text: (function() {
  
    module('Objects');
  
    test('keys', function() {
      equal(_.keys({one : 1, two : 2}).join(', '), 'one, two', 'can extract the keys from an object');
      // the test above is not safe because it relies on for-in enumeration order
      var a = []; a[1] = 0;
      equal(_.keys(a).join(', '), '1', 'is not fooled by sparse arrays; see issue #95');
      deepEqual(_.keys(null), []);
      deepEqual(_.keys(void 0), []);
      deepEqual(_.keys(1), []);
      deepEqual(_.keys('a'), []);
      deepEqual(_.keys(true), []);
    });
  
    test('values', function() {
      equal(_.values({one: 1, two: 2}).join(', '), '1, 2', 'can extract the values from an object');
      equal(_.values({one: 1, two: 2, length: 3}).join(', '), '1, 2, 3', '... even when one of them is "length"');
    });
  
    test('pairs', function() {
      deepEqual(_.pairs({one: 1, two: 2}), [['one', 1], ['two', 2]], 'can convert an object into pairs');
      deepEqual(_.pairs({one: 1, two: 2, length: 3}), [['one', 1], ['two', 2], ['length', 3]], '... even when one of them is "length"');
    });
  
    test('invert', function() {
      var obj = {first: 'Moe', second: 'Larry', third: 'Curly'};
      equal(_.keys(_.invert(obj)).join(' '), 'Moe Larry Curly', 'can invert an object');
      ok(_.isEqual(_.invert(_.invert(obj)), obj), 'two inverts gets you back where you started');
  
      var obj = {length: 3};
      ok(_.invert(obj)['3'] == 'length', 'can invert an object with "length"')
    });
  
    test('functions', function() {
      var obj = {a : 'dash', b : _.map, c : (/yo/), d : _.reduce};
      ok(_.isEqual(['b', 'd'], _.functions(obj)), 'can grab the function names of any passed-in object');
  
      var Animal = function(){};
      Animal.prototype.run = function(){};
      equal(_.functions(new Animal).join(''), 'run', 'also looks up functions on the prototype');
    });
  
    test('extend', function() {
      var result;
      equal(_.extend({}, {a:'b'}).a, 'b', 'can extend an object with the attributes of another');
      equal(_.extend({a:'x'}, {a:'b'}).a, 'b', 'properties in source override destination');
      equal(_.extend({x:'x'}, {a:'b'}).x, 'x', "properties not in source don't get overriden");
      result = _.extend({x:'x'}, {a:'a'}, {b:'b'});
      ok(_.isEqual(result, {x:'x', a:'a', b:'b'}), 'can extend from multiple source objects');
      result = _.extend({x:'x'}, {a:'a', x:2}, {a:'b'});
      ok(_.isEqual(result, {x:2, a:'b'}), 'extending from multiple source objects last property trumps');
      result = _.extend({}, {a: void 0, b: null});
      equal(_.keys(result).join(''), 'ab', 'extend copies undefined values');
  
      try {
        result = {};
        _.extend(result, null, undefined, {a:1});
      } catch(ex) {}
  
      equal(result.a, 1, 'should not error on `null` or `undefined` sources');
    });
  
    test('pick', function() {
      var result;
      result = _.pick({a:1, b:2, c:3}, 'a', 'c');
      ok(_.isEqual(result, {a:1, c:3}), 'can restrict properties to those named');
      result = _.pick({a:1, b:2, c:3}, ['b', 'c']);
      ok(_.isEqual(result, {b:2, c:3}), 'can restrict properties to those named in an array');
      result = _.pick({a:1, b:2, c:3}, ['a'], 'b');
      ok(_.isEqual(result, {a:1, b:2}), 'can restrict properties to those named in mixed args');
  
      var Obj = function(){};
      Obj.prototype = {a: 1, b: 2, c: 3};
      ok(_.isEqual(_.pick(new Obj, 'a', 'c'), {a:1, c: 3}), 'include prototype props');
    });
  
    test('omit', function() {
      var result;
      result = _.omit({a:1, b:2, c:3}, 'b');
      ok(_.isEqual(result, {a:1, c:3}), 'can omit a single named property');
      result = _.omit({a:1, b:2, c:3}, 'a', 'c');
      ok(_.isEqual(result, {b:2}), 'can omit several named properties');
      result = _.omit({a:1, b:2, c:3}, ['b', 'c']);
      ok(_.isEqual(result, {a:1}), 'can omit properties named in an array');
  
      var Obj = function(){};
      Obj.prototype = {a: 1, b: 2, c: 3};
      ok(_.isEqual(_.omit(new Obj, 'b'), {a:1, c: 3}), 'include prototype props');
    });
  
    test('defaults', function() {
      var result;
      var options = {zero: 0, one: 1, empty: '', nan: NaN, nothing: null};
  
      _.defaults(options, {zero: 1, one: 10, twenty: 20, nothing: 'str'});
      equal(options.zero, 0, 'value exists');
      equal(options.one, 1, 'value exists');
      equal(options.twenty, 20, 'default applied');
      equal(options.nothing, null, "null isn't overridden");
  
      _.defaults(options, {empty: 'full'}, {nan: 'nan'}, {word: 'word'}, {word: 'dog'});
      equal(options.empty, '', 'value exists');
      ok(_.isNaN(options.nan), "NaN isn't overridden");
      equal(options.word, 'word', 'new value is added, first one wins');
  
      try {
        options = {};
        _.defaults(options, null, undefined, {a:1});
      } catch(ex) {}
  
      equal(options.a, 1, 'should not error on `null` or `undefined` sources');
    });
  
    test('clone', function() {
      var moe = {name : 'moe', lucky : [13, 27, 34]};
      var clone = _.clone(moe);
      equal(clone.name, 'moe', 'the clone as the attributes of the original');
  
      clone.name = 'curly';
      ok(clone.name == 'curly' && moe.name == 'moe', 'clones can change shallow attributes without affecting the original');
  
      clone.lucky.push(101);
      equal(_.last(moe.lucky), 101, 'changes to deep attributes are shared with the original');
  
      equal(_.clone(undefined), void 0, 'non objects should not be changed by clone');
      equal(_.clone(1), 1, 'non objects should not be changed by clone');
      equal(_.clone(null), null, 'non objects should not be changed by clone');
    });
  
    test('isEqual', function() {
      function First() {
        this.value = 1;
      }
      First.prototype.value = 1;
      function Second() {
        this.value = 1;
      }
      Second.prototype.value = 2;
  
      // Basic equality and identity comparisons.
      ok(_.isEqual(null, null), '`null` is equal to `null`');
      ok(_.isEqual(), '`undefined` is equal to `undefined`');
  
      ok(!_.isEqual(0, -0), '`0` is not equal to `-0`');
      ok(!_.isEqual(-0, 0), 'Commutative equality is implemented for `0` and `-0`');
      ok(!_.isEqual(null, undefined), '`null` is not equal to `undefined`');
      ok(!_.isEqual(undefined, null), 'Commutative equality is implemented for `null` and `undefined`');
  
      // String object and primitive comparisons.
      ok(_.isEqual('Curly', 'Curly'), 'Identical string primitives are equal');
      ok(_.isEqual(new String('Curly'), new String('Curly')), 'String objects with identical primitive values are equal');
      ok(_.isEqual(new String('Curly'), 'Curly'), 'String primitives and their corresponding object wrappers are equal');
      ok(_.isEqual('Curly', new String('Curly')), 'Commutative equality is implemented for string objects and primitives');
  
      ok(!_.isEqual('Curly', 'Larry'), 'String primitives with different values are not equal');
      ok(!_.isEqual(new String('Curly'), new String('Larry')), 'String objects with different primitive values are not equal');
      ok(!_.isEqual(new String('Curly'), {toString: function(){ return 'Curly'; }}), 'String objects and objects with a custom `toString` method are not equal');
  
      // Number object and primitive comparisons.
      ok(_.isEqual(75, 75), 'Identical number primitives are equal');
      ok(_.isEqual(new Number(75), new Number(75)), 'Number objects with identical primitive values are equal');
      ok(_.isEqual(75, new Number(75)), 'Number primitives and their corresponding object wrappers are equal');
      ok(_.isEqual(new Number(75), 75), 'Commutative equality is implemented for number objects and primitives');
      ok(!_.isEqual(new Number(0), -0), '`new Number(0)` and `-0` are not equal');
      ok(!_.isEqual(0, new Number(-0)), 'Commutative equality is implemented for `new Number(0)` and `-0`');
  
      ok(!_.isEqual(new Number(75), new Number(63)), 'Number objects with different primitive values are not equal');
      ok(!_.isEqual(new Number(63), {valueOf: function(){ return 63; }}), 'Number objects and objects with a `valueOf` method are not equal');
  
      // Comparisons involving `NaN`.
      ok(_.isEqual(NaN, NaN), '`NaN` is equal to `NaN`');
      ok(!_.isEqual(61, NaN), 'A number primitive is not equal to `NaN`');
      ok(!_.isEqual(new Number(79), NaN), 'A number object is not equal to `NaN`');
      ok(!_.isEqual(Infinity, NaN), '`Infinity` is not equal to `NaN`');
  
      // Boolean object and primitive comparisons.
      ok(_.isEqual(true, true), 'Identical boolean primitives are equal');
      ok(_.isEqual(new Boolean, new Boolean), 'Boolean objects with identical primitive values are equal');
      ok(_.isEqual(true, new Boolean(true)), 'Boolean primitives and their corresponding object wrappers are equal');
      ok(_.isEqual(new Boolean(true), true), 'Commutative equality is implemented for booleans');
      ok(!_.isEqual(new Boolean(true), new Boolean), 'Boolean objects with different primitive values are not equal');
  
      // Common type coercions.
      ok(!_.isEqual(new Boolean(false), true), '`new Boolean(false)` is not equal to `true`');
      ok(!_.isEqual('75', 75), 'String and number primitives with like values are not equal');
      ok(!_.isEqual(new Number(63), new String(63)), 'String and number objects with like values are not equal');
      ok(!_.isEqual(75, '75'), 'Commutative equality is implemented for like string and number values');
      ok(!_.isEqual(0, ''), 'Number and string primitives with like values are not equal');
      ok(!_.isEqual(1, true), 'Number and boolean primitives with like values are not equal');
      ok(!_.isEqual(new Boolean(false), new Number(0)), 'Boolean and number objects with like values are not equal');
      ok(!_.isEqual(false, new String('')), 'Boolean primitives and string objects with like values are not equal');
      ok(!_.isEqual(12564504e5, new Date(2009, 9, 25)), 'Dates and their corresponding numeric primitive values are not equal');
  
      // Dates.
      ok(_.isEqual(new Date(2009, 9, 25), new Date(2009, 9, 25)), 'Date objects referencing identical times are equal');
      ok(!_.isEqual(new Date(2009, 9, 25), new Date(2009, 11, 13)), 'Date objects referencing different times are not equal');
      ok(!_.isEqual(new Date(2009, 11, 13), {
        getTime: function(){
          return 12606876e5;
        }
      }), 'Date objects and objects with a `getTime` method are not equal');
      ok(!_.isEqual(new Date('Curly'), new Date('Curly')), 'Invalid dates are not equal');
  
      // Functions.
      ok(!_.isEqual(First, Second), 'Different functions with identical bodies and source code representations are not equal');
  
      // RegExps.
      ok(_.isEqual(/(?:)/gim, /(?:)/gim), 'RegExps with equivalent patterns and flags are equal');
      ok(_.isEqual(/(?:)/gi, /(?:)/ig), 'Flag order is not significant');
      ok(!_.isEqual(/(?:)/g, /(?:)/gi), 'RegExps with equivalent patterns and different flags are not equal');
      ok(!_.isEqual(/Moe/gim, /Curly/gim), 'RegExps with different patterns and equivalent flags are not equal');
      ok(!_.isEqual(/(?:)/gi, /(?:)/g), 'Commutative equality is implemented for RegExps');
      ok(!_.isEqual(/Curly/g, {source: 'Larry', global: true, ignoreCase: false, multiline: false}), 'RegExps and RegExp-like objects are not equal');
  
      // Empty arrays, array-like objects, and object literals.
      ok(_.isEqual({}, {}), 'Empty object literals are equal');
      ok(_.isEqual([], []), 'Empty array literals are equal');
      ok(_.isEqual([{}], [{}]), 'Empty nested arrays and objects are equal');
      ok(!_.isEqual({length: 0}, []), 'Array-like objects and arrays are not equal.');
      ok(!_.isEqual([], {length: 0}), 'Commutative equality is implemented for array-like objects');
  
      ok(!_.isEqual({}, []), 'Object literals and array literals are not equal');
      ok(!_.isEqual([], {}), 'Commutative equality is implemented for objects and arrays');
  
      // Arrays with primitive and object values.
      ok(_.isEqual([1, 'Larry', true], [1, 'Larry', true]), 'Arrays containing identical primitives are equal');
      ok(_.isEqual([(/Moe/g), new Date(2009, 9, 25)], [(/Moe/g), new Date(2009, 9, 25)]), 'Arrays containing equivalent elements are equal');
  
      // Multi-dimensional arrays.
      var a = [new Number(47), false, 'Larry', /Moe/, new Date(2009, 11, 13), ['running', 'biking', new String('programming')], {a: 47}];
      var b = [new Number(47), false, 'Larry', /Moe/, new Date(2009, 11, 13), ['running', 'biking', new String('programming')], {a: 47}];
      ok(_.isEqual(a, b), 'Arrays containing nested arrays and objects are recursively compared');
  
      // Overwrite the methods defined in ES 5.1 section 15.4.4.
      a.forEach = a.map = a.filter = a.every = a.indexOf = a.lastIndexOf = a.some = a.reduce = a.reduceRight = null;
      b.join = b.pop = b.reverse = b.shift = b.slice = b.splice = b.concat = b.sort = b.unshift = null;
  
      // Array elements and properties.
      ok(_.isEqual(a, b), 'Arrays containing equivalent elements and different non-numeric properties are equal');
      a.push('White Rocks');
      ok(!_.isEqual(a, b), 'Arrays of different lengths are not equal');
      a.push('East Boulder');
      b.push('Gunbarrel Ranch', 'Teller Farm');
      ok(!_.isEqual(a, b), 'Arrays of identical lengths containing different elements are not equal');
  
      // Sparse arrays.
      ok(_.isEqual(Array(3), Array(3)), 'Sparse arrays of identical lengths are equal');
      ok(!_.isEqual(Array(3), Array(6)), 'Sparse arrays of different lengths are not equal when both are empty');
  
      // Simple objects.
      ok(_.isEqual({a: 'Curly', b: 1, c: true}, {a: 'Curly', b: 1, c: true}), 'Objects containing identical primitives are equal');
      ok(_.isEqual({a: /Curly/g, b: new Date(2009, 11, 13)}, {a: /Curly/g, b: new Date(2009, 11, 13)}), 'Objects containing equivalent members are equal');
      ok(!_.isEqual({a: 63, b: 75}, {a: 61, b: 55}), 'Objects of identical sizes with different values are not equal');
      ok(!_.isEqual({a: 63, b: 75}, {a: 61, c: 55}), 'Objects of identical sizes with different property names are not equal');
      ok(!_.isEqual({a: 1, b: 2}, {a: 1}), 'Objects of different sizes are not equal');
      ok(!_.isEqual({a: 1}, {a: 1, b: 2}), 'Commutative equality is implemented for objects');
      ok(!_.isEqual({x: 1, y: undefined}, {x: 1, z: 2}), 'Objects with identical keys and different values are not equivalent');
  
      // `A` contains nested objects and arrays.
      a = {
        name: new String('Moe Howard'),
        age: new Number(77),
        stooge: true,
        hobbies: ['acting'],
        film: {
          name: 'Sing a Song of Six Pants',
          release: new Date(1947, 9, 30),
          stars: [new String('Larry Fine'), 'Shemp Howard'],
          minutes: new Number(16),
          seconds: 54
        }
      };
  
      // `B` contains equivalent nested objects and arrays.
      b = {
        name: new String('Moe Howard'),
        age: new Number(77),
        stooge: true,
        hobbies: ['acting'],
        film: {
          name: 'Sing a Song of Six Pants',
          release: new Date(1947, 9, 30),
          stars: [new String('Larry Fine'), 'Shemp Howard'],
          minutes: new Number(16),
          seconds: 54
        }
      };
      ok(_.isEqual(a, b), 'Objects with nested equivalent members are recursively compared');
  
      // Instances.
      ok(_.isEqual(new First, new First), 'Object instances are equal');
      ok(!_.isEqual(new First, new Second), 'Objects with different constructors and identical own properties are not equal');
      ok(!_.isEqual({value: 1}, new First), 'Object instances and objects sharing equivalent properties are not equal');
      ok(!_.isEqual({value: 2}, new Second), 'The prototype chain of objects should not be examined');
  
      // Circular Arrays.
      (a = []).push(a);
      (b = []).push(b);
      ok(_.isEqual(a, b), 'Arrays containing circular references are equal');
      a.push(new String('Larry'));
      b.push(new String('Larry'));
      ok(_.isEqual(a, b), 'Arrays containing circular references and equivalent properties are equal');
      a.push('Shemp');
      b.push('Curly');
      ok(!_.isEqual(a, b), 'Arrays containing circular references and different properties are not equal');
  
      // More circular arrays #767.
      a = ['everything is checked but', 'this', 'is not'];
      a[1] = a;
      b = ['everything is checked but', ['this', 'array'], 'is not'];
      ok(!_.isEqual(a, b), 'Comparison of circular references with non-circular references are not equal');
  
      // Circular Objects.
      a = {abc: null};
      b = {abc: null};
      a.abc = a;
      b.abc = b;
      ok(_.isEqual(a, b), 'Objects containing circular references are equal');
      a.def = 75;
      b.def = 75;
      ok(_.isEqual(a, b), 'Objects containing circular references and equivalent properties are equal');
      a.def = new Number(75);
      b.def = new Number(63);
      ok(!_.isEqual(a, b), 'Objects containing circular references and different properties are not equal');
  
      // More circular objects #767.
      a = {everything: 'is checked', but: 'this', is: 'not'};
      a.but = a;
      b = {everything: 'is checked', but: {that:'object'}, is: 'not'};
      ok(!_.isEqual(a, b), 'Comparison of circular references with non-circular object references are not equal');
  
      // Cyclic Structures.
      a = [{abc: null}];
      b = [{abc: null}];
      (a[0].abc = a).push(a);
      (b[0].abc = b).push(b);
      ok(_.isEqual(a, b), 'Cyclic structures are equal');
      a[0].def = 'Larry';
      b[0].def = 'Larry';
      ok(_.isEqual(a, b), 'Cyclic structures containing equivalent properties are equal');
      a[0].def = new String('Larry');
      b[0].def = new String('Curly');
      ok(!_.isEqual(a, b), 'Cyclic structures containing different properties are not equal');
  
      // Complex Circular References.
      a = {foo: {b: {foo: {c: {foo: null}}}}};
      b = {foo: {b: {foo: {c: {foo: null}}}}};
      a.foo.b.foo.c.foo = a;
      b.foo.b.foo.c.foo = b;
      ok(_.isEqual(a, b), 'Cyclic structures with nested and identically-named properties are equal');
  
      // Chaining.
      ok(!_.isEqual(_({x: 1, y: undefined}).chain(), _({x: 1, z: 2}).chain()), 'Chained objects containing different values are not equal');
  
      a = _({x: 1, y: 2}).chain();
      b = _({x: 1, y: 2}).chain();
      equal(_.isEqual(a.isEqual(b), _(true)), true, '`isEqual` can be chained');
  
      // Objects from another frame.
      ok(_.isEqual({}, iObject));
  
      // Objects without a `constructor` property
      if (Object.create) {
          a = Object.create(null, {x: {value: 1, enumerable: true}});
          b = {x: 1};
          ok(_.isEqual(a, b));
      }
  
      function Foo() { this.a = 1; }
      Foo.prototype.constructor = null;
  
      var other = { 'a': 1 };
      strictEqual(_.isEqual(new Foo, other), false);
    });
  
    test('isEmpty', function() {
      ok(!_([1]).isEmpty(), '[1] is not empty');
      ok(_.isEmpty([]), '[] is empty');
      ok(!_.isEmpty({one : 1}), '{one : 1} is not empty');
      ok(_.isEmpty({}), '{} is empty');
      ok(_.isEmpty(new RegExp('')), 'objects with prototype properties are empty');
      ok(_.isEmpty(null), 'null is empty');
      ok(_.isEmpty(), 'undefined is empty');
      ok(_.isEmpty(''), 'the empty string is empty');
      ok(!_.isEmpty('moe'), 'but other strings are not');
  
      var obj = {one : 1};
      delete obj.one;
      ok(_.isEmpty(obj), 'deleting all the keys from an object empties it');
    });
  
    // Setup remote variables for iFrame tests.
    var iframe = document.createElement('iframe');
    iframe.frameBorder = iframe.height = iframe.width = 0
    document.body.appendChild(iframe);
    var iDoc = (iDoc = iframe.contentDocument || iframe.contentWindow).document || iDoc;
    iDoc.write(
      '<script>\
        parent.iElement   = document.createElement("div");\
        parent.iArguments = (function(){ return arguments; })(1, 2, 3);\
        parent.iArray     = [1, 2, 3];\
        parent.iString    = new String("hello");\
        parent.iNumber    = new Number(100);\
        parent.iFunction  = (function(){});\
        parent.iDate      = new Date();\
        parent.iRegExp    = /hi/;\
        parent.iNaN       = NaN;\
        parent.iNull      = null;\
        parent.iBoolean   = new Boolean(false);\
        parent.iUndefined = undefined;\
        parent.iObject     = {};\
      </script>'
    );
    iDoc.close();
  
    test('isElement', function() {
      ok(!_.isElement('div'), 'strings are not dom elements');
      ok(_.isElement(document.body), 'the body tag is a DOM element');
      ok(_.isElement(iElement), 'even from another frame');
    });
  
    test('isArguments', function() {
      var args = (function(){ return arguments; })(1, 2, 3);
      ok(!_.isArguments('string'), 'a string is not an arguments object');
      ok(!_.isArguments(_.isArguments), 'a function is not an arguments object');
      ok(_.isArguments(args), 'but the arguments object is an arguments object');
      ok(!_.isArguments(_.toArray(args)), 'but not when it\'s converted into an array');
      ok(!_.isArguments([1,2,3]), 'and not vanilla arrays.');
      ok(_.isArguments(iArguments), 'even from another frame');
    });
  
    test('isObject', function() {
      ok(_.isObject(arguments), 'the arguments object is object');
      ok(_.isObject([1, 2, 3]), 'and arrays');
      ok(_.isObject(document.body), 'and DOM element');
      ok(_.isObject(iElement), 'even from another frame');
      ok(_.isObject(function () {}), 'and functions');
      ok(_.isObject(iFunction), 'even from another frame');
      ok(!_.isObject(null), 'but not null');
      ok(!_.isObject(undefined), 'and not undefined');
      ok(!_.isObject('string'), 'and not string');
      ok(!_.isObject(12), 'and not number');
      ok(!_.isObject(true), 'and not boolean');
      ok(_.isObject(new String('string')), 'but new String()');
    });
  
    test('isArray', function() {
      ok(!_.isArray(undefined), 'undefined vars are not arrays');
      ok(!_.isArray(arguments), 'the arguments object is not an array');
      ok(_.isArray([1, 2, 3]), 'but arrays are');
      ok(_.isArray(iArray), 'even from another frame');
    });
  
    test('isString', function() {
      var obj = new String('I am a string object');
      ok(!_.isString(document.body), 'the document body is not a string');
      ok(_.isString([1, 2, 3].join(', ')), 'but strings are');
      ok(_.isString(iString), 'even from another frame');
      ok(_.isString('I am a string literal'), 'string literals are');
      ok(_.isString(obj), 'so are String objects');
    });
  
    test('isNumber', function() {
      ok(!_.isNumber('string'), 'a string is not a number');
      ok(!_.isNumber(arguments), 'the arguments object is not a number');
      ok(!_.isNumber(undefined), 'undefined is not a number');
      ok(_.isNumber(3 * 4 - 7 / 10), 'but numbers are');
      ok(_.isNumber(NaN), 'NaN *is* a number');
      ok(_.isNumber(Infinity), 'Infinity is a number');
      ok(_.isNumber(iNumber), 'even from another frame');
      ok(!_.isNumber('1'), 'numeric strings are not numbers');
    });
  
    test('isBoolean', function() {
      ok(!_.isBoolean(2), 'a number is not a boolean');
      ok(!_.isBoolean('string'), 'a string is not a boolean');
      ok(!_.isBoolean('false'), 'the string "false" is not a boolean');
      ok(!_.isBoolean('true'), 'the string "true" is not a boolean');
      ok(!_.isBoolean(arguments), 'the arguments object is not a boolean');
      ok(!_.isBoolean(undefined), 'undefined is not a boolean');
      ok(!_.isBoolean(NaN), 'NaN is not a boolean');
      ok(!_.isBoolean(null), 'null is not a boolean');
      ok(_.isBoolean(true), 'but true is');
      ok(_.isBoolean(false), 'and so is false');
      ok(_.isBoolean(iBoolean), 'even from another frame');
    });
  
    test('isFunction', function() {
      ok(!_.isFunction(undefined), 'undefined vars are not functions');
      ok(!_.isFunction([1, 2, 3]), 'arrays are not functions');
      ok(!_.isFunction('moe'), 'strings are not functions');
      ok(_.isFunction(_.isFunction), 'but functions are');
      ok(_.isFunction(iFunction), 'even from another frame');
      ok(_.isFunction(function(){}), 'even anonymous ones');
    });
  
    test('isDate', function() {
      ok(!_.isDate(100), 'numbers are not dates');
      ok(!_.isDate({}), 'objects are not dates');
      ok(_.isDate(new Date()), 'but dates are');
      ok(_.isDate(iDate), 'even from another frame');
    });
  
    test('isRegExp', function() {
      ok(!_.isRegExp(_.identity), 'functions are not RegExps');
      ok(_.isRegExp(/identity/), 'but RegExps are');
      ok(_.isRegExp(iRegExp), 'even from another frame');
    });
  
    test('isFinite', function() {
      ok(!_.isFinite(undefined), 'undefined is not finite');
      ok(!_.isFinite(null), 'null is not finite');
      ok(!_.isFinite(NaN), 'NaN is not finite');
      ok(!_.isFinite(Infinity), 'Infinity is not finite');
      ok(!_.isFinite(-Infinity), '-Infinity is not finite');
      ok(_.isFinite('12'), 'Numeric strings are numbers');
      ok(!_.isFinite('1a'), 'Non numeric strings are not numbers');
      ok(!_.isFinite(''), 'Empty strings are not numbers');
      var obj = new Number(5);
      ok(_.isFinite(obj), 'Number instances can be finite');
      ok(_.isFinite(0), '0 is finite');
      ok(_.isFinite(123), 'Ints are finite');
      ok(_.isFinite(-12.44), 'Floats are finite');
    });
  
    test('isNaN', function() {
      ok(!_.isNaN(undefined), 'undefined is not NaN');
      ok(!_.isNaN(null), 'null is not NaN');
      ok(!_.isNaN(0), '0 is not NaN');
      ok(_.isNaN(NaN), 'but NaN is');
      ok(_.isNaN(iNaN), 'even from another frame');
      ok(_.isNaN(new Number(NaN)), 'wrapped NaN is still NaN');
    });
  
    test('isNull', function() {
      ok(!_.isNull(undefined), 'undefined is not null');
      ok(!_.isNull(NaN), 'NaN is not null');
      ok(_.isNull(null), 'but null is');
      ok(_.isNull(iNull), 'even from another frame');
    });
  
    test('isUndefined', function() {
      ok(!_.isUndefined(1), 'numbers are defined');
      ok(!_.isUndefined(null), 'null is defined');
      ok(!_.isUndefined(false), 'false is defined');
      ok(!_.isUndefined(NaN), 'NaN is defined');
      ok(_.isUndefined(), 'nothing is undefined');
      ok(_.isUndefined(undefined), 'undefined is undefined');
      ok(_.isUndefined(iUndefined), 'even from another frame');
    });
  
    if (window.ActiveXObject) {
      test('IE host objects', function() {
        var xml = new ActiveXObject('Msxml2.DOMDocument.3.0');
        ok(!_.isNumber(xml));
        ok(!_.isBoolean(xml));
        ok(!_.isNaN(xml));
        ok(!_.isFunction(xml));
        ok(!_.isNull(xml));
        ok(!_.isUndefined(xml));
      });
    }
  
    test('tap', function() {
      var intercepted = null;
      var interceptor = function(obj) { intercepted = obj; };
      var returned = _.tap(1, interceptor);
      equal(intercepted, 1, 'passes tapped object to interceptor');
      equal(returned, 1, 'returns tapped object');
  
      returned = _([1,2,3]).chain().
        map(function(n){ return n * 2; }).
        max().
        tap(interceptor).
        value();
      ok(returned == 6 && intercepted == 6, 'can use tapped objects in a chain');
    });
  
    test("has", function () {
      var obj = {foo: "bar", func: function () {} };
      ok(_.has(obj, "foo"), "has() checks that the object has a property.");
      ok(_.has(obj, "baz") == false, "has() returns false if the object doesn't have the property.");
      ok(_.has(obj, "func"), "has() works for functions too.");
      obj.hasOwnProperty = null;
      ok(_.has(obj, "foo"), "has() works even when the hasOwnProperty method is deleted.");
      var child = {};
      child.prototype = obj;
      ok(_.has(child, "foo") == false, "has() does not check the prototype chain for a property.");
    });
  
    test("matches", function() {
      var moe = {name: 'Moe Howard', hair: true};
      var curly = {name: 'Curly Howard', hair: false};
      var stooges = [moe, curly];
      ok(_.find(stooges, _.matches({hair: false})) === curly, "returns a predicate that can be used by finding functions.");
      ok(_.find(stooges, _.matches(moe)) === moe, "can be used to locate an object exists in a collection.");
    });
  
  })();
  