate(1); throttledUpdate(2);
+ _.delay(function(){ throttledUpdate(3); }, 64);
+ assert.equal(value, 1, 'updated to latest value');
+ _.delay(function(){ assert.equal(value, 3, 'updated to latest value'); done(); }, 96);
+ });
+
+ QUnit.test('throttle once', function(assert) {
+ assert.expect(2);
+ var done = assert.async();
+ var counter = 0;
+ var incr = function(){ return ++counter; };
+ var throttledIncr = _.throttle(incr, 32);
+ var result = throttledIncr();
+ _.delay(function(){
+ assert.equal(result, 1, 'throttled functions return their value');
+ assert.equal(counter, 1, 'incr was called once'); done();
+ }, 64);
+ });
+
+ QUnit.test('throttle twice', function(assert) {
+ assert.expect(1);
+ var done = assert.async();
+ var counter = 0;
+ var incr = function(){ counter++; };
+ var throttledIncr = _.throttle(incr, 32);
+ throttledIncr(); throttledIncr();
+ _.delay(function(){ assert.equal(counter, 2, 'incr was called twice'); done(); }, 64);
+ });
+
+ QUnit.test('more throttling', function(assert) {
+ assert.expect(3);
+ var done = assert.async();
+ var counter = 0;
+ var incr = function(){ counter++; };
+ var throttledIncr = _.throttle(incr, 30);
+ throttledIncr(); throttledIncr();
+ assert.equal(counter, 1);
+ _.delay(function(){
+ assert.equal(counter, 2);
+ throttledIncr();
+ assert.equal(counter, 3);
+ done();
+ }, 85);
+ });
+
+ QUnit.test('throttle repeatedly with results', function(assert) {
+ assert.expect(6);
+ var done = assert.async();
+ var counter = 0;
+ var incr = function(){ return ++counter; };
+ var throttledIncr = _.throttle(incr, 100);
+ var results = [];
+ var saveResult = function() { results.push(throttledIncr()); };
+ saveResult(); saveResult();
+ _.delay(saveResult, 50);
+ _.delay(saveResult, 150);
+ _.delay(saveResult, 160);
+ _.delay(saveResult, 230);
+ _.delay(function() {
+ assert.equal(results[0], 1, 'incr was called once');
+ assert.equal(results[1], 1, 'incr was throttled');
+ assert.equal(results[2], 1, 'incr was throttled');
+ assert.equal(results[3], 2, 'incr was called twice');
+ assert.equal(results[4], 2, 'incr was throttled');
+ assert.equal(results[5], 3, 'incr was called trailing');
+ done();
+ }, 300);
+ });
+
+ QUnit.test('throttle triggers trailing call when invoked repeatedly', function(assert) {
+ assert.expect(2);
+ var done = assert.async();
+ var counter = 0;
+ var limit = 48;
+ var incr = function(){ counter++; };
+ var throttledIncr = _.throttle(incr, 32);
+
+ var stamp = new Date;
+ while (new Date - stamp < limit) {
+ throttledIncr();
+ }
+ var lastCount = counter;
+ assert.ok(counter > 1);
+
+ _.delay(function() {
+ assert.ok(counter > lastCount);
+ done();
+ }, 96);
+ });
+
+ QUnit.test('throttle does not trigger leading call when leading is set to false', function(assert) {
+ assert.expect(2);
+ var done = assert.async();
+ var counter = 0;
+ var incr = function(){ counter++; };
+ var throttledIncr = _.throttle(incr, 60, {leading: false});
+
+ throttledIncr(); throttledIncr();
+ assert.equal(counter, 0);
+
+ _.delay(function() {
+ assert.equal(counter, 1);
+ done();
+ }, 96);
+ });
+
+ QUnit.test('more throttle does not trigger leading call when leading is set to false', function(assert) {
+ assert.expect(3);
+ var done = assert.async();
+ var counter = 0;
+ var incr = function(){ counter++; };
+ var throttledIncr = _.throttle(incr, 100, {leading: false});
+
+ throttledIncr();
+ _.delay(throttledIncr, 50);
+ _.delay(throttledIncr, 60);
+ _.delay(throttledIncr, 200);
+ assert.equal(counter, 0);
+
+ _.delay(function() {
+ assert.equal(counter, 1);
+ }, 250);
+
+ _.delay(function() {
+ assert.equal(counter, 2);
+ done();
+ }, 350);
+ });
+
+ QUnit.test('one more throttle with leading: false test', function(assert) {
+ assert.expect(2);
+ var done = assert.async();
+ var counter = 0;
+ var incr = function(){ counter++; };
+ var throttledIncr = _.throttle(incr, 100, {leading: false});
+
+ var time = new Date;
+ while (new Date - time < 350) throttledIncr();
+ assert.ok(counter <= 3);
+
+ _.delay(function() {
+ assert.ok(counter <= 4);
+ done();
+ }, 200);
+ });
+
+ QUnit.test('throttle does not trigger trailing call when trailing is set to false', function(assert) {
+ assert.expect(4);
+ var done = assert.async();
+ var counter = 0;
+ var incr = function(){ counter++; };
+ var throttledIncr = _.throttle(incr, 60, {trailing: false});
+
+ throttledIncr(); throttledIncr(); throttledIncr();
+ assert.equal(counter, 1);
+
+ _.delay(function() {
+ assert.equal(counter, 1);
+
+ throttledIncr(); throttledIncr();
+ assert.equal(counter, 2);
+
+ _.delay(function() {
+ assert.equal(counter, 2);
+ done();
+ }, 96);
+ }, 96);
+ });
+
+ QUnit.test('throttle continues to function after system time is set backwards', function(assert) {
+ assert.expect(2);
+ var done = assert.async();
+ var counter = 0;
+ var incr = function(){ counter++; };
+ var throttledIncr = _.throttle(incr, 100);
+ var origNowFunc = _.now;
+
+ throttledIncr();
+ assert.equal(counter, 1);
+ _.now = function() {
+ return new Date(2013, 0, 1, 1, 1, 1);
+ };
+
+ _.delay(function() {
+ throttledIncr();
+ assert.equal(counter, 2);
+ done();
+ _.now = origNowFunc;
+ }, 200);
+ });
+
+ QUnit.test('throttle re-entrant', function(assert) {
+ assert.expect(2);
+ var done = assert.async();
+ var sequence = [
+ ['b1', 'b2'],
+ ['c1', 'c2']
+ ];
+ var value = '';
+ var throttledAppend;
+ var append = function(arg){
+ value += this + arg;
+ var args = sequence.pop();
+ if (args) {
+ throttledAppend.call(args[0], args[1]);
+ }
+ };
+ throttledAppend = _.throttle(append, 32);
+ throttledAppend.call('a1', 'a2');
+ assert.equal(value, 'a1a2');
+ _.delay(function(){
+ assert.equal(value, 'a1a2c1c2b1b2', 'append was throttled successfully');
+ done();
+ }, 100);
+ });
+
+ QUnit.test('throttle cancel', function(assert) {
+ var done = assert.async();
+ var counter = 0;
+ var incr = function(){ counter++; };
+ var throttledIncr = _.throttle(incr, 32);
+ throttledIncr();
+ throttledIncr.cancel();
+ throttledIncr();
+ throttledIncr();
+
+ assert.equal(counter, 2, 'incr was called immediately');
+ _.delay(function(){ assert.equal(counter, 3, 'incr was throttled'); done(); }, 64);
+ });
+
+ QUnit.test('throttle cancel with leading: false', function(assert) {
+ var done = assert.async();
+ var counter = 0;
+ var incr = function(){ counter++; };
+ var throttledIncr = _.throttle(incr, 32, {leading: false});
+ throttledIncr();
+ throttledIncr.cancel();
+
+ assert.equal(counter, 0, 'incr was throttled');
+ _.delay(function(){ assert.equal(counter, 0, 'incr was throttled'); done(); }, 64);
+ });
+
+ QUnit.test('debounce', function(assert) {
+ assert.expect(1);
+ var done = assert.async();
+ var counter = 0;
+ var incr = function(){ counter++; };
+ var debouncedIncr = _.debounce(incr, 32);
+ debouncedIncr(); debouncedIncr();
+ _.delay(debouncedIncr, 16);
+ _.delay(function(){ assert.equal(counter, 1, 'incr was debounced'); done(); }, 96);
+ });
+
+ QUnit.test('debounce cancel', function(assert) {
+ assert.expect(1);
+ var done = assert.async();
+ var counter = 0;
+ var incr = function(){ counter++; };
+ var debouncedIncr = _.debounce(incr, 32);
+ debouncedIncr();
+ debouncedIncr.cancel();
+ _.delay(function(){ assert.equal(counter, 0, 'incr was not called'); done(); }, 96);
+ });
+
+ QUnit.test('debounce asap', function(assert) {
+ assert.expect(6);
+ var done = assert.async();
+ var a, b, c;
+ var counter = 0;
+ var incr = function(){ return ++counter; };
+ var debouncedIncr = _.debounce(incr, 64, true);
+ a = debouncedIncr();
+ b = debouncedIncr();
+ assert.equal(a, 1);
+ assert.equal(b, 1);
+ assert.equal(counter, 1, 'incr was called immediately');
+ _.delay(debouncedIncr, 16);
+ _.delay(debouncedIncr, 32);
+ _.delay(debouncedIncr, 48);
+ _.delay(function(){
+ assert.equal(counter, 1, 'incr was debounced');
+ c = debouncedIncr();
+ assert.equal(c, 2);
+ assert.equal(counter, 2, 'incr was called again');
+ done();
+ }, 128);
+ });
+
+ QUnit.test('debounce asap cancel', function(assert) {
+ assert.expect(4);
+ var done = assert.async();
+ var a, b;
+ var counter = 0;
+ var incr = function(){ return ++counter; };
+ var debouncedIncr = _.debounce(incr, 64, true);
+ a = debouncedIncr();
+ debouncedIncr.cancel();
+ b = debouncedIncr();
+ assert.equal(a, 1);
+ assert.equal(b, 2);
+ assert.equal(counter, 2, 'incr was called immediately');
+ _.delay(debouncedIncr, 16);
+ _.delay(debouncedIncr, 32);
+ _.delay(debouncedIncr, 48);
+ _.delay(function(){ assert.equal(counter, 2, 'incr was debounced'); done(); }, 128);
+ });
+
+ QUnit.test('debounce asap recursively', function(assert) {
+ assert.expect(2);
+ var done = assert.async();
+ var counter = 0;
+ var debouncedIncr = _.debounce(function(){
+ counter++;
+ if (counter < 10) debouncedIncr();
+ }, 32, true);
+ debouncedIncr();
+ assert.equal(counter, 1, 'incr was called immediately');
+ _.delay(function(){ assert.equal(counter, 1, 'incr was debounced'); done(); }, 96);
+ });
+
+ QUnit.test('debounce after system time is set backwards', function(assert) {
+ assert.expect(2);
+ var done = assert.async();
+ var counter = 0;
+ var origNowFunc = _.now;
+ var debouncedIncr = _.debounce(function(){
+ counter++;
+ }, 100, true);
+
+ debouncedIncr();
+ assert.equal(counter, 1, 'incr was called immediately');
+
+ _.now = function() {
+ return new Date(2013, 0, 1, 1, 1, 1);
+ };
+
+ _.delay(function() {
+ debouncedIncr();
+ assert.equal(counter, 2, 'incr was debounced successfully');
+ done();
+ _.now = origNowFunc;
+ }, 200);
+ });
+
+ QUnit.test('debounce re-entrant', function(assert) {
+ assert.expect(2);
+ var done = assert.async();
+ var sequence = [
+ ['b1', 'b2']
+ ];
+ var value = '';
+ var debouncedAppend;
+ var append = function(arg){
+ value += this + arg;
+ var args = sequence.pop();
+ if (args) {
+ debouncedAppend.call(args[0], args[1]);
+ }
+ };
+ debouncedAppend = _.debounce(append, 32);
+ debouncedAppend.call('a1', 'a2');
+ assert.equal(value, '');
+ _.delay(function(){
+ assert.equal(value, 'a1a2b1b2', 'append was debounced successfully');
+ done();
+ }, 100);
+ });
+
+ QUnit.test('once', function(assert) {
+ var num = 0;
+ var increment = _.once(function(){ return ++num; });
+ increment();
+ increment();
+ assert.equal(num, 1);
+
+ assert.equal(increment(), 1, 'stores a memo to the last value');
+ });
+
+ QUnit.test('Recursive onced function.', function(assert) {
+ assert.expect(1);
+ var f = _.once(function(){
+ assert.ok(true);
+ f();
+ });
+ f();
+ });
+
+ QUnit.test('wrap', function(assert) {
+ var greet = function(name){ return 'hi: ' + name; };
+ var backwards = _.wrap(greet, function(func, name){ return func(name) + ' ' + name.split('').reverse().join(''); });
+ assert.equal(backwards('moe'), 'hi: moe eom', 'wrapped the salutation function');
+
+ var inner = function(){ return 'Hello '; };
+ var obj = {name: 'Moe'};
+ obj.hi = _.wrap(inner, function(fn){ return fn() + this.name; });
+ assert.equal(obj.hi(), 'Hello Moe');
+
+ var noop = function(){};
+ var wrapped = _.wrap(noop, function(){ return Array.prototype.slice.call(arguments, 0); });
+ var ret = wrapped(['whats', 'your'], 'vector', 'victor');
+ assert.deepEqual(ret, [noop, ['whats', 'your'], 'vector', 'victor']);
+ });
+
+ QUnit.test('negate', function(assert) {
+ var isOdd = function(n){ return n & 1; };
+ assert.equal(_.negate(isOdd)(2), true, 'should return the complement of the given function');
+ assert.equal(_.negate(isOdd)(3), false, 'should return the complement of the given function');
+ });
+
+ QUnit.test('compose', function(assert) {
+ var greet = function(name){ return 'hi: ' + name; };
+ var exclaim = function(sentence){ return sentence + '!'; };
+ var composed = _.compose(exclaim, greet);
+ assert.equal(composed('moe'), 'hi: moe!', 'can compose a function that takes another');
+
+ composed = _.compose(greet, exclaim);
+ assert.equal(composed('moe'), 'hi: moe!', 'in this case, the functions are also commutative');
+
+ // f(g(h(x, y, z)))
+ function h(x, y, z) {
+ assert.equal(arguments.length, 3, 'First function called with multiple args');
+ return z * y;
+ }
+ function g(x) {
+ assert.equal(arguments.length, 1, 'Composed function is called with 1 argument');
+ return x;
+ }
+ function f(x) {
+ assert.equal(arguments.length, 1, 'Composed function is called with 1 argument');
+ return x * 2;
+ }
+ composed = _.compose(f, g, h);
+ assert.equal(composed(1, 2, 3), 12);
+ });
+
+ QUnit.test('after', function(assert) {
+ var testAfter = function(afterAmount, timesCalled) {
+ var afterCalled = 0;
+ var after = _.after(afterAmount, function() {
+ afterCalled++;
+ });
+ while (timesCalled--) after();
+ return afterCalled;
+ };
+
+ assert.equal(testAfter(5, 5), 1, 'after(N) should fire after being called N times');
+ assert.equal(testAfter(5, 4), 0, 'after(N) should not fire unless called N times');
+ assert.equal(testAfter(0, 0), 0, 'after(0) should not fire immediately');
+ assert.equal(testAfter(0, 1), 1, 'after(0) should fire when first invoked');
+ });
+
+ QUnit.test('before', function(assert) {
+ var testBefore = function(beforeAmount, timesCalled) {
+ var beforeCalled = 0;
+ var before = _.before(beforeAmount, function() { beforeCalled++; });
+ while (timesCalled--) before();
+ return beforeCalled;
+ };
+
+ assert.equal(testBefore(5, 5), 4, 'before(N) should not fire after being called N times');
+ assert.equal(testBefore(5, 4), 4, 'before(N) should fire before being called N times');
+ assert.equal(testBefore(0, 0), 0, 'before(0) should not fire immediately');
+ assert.equal(testBefore(0, 1), 0, 'before(0) should not fire when first invoked');
+
+ var context = {num: 0};
+ var increment = _.before(3, function(){ return ++this.num; });
+ _.times(10, increment, context);
+ assert.equal(increment(), 2, 'stores a memo to the last value');
+ assert.equal(context.num, 2, 'provides context');
+ });
+
+ QUnit.test('iteratee', function(assert) {
+ var identity = _.iteratee();
+ assert.equal(identity, _.identity, '_.iteratee is exposed as an external function.');
+
+ function fn() {
+ return arguments;
+ }
+ _.each([_.iteratee(fn), _.iteratee(fn, {})], function(cb) {
+ assert.equal(cb().length, 0);
+ assert.deepEqual(_.toArray(cb(1, 2, 3)), _.range(1, 4));
+ assert.deepEqual(_.toArray(cb(1, 2, 3, 4, 5, 6, 7, 8, 9, 10)), _.range(1, 11));
+ });
+
+ });
+
+ QUnit.test('restArgs', function(assert) {
+ assert.expect(10);
+ _.restArgs(function(a, args) {
+ assert.strictEqual(a, 1);
+ assert.deepEqual(args, [2, 3], 'collects rest arguments into an array');
+ })(1, 2, 3);
+
+ _.restArgs(function(a, args) {
+ assert.strictEqual(a, void 0);
+ assert.deepEqual(args, [], 'passes empty array if there are not enough arguments');
+ })();
+
+ _.restArgs(function(a, b, c, args) {
+ assert.strictEqual(arguments.length, 4);
+ assert.deepEqual(args, [4, 5], 'works on functions with many named parameters');
+ })(1, 2, 3, 4, 5);
+
+ var obj = {};
+ _.restArgs(function() {
+ assert.strictEqual(this, obj, 'invokes function with this context');
+ }).call(obj);
+
+ _.restArgs(function(array, iteratee, context) {
+ assert.deepEqual(array, [1, 2, 3, 4], 'startIndex can be used manually specify index of rest parameter');
+ assert.strictEqual(iteratee, void 0);
+ assert.strictEqual(context, void 0);
+ }, 0)(1, 2, 3, 4);
+ });
+
+}());
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