text: (function() {
    var _ = typeof require == 'function' ? require('..') : window._;
  
    QUnit.module('Objects');
  
    var testElement = typeof document === 'object' ? document.createElement('div') : void 0;
  
    QUnit.test('keys', function(assert) {
      assert.deepEqual(_.keys({one: 1, two: 2}), ['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;
      assert.deepEqual(_.keys(a), ['1'], 'is not fooled by sparse arrays; see issue #95');
      assert.deepEqual(_.keys(null), []);
      assert.deepEqual(_.keys(void 0), []);
      assert.deepEqual(_.keys(1), []);
      assert.deepEqual(_.keys('a'), []);
      assert.deepEqual(_.keys(true), []);
  
      // keys that may be missed if the implementation isn't careful
      var trouble = {
        constructor: Object,
        valueOf: _.noop,
        hasOwnProperty: null,
        toString: 5,
        toLocaleString: void 0,
        propertyIsEnumerable: /a/,
        isPrototypeOf: this,
        __defineGetter__: Boolean,
        __defineSetter__: {},
        __lookupSetter__: false,
        __lookupGetter__: []
      };
      var troubleKeys = ['constructor', 'valueOf', 'hasOwnProperty', 'toString', 'toLocaleString', 'propertyIsEnumerable',
                    'isPrototypeOf', '__defineGetter__', '__defineSetter__', '__lookupSetter__', '__lookupGetter__'].sort();
      assert.deepEqual(_.keys(trouble).sort(), troubleKeys, 'matches non-enumerable properties');
    });
  
    QUnit.test('allKeys', function(assert) {
      assert.deepEqual(_.allKeys({one: 1, two: 2}), ['one', 'two'], 'can extract the allKeys from an object');
      // the test above is not safe because it relies on for-in enumeration order
      var a = []; a[1] = 0;
      assert.deepEqual(_.allKeys(a), ['1'], 'is not fooled by sparse arrays; see issue #95');
  
      a.a = a;
      assert.deepEqual(_.allKeys(a), ['1', 'a'], 'is not fooled by sparse arrays with additional properties');
  
      _.each([null, void 0, 1, 'a', true, NaN, {}, [], new Number(5), new Date(0)], function(val) {
        assert.deepEqual(_.allKeys(val), []);
      });
  
      // allKeys that may be missed if the implementation isn't careful
      var trouble = {
        constructor: Object,
        valueOf: _.noop,
        hasOwnProperty: null,
        toString: 5,
        toLocaleString: void 0,
        propertyIsEnumerable: /a/,
        isPrototypeOf: this
      };
      var troubleKeys = ['constructor', 'valueOf', 'hasOwnProperty', 'toString', 'toLocaleString', 'propertyIsEnumerable',
                    'isPrototypeOf'].sort();
      assert.deepEqual(_.allKeys(trouble).sort(), troubleKeys, 'matches non-enumerable properties');
  
      function A() {}
      A.prototype.foo = 'foo';
      var b = new A();
      b.bar = 'bar';
      assert.deepEqual(_.allKeys(b).sort(), ['bar', 'foo'], 'should include inherited keys');
  
      function y() {}
      y.x = 'z';
      assert.deepEqual(_.allKeys(y), ['x'], 'should get keys from constructor');
    });
  
    QUnit.test('values', function(assert) {
      assert.deepEqual(_.values({one: 1, two: 2}), [1, 2], 'can extract the values from an object');
      assert.deepEqual(_.values({one: 1, two: 2, length: 3}), [1, 2, 3], '... even when one of them is "length"');
    });
  
    QUnit.test('pairs', function(assert) {
      assert.deepEqual(_.pairs({one: 1, two: 2}), [['one', 1], ['two', 2]], 'can convert an object into pairs');
      assert.deepEqual(_.pairs({one: 1, two: 2, length: 3}), [['one', 1], ['two', 2], ['length', 3]], '... even when one of them is "length"');
    });
  
    QUnit.test('invert', function(assert) {
      var obj = {first: 'Moe', second: 'Larry', third: 'Curly'};
      assert.deepEqual(_.keys(_.invert(obj)), ['Moe', 'Larry', 'Curly'], 'can invert an object');
      assert.deepEqual(_.invert(_.invert(obj)), obj, 'two inverts gets you back where you started');
  
      obj = {length: 3};
      assert.equal(_.invert(obj)['3'], 'length', 'can invert an object with "length"');
    });
  
    QUnit.test('functions', function(assert) {
      var obj = {a: 'dash', b: _.map, c: /yo/, d: _.reduce};
      assert.deepEqual(['b', 'd'], _.functions(obj), 'can grab the function names of any passed-in object');
  
      var Animal = function(){};
      Animal.prototype.run = function(){};
      assert.deepEqual(_.functions(new Animal), ['run'], 'also looks up functions on the prototype');
    });
  
    QUnit.test('methods', function(assert) {
      assert.strictEqual(_.methods, _.functions, 'is an alias for functions');
    });
  
    QUnit.test('extend', function(assert) {
      var result;
      assert.equal(_.extend({}, {a: 'b'}).a, 'b', 'can extend an object with the attributes of another');
      assert.equal(_.extend({a: 'x'}, {a: 'b'}).a, 'b', 'properties in source override destination');
      assert.equal(_.extend({x: 'x'}, {a: 'b'}).x, 'x', "properties not in source don't get overridden");
      result = _.extend({x: 'x'}, {a: 'a'}, {b: 'b'});
      assert.deepEqual(result, {x: 'x', a: 'a', b: 'b'}, 'can extend from multiple source objects');
      result = _.extend({x: 'x'}, {a: 'a', x: 2}, {a: 'b'});
      assert.deepEqual(result, {x: 2, a: 'b'}, 'extending from multiple source objects last property trumps');
      result = _.extend({}, {a: void 0, b: null});
      assert.deepEqual(_.keys(result), ['a', 'b'], 'extend copies undefined values');
  
      var F = function() {};
      F.prototype = {a: 'b'};
      var subObj = new F();
      subObj.c = 'd';
      assert.deepEqual(_.extend({}, subObj), {a: 'b', c: 'd'}, 'extend copies all properties from source');
      _.extend(subObj, {});
      assert.notOk(subObj.hasOwnProperty('a'), "extend does not convert destination object's 'in' properties to 'own' properties");
  
      try {
        result = {};
        _.extend(result, null, void 0, {a: 1});
      } catch (e) { /* ignored */ }
  
      assert.equal(result.a, 1, 'should not error on `null` or `undefined` sources');
  
      assert.strictEqual(_.extend(null, {a: 1}), null, 'extending null results in null');
      assert.strictEqual(_.extend(void 0, {a: 1}), void 0, 'extending undefined results in undefined');
    });
  
    QUnit.test('extendOwn', function(assert) {
      var result;
      assert.equal(_.extendOwn({}, {a: 'b'}).a, 'b', 'can extend an object with the attributes of another');
      assert.equal(_.extendOwn({a: 'x'}, {a: 'b'}).a, 'b', 'properties in source override destination');
      assert.equal(_.extendOwn({x: 'x'}, {a: 'b'}).x, 'x', "properties not in source don't get overridden");
      result = _.extendOwn({x: 'x'}, {a: 'a'}, {b: 'b'});
      assert.deepEqual(result, {x: 'x', a: 'a', b: 'b'}, 'can extend from multiple source objects');
      result = _.extendOwn({x: 'x'}, {a: 'a', x: 2}, {a: 'b'});
      assert.deepEqual(result, {x: 2, a: 'b'}, 'extending from multiple source objects last property trumps');
      assert.deepEqual(_.extendOwn({}, {a: void 0, b: null}), {a: void 0, b: null}, 'copies undefined values');
  
      var F = function() {};
      F.prototype = {a: 'b'};
      var subObj = new F();
      subObj.c = 'd';
      assert.deepEqual(_.extendOwn({}, subObj), {c: 'd'}, 'copies own properties from source');
  
      result = {};
      assert.deepEqual(_.extendOwn(result, null, void 0, {a: 1}), {a: 1}, 'should not error on `null` or `undefined` sources');
  
      _.each(['a', 5, null, false], function(val) {
        assert.strictEqual(_.extendOwn(val, {a: 1}), val, 'extending non-objects results in returning the non-object value');
      });
  
      assert.strictEqual(_.extendOwn(void 0, {a: 1}), void 0, 'extending undefined results in undefined');
  
      result = _.extendOwn({a: 1, 0: 2, 1: '5', length: 6}, {0: 1, 1: 2, length: 2});
      assert.deepEqual(result, {a: 1, 0: 1, 1: 2, length: 2}, 'should treat array-like objects like normal objects');
    });
  
    QUnit.test('assign', function(assert) {
      assert.strictEqual(_.assign, _.extendOwn, 'is an alias for extendOwn');
    });
  
    QUnit.test('pick', function(assert) {
      var result;
      result = _.pick({a: 1, b: 2, c: 3}, 'a', 'c');
      assert.deepEqual(result, {a: 1, c: 3}, 'can restrict properties to those named');
      result = _.pick({a: 1, b: 2, c: 3}, ['b', 'c']);
      assert.deepEqual(result, {b: 2, c: 3}, 'can restrict properties to those named in an array');
      result = _.pick({a: 1, b: 2, c: 3}, ['a'], 'b');
      assert.deepEqual(result, {a: 1, b: 2}, 'can restrict properties to those named in mixed args');
      result = _.pick(['a', 'b'], 1);
      assert.deepEqual(result, {1: 'b'}, 'can pick numeric properties');
  
      _.each([null, void 0], function(val) {
        assert.deepEqual(_.pick(val, 'hasOwnProperty'), {}, 'Called with null/undefined');
        assert.deepEqual(_.pick(val, _.constant(true)), {});
      });
      assert.deepEqual(_.pick(5, 'toString', 'b'), {toString: Number.prototype.toString}, 'can iterate primitives');
  
      var data = {a: 1, b: 2, c: 3};
      var callback = function(value, key, object) {
        assert.strictEqual(key, {1: 'a', 2: 'b', 3: 'c'}[value]);
        assert.strictEqual(object, data);
        return value !== this.value;
      };
      result = _.pick(data, callback, {value: 2});
      assert.deepEqual(result, {a: 1, c: 3}, 'can accept a predicate and context');
  
      var Obj = function(){};
      Obj.prototype = {a: 1, b: 2, c: 3};
      var instance = new Obj();
      assert.deepEqual(_.pick(instance, 'a', 'c'), {a: 1, c: 3}, 'include prototype props');
  
      assert.deepEqual(_.pick(data, function(val, key) {
        return this[key] === 3 && this === instance;
      }, instance), {c: 3}, 'function is given context');
  
      assert.notOk(_.has(_.pick({}, 'foo'), 'foo'), 'does not set own property if property not in object');
      _.pick(data, function(value, key, obj) {
        assert.equal(obj, data, 'passes same object as third parameter of iteratee');
      });
    });
  
    QUnit.test('omit', function(assert) {
      var result;
      result = _.omit({a: 1, b: 2, c: 3}, 'b');
      assert.deepEqual(result, {a: 1, c: 3}, 'can omit a single named property');
      result = _.omit({a: 1, b: 2, c: 3}, 'a', 'c');
      assert.deepEqual(result, {b: 2}, 'can omit several named properties');
      result = _.omit({a: 1, b: 2, c: 3}, ['b', 'c']);
      assert.deepEqual(result, {a: 1}, 'can omit properties named in an array');
      result = _.omit(['a', 'b'], 0);
      assert.deepEqual(result, {1: 'b'}, 'can omit numeric properties');
  
      assert.deepEqual(_.omit(null, 'a', 'b'), {}, 'non objects return empty object');
      assert.deepEqual(_.omit(void 0, 'toString'), {}, 'null/undefined return empty object');
      assert.deepEqual(_.omit(5, 'toString', 'b'), {}, 'returns empty object for primitives');
  
      var data = {a: 1, b: 2, c: 3};
      var callback = function(value, key, object) {
        assert.strictEqual(key, {1: 'a', 2: 'b', 3: 'c'}[value]);
        assert.strictEqual(object, data);
        return value !== this.value;
      };
      result = _.omit(data, callback, {value: 2});
      assert.deepEqual(result, {b: 2}, 'can accept a predicate');
  
      var Obj = function(){};
      Obj.prototype = {a: 1, b: 2, c: 3};
      var instance = new Obj();
      assert.deepEqual(_.omit(instance, 'b'), {a: 1, c: 3}, 'include prototype props');
  
      assert.deepEqual(_.omit(data, function(val, key) {
        return this[key] === 3 && this === instance;
      }, instance), {a: 1, b: 2}, 'function is given context');
    });
  
    QUnit.test('defaults', function(assert) {
      var options = {zero: 0, one: 1, empty: '', nan: NaN, nothing: null};
  
      _.defaults(options, {zero: 1, one: 10, twenty: 20, nothing: 'str'});
      assert.equal(options.zero, 0, 'value exists');
      assert.equal(options.one, 1, 'value exists');
      assert.equal(options.twenty, 20, 'default applied');
      assert.equal(options.nothing, null, "null isn't overridden");
  
      _.defaults(options, {empty: 'full'}, {nan: 'nan'}, {word: 'word'}, {word: 'dog'});
      assert.equal(options.empty, '', 'value exists');
      assert.ok(_.isNaN(options.nan), "NaN isn't overridden");
      assert.equal(options.word, 'word', 'new value is added, first one wins');
  
      try {
        options = {};
        _.defaults(options, null, void 0, {a: 1});
      } catch (e) { /* ignored */ }
  
      assert.equal(options.a, 1, 'should not error on `null` or `undefined` sources');
  
      assert.deepEqual(_.defaults(null, {a: 1}), {a: 1}, 'defaults skips nulls');
      assert.deepEqual(_.defaults(void 0, {a: 1}), {a: 1}, 'defaults skips undefined');
    });
  
    QUnit.test('clone', function(assert) {
      var moe = {name: 'moe', lucky: [13, 27, 34]};
      var clone = _.clone(moe);
      assert.equal(clone.name, 'moe', 'the clone as the attributes of the original');
  
      clone.name = 'curly';
      assert.ok(clone.name === 'curly' && moe.name === 'moe', 'clones can change shallow attributes without affecting the original');
  
      clone.lucky.push(101);
      assert.equal(_.last(moe.lucky), 101, 'changes to deep attributes are shared with the original');
  
      assert.equal(_.clone(void 0), void 0, 'non objects should not be changed by clone');
      assert.equal(_.clone(1), 1, 'non objects should not be changed by clone');
      assert.equal(_.clone(null), null, 'non objects should not be changed by clone');
    });
  
    QUnit.test('create', function(assert) {
      var Parent = function() {};
      Parent.prototype = {foo: function() {}, bar: 2};
  
      _.each(['foo', null, void 0, 1], function(val) {
        assert.deepEqual(_.create(val), {}, 'should return empty object when a non-object is provided');
      });
  
      assert.ok(_.create([]) instanceof Array, 'should return new instance of array when array is provided');
  
      var Child = function() {};
      Child.prototype = _.create(Parent.prototype);
      assert.ok(new Child instanceof Parent, 'object should inherit prototype');
  
      var func = function() {};
      Child.prototype = _.create(Parent.prototype, {func: func});
      assert.strictEqual(Child.prototype.func, func, 'properties should be added to object');
  
      Child.prototype = _.create(Parent.prototype, {constructor: Child});
      assert.strictEqual(Child.prototype.constructor, Child);
  
      Child.prototype.foo = 'foo';
      var created = _.create(Child.prototype, new Child);
      assert.notOk(created.hasOwnProperty('foo'), 'should only add own properties');
    });
  
    QUnit.test('isEqual', function(assert) {
      function First() {
        this.value = 1;
      }
      First.prototype.value = 1;
      function Second() {
        this.value = 1;
      }
      Second.prototype.value = 2;
  
      // Basic equality and identity comparisons.
      assert.ok(_.isEqual(null, null), '`null` is equal to `null`');
      assert.ok(_.isEqual(), '`undefined` is equal to `undefined`');
  
      assert.notOk(_.isEqual(0, -0), '`0` is not equal to `-0`');
      assert.notOk(_.isEqual(-0, 0), 'Commutative equality is implemented for `0` and `-0`');
      assert.notOk(_.isEqual(null, void 0), '`null` is not equal to `undefined`');
      assert.notOk(_.isEqual(void 0, null), 'Commutative equality is implemented for `null` and `undefined`');
  
      // String object and primitive comparisons.
      assert.ok(_.isEqual('Curly', 'Curly'), 'Identical string primitives are equal');
      assert.ok(_.isEqual(new String('Curly'), new String('Curly')), 'String objects with identical primitive values are equal');
      assert.ok(_.isEqual(new String('Curly'), 'Curly'), 'String primitives and their corresponding object wrappers are equal');
      assert.ok(_.isEqual('Curly', new String('Curly')), 'Commutative equality is implemented for string objects and primitives');
  
      assert.notOk(_.isEqual('Curly', 'Larry'), 'String primitives with different values are not equal');
      assert.notOk(_.isEqual(new String('Curly'), new String('Larry')), 'String objects with different primitive values are not equal');
      assert.notOk(_.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.
      assert.ok(_.isEqual(75, 75), 'Identical number primitives are equal');
      assert.ok(_.isEqual(new Number(75), new Number(75)), 'Number objects with identical primitive values are equal');
      assert.ok(_.isEqual(75, new Number(75)), 'Number primitives and their corresponding object wrappers are equal');
      assert.ok(_.isEqual(new Number(75), 75), 'Commutative equality is implemented for number objects and primitives');
      assert.notOk(_.isEqual(new Number(0), -0), '`new Number(0)` and `-0` are not equal');
      assert.notOk(_.isEqual(0, new Number(-0)), 'Commutative equality is implemented for `new Number(0)` and `-0`');
  
      assert.notOk(_.isEqual(new Number(75), new Number(63)), 'Number objects with different primitive values are not equal');
      assert.notOk(_.isEqual(new Number(63), {valueOf: function(){ return 63; }}), 'Number objects and objects with a `valueOf` method are not equal');
  
      // Comparisons involving `NaN`.
      assert.ok(_.isEqual(NaN, NaN), '`NaN` is equal to `NaN`');
      assert.ok(_.isEqual(new Number(NaN), NaN), 'Object(`NaN`) is equal to `NaN`');
      assert.notOk(_.isEqual(61, NaN), 'A number primitive is not equal to `NaN`');
      assert.notOk(_.isEqual(new Number(79), NaN), 'A number object is not equal to `NaN`');
      assert.notOk(_.isEqual(Infinity, NaN), '`Infinity` is not equal to `NaN`');
  
      // Boolean object and primitive comparisons.
      assert.ok(_.isEqual(true, true), 'Identical boolean primitives are equal');
      assert.ok(_.isEqual(new Boolean, new Boolean), 'Boolean objects with identical primitive values are equal');
      assert.ok(_.isEqual(true, new Boolean(true)), 'Boolean primitives and their corresponding object wrappers are equal');
      assert.ok(_.isEqual(new Boolean(true), true), 'Commutative equality is implemented for booleans');
      assert.notOk(_.isEqual(new Boolean(true), new Boolean), 'Boolean objects with different primitive values are not equal');
  
      // Common type coercions.
      assert.notOk(_.isEqual(new Boolean(false), true), '`new Boolean(false)` is not equal to `true`');
      assert.notOk(_.isEqual('75', 75), 'String and number primitives with like values are not equal');
      assert.notOk(_.isEqual(new Number(63), new String(63)), 'String and number objects with like values are not equal');
      assert.notOk(_.isEqual(75, '75'), 'Commutative equality is implemented for like string and number values');
      assert.notOk(_.isEqual(0, ''), 'Number and string primitives with like values are not equal');
      assert.notOk(_.isEqual(1, true), 'Number and boolean primitives with like values are not equal');
      assert.notOk(_.isEqual(new Boolean(false), new Number(0)), 'Boolean and number objects with like values are not equal');
      assert.notOk(_.isEqual(false, new String('')), 'Boolean primitives and string objects with like values are not equal');
      assert.notOk(_.isEqual(12564504e5, new Date(2009, 9, 25)), 'Dates and their corresponding numeric primitive values are not equal');
  
      // Dates.
      assert.ok(_.isEqual(new Date(2009, 9, 25), new Date(2009, 9, 25)), 'Date objects referencing identical times are equal');
      assert.notOk(_.isEqual(new Date(2009, 9, 25), new Date(2009, 11, 13)), 'Date objects referencing different times are not equal');
      assert.notOk(_.isEqual(new Date(2009, 11, 13), {
        getTime: function(){
          return 12606876e5;
        }
      }), 'Date objects and objects with a `getTime` method are not equal');
      assert.notOk(_.isEqual(new Date('Curly'), new Date('Curly')), 'Invalid dates are not equal');
  
      // Functions.
      assert.notOk(_.isEqual(First, Second), 'Different functions with identical bodies and source code representations are not equal');
  
      // RegExps.
      assert.ok(_.isEqual(/(?:)/gim, /(?:)/gim), 'RegExps with equivalent patterns and flags are equal');
      assert.ok(_.isEqual(/(?:)/gi, /(?:)/ig), 'Flag order is not significant');
      assert.notOk(_.isEqual(/(?:)/g, /(?:)/gi), 'RegExps with equivalent patterns and different flags are not equal');
      assert.notOk(_.isEqual(/Moe/gim, /Curly/gim), 'RegExps with different patterns and equivalent flags are not equal');
      assert.notOk(_.isEqual(/(?:)/gi, /(?:)/g), 'Commutative equality is implemented for RegExps');
      assert.notOk(_.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.
      assert.ok(_.isEqual({}, {}), 'Empty object literals are equal');
      assert.ok(_.isEqual([], []), 'Empty array literals are equal');
      assert.ok(_.isEqual([{}], [{}]), 'Empty nested arrays and objects are equal');
      assert.notOk(_.isEqual({length: 0}, []), 'Array-like objects and arrays are not equal.');
      assert.notOk(_.isEqual([], {length: 0}), 'Commutative equality is implemented for array-like objects');
  
      assert.notOk(_.isEqual({}, []), 'Object literals and array literals are not equal');
      assert.notOk(_.isEqual([], {}), 'Commutative equality is implemented for objects and arrays');
  
      // Arrays with primitive and object values.
      assert.ok(_.isEqual([1, 'Larry', true], [1, 'Larry', true]), 'Arrays containing identical primitives are equal');
      assert.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}];
      assert.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.
      assert.ok(_.isEqual(a, b), 'Arrays containing equivalent elements and different non-numeric properties are equal');
      a.push('White Rocks');
      assert.notOk(_.isEqual(a, b), 'Arrays of different lengths are not equal');
      a.push('East Boulder');
      b.push('Gunbarrel Ranch', 'Teller Farm');
      assert.notOk(_.isEqual(a, b), 'Arrays of identical lengths containing different elements are not equal');
  
      // Sparse arrays.
      assert.ok(_.isEqual(Array(3), Array(3)), 'Sparse arrays of identical lengths are equal');
      assert.notOk(_.isEqual(Array(3), Array(6)), 'Sparse arrays of different lengths are not equal when both are empty');
  
      var sparse = [];
      sparse[1] = 5;
      assert.ok(_.isEqual(sparse, [void 0, 5]), 'Handles sparse arrays as dense');
  
      // Simple objects.
      assert.ok(_.isEqual({a: 'Curly', b: 1, c: true}, {a: 'Curly', b: 1, c: true}), 'Objects containing identical primitives are equal');
      assert.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');
      assert.notOk(_.isEqual({a: 63, b: 75}, {a: 61, b: 55}), 'Objects of identical sizes with different values are not equal');
      assert.notOk(_.isEqual({a: 63, b: 75}, {a: 61, c: 55}), 'Objects of identical sizes with different property names are not equal');
      assert.notOk(_.isEqual({a: 1, b: 2}, {a: 1}), 'Objects of different sizes are not equal');
      assert.notOk(_.isEqual({a: 1}, {a: 1, b: 2}), 'Commutative equality is implemented for objects');
      assert.notOk(_.isEqual({x: 1, y: void 0}, {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
        }
      };
      assert.ok(_.isEqual(a, b), 'Objects with nested equivalent members are recursively compared');
  
      // Instances.
      assert.ok(_.isEqual(new First, new First), 'Object instances are equal');
      assert.notOk(_.isEqual(new First, new Second), 'Objects with different constructors and identical own properties are not equal');
      assert.notOk(_.isEqual({value: 1}, new First), 'Object instances and objects sharing equivalent properties are not equal');
      assert.notOk(_.isEqual({value: 2}, new Second), 'The prototype chain of objects should not be examined');
  
      // Circular Arrays.
      (a = []).push(a);
      (b = []).push(b);
      assert.ok(_.isEqual(a, b), 'Arrays containing circular references are equal');
      a.push(new String('Larry'));
      b.push(new String('Larry'));
      assert.ok(_.isEqual(a, b), 'Arrays containing circular references and equivalent properties are equal');
      a.push('Shemp');
      b.push('Curly');
      assert.notOk(_.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'];
      assert.notOk(_.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;
      assert.ok(_.isEqual(a, b), 'Objects containing circular references are equal');
      a.def = 75;
      b.def = 75;
      assert.ok(_.isEqual(a, b), 'Objects containing circular references and equivalent properties are equal');
      a.def = new Number(75);
      b.def = new Number(63);
      assert.notOk(_.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'};
      assert.notOk(_.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);
      assert.ok(_.isEqual(a, b), 'Cyclic structures are equal');
      a[0].def = 'Larry';
      b[0].def = 'Larry';
      assert.ok(_.isEqual(a, b), 'Cyclic structures containing equivalent properties are equal');
      a[0].def = new String('Larry');
      b[0].def = new String('Curly');
      assert.notOk(_.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;
      assert.ok(_.isEqual(a, b), 'Cyclic structures with nested and identically-named properties are equal');
  
      // Chaining.
      assert.notOk(_.isEqual(_({x: 1, y: void 0}).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();
      assert.equal(_.isEqual(a.isEqual(b), _(true)), true, '`isEqual` can be chained');
  
      // Objects without a `constructor` property
      if (Object.create) {
        a = Object.create(null, {x: {value: 1, enumerable: true}});
        b = {x: 1};
        assert.ok(_.isEqual(a, b), 'Handles objects without a constructor (e.g. from Object.create');
      }
  
      function Foo() { this.a = 1; }
      Foo.prototype.constructor = null;
  
      var other = {a: 1};
      assert.strictEqual(_.isEqual(new Foo, other), false, 'Objects from different constructors are not equal');
  
  
      // Tricky object cases val comparisions
      assert.equal(_.isEqual([0], [-0]), false);
      assert.equal(_.isEqual({a: 0}, {a: -0}), false);
      assert.equal(_.isEqual([NaN], [NaN]), true);
      assert.equal(_.isEqual({a: NaN}, {a: NaN}), true);
  
      if (typeof Symbol !== 'undefined') {
        var symbol = Symbol('x');
        assert.strictEqual(_.isEqual(symbol, symbol), true, 'A symbol is equal to itself');
        assert.strictEqual(_.isEqual(symbol, Object(symbol)), true, 'Even when wrapped in Object()');
        assert.strictEqual(_.isEqual(symbol, null), false, 'Different types are not equal');
      }
  
    });
  
    QUnit.test('isEmpty', function(assert) {
      assert.notOk(_([1]).isEmpty(), '[1] is not empty');
      assert.ok(_.isEmpty([]), '[] is empty');
      assert.notOk(_.isEmpty({one: 1}), '{one: 1} is not empty');
      assert.ok(_.isEmpty({}), '{} is empty');
      assert.ok(_.isEmpty(new RegExp('')), 'objects with prototype properties are empty');
      assert.ok(_.isEmpty(null), 'null is empty');
      assert.ok(_.isEmpty(), 'undefined is empty');
      assert.ok(_.isEmpty(''), 'the empty string is empty');
      assert.notOk(_.isEmpty('moe'), 'but other strings are not');
  
      var obj = {one: 1};
      delete obj.one;
      assert.ok(_.isEmpty(obj), 'deleting all the keys from an object empties it');
  
      var args = function(){ return arguments; };
      assert.ok(_.isEmpty(args()), 'empty arguments object is empty');
      assert.notOk(_.isEmpty(args('')), 'non-empty arguments object is not empty');
  
      // covers collecting non-enumerable properties in IE < 9
      var nonEnumProp = {toString: 5};
      assert.notOk(_.isEmpty(nonEnumProp), 'non-enumerable property is not empty');
    });
  
    if (typeof document === 'object') {
      QUnit.test('isElement', function(assert) {
        assert.notOk(_.isElement('div'), 'strings are not dom elements');
        assert.ok(_.isElement(testElement), 'an element is a DOM element');
      });
    }
  
    QUnit.test('isArguments', function(assert) {
      var args = (function(){ return arguments; }(1, 2, 3));
      assert.notOk(_.isArguments('string'), 'a string is not an arguments object');
      assert.notOk(_.isArguments(_.isArguments), 'a function is not an arguments object');
      assert.ok(_.isArguments(args), 'but the arguments object is an arguments object');
      assert.notOk(_.isArguments(_.toArray(args)), 'but not when it\'s converted into an array');
      assert.notOk(_.isArguments([1, 2, 3]), 'and not vanilla arrays.');
    });
  
    QUnit.test('isObject', function(assert) {
      assert.ok(_.isObject(arguments), 'the arguments object is object');
      assert.ok(_.isObject([1, 2, 3]), 'and arrays');
      if (testElement) {
        assert.ok(_.isObject(testElement), 'and DOM element');
      }
      assert.ok(_.isObject(function() {}), 'and functions');
      assert.notOk(_.isObject(null), 'but not null');
      assert.notOk(_.isObject(void 0), 'and not undefined');
      assert.notOk(_.isObject('string'), 'and not string');
      assert.notOk(_.isObject(12), 'and not number');
      assert.notOk(_.isObject(true), 'and not boolean');
      assert.ok(_.isObject(new String('string')), 'but new String()');
    });
  
    QUnit.test('isArray', function(assert) {
      assert.notOk(_.isArray(void 0), 'undefined vars are not arrays');
      assert.notOk(_.isArray(arguments), 'the arguments object is not an array');
      assert.ok(_.isArray([1, 2, 3]), 'but arrays are');
    });
  
    QUnit.test('isString', function(assert) {
      var obj = new String('I am a string object');
      if (testElement) {
        assert.notOk(_.isString(testElement), 'an element is not a string');
      }
      assert.ok(_.isString([1, 2, 3].join(', ')), 'but strings are');
      assert.strictEqual(_.isString('I am a string literal'), true, 'string literals are');
      assert.ok(_.isString(obj), 'so are String objects');
      assert.strictEqual(_.isString(1), false);
    });
  
    QUnit.test('isSymbol', function(assert) {
      assert.notOk(_.isSymbol(0), 'numbers are not symbols');
      assert.notOk(_.isSymbol(''), 'strings are not symbols');
      assert.notOk(_.isSymbol(_.isSymbol), 'functions are not symbols');
      if (typeof Symbol === 'function') {
        assert.ok(_.isSymbol(Symbol()), 'symbols are symbols');
        assert.ok(_.isSymbol(Symbol('description')), 'described symbols are symbols');
        assert.ok(_.isSymbol(Object(Symbol())), 'boxed symbols are symbols');
      }
    });
  
    QUnit.test('isNumber', function(assert) {
      assert.notOk(_.isNumber('string'), 'a string is not a number');
      assert.notOk(_.isNumber(arguments), 'the arguments object is not a number');
      assert.notOk(_.isNumber(void 0), 'undefined is not a number');
      assert.ok(_.isNumber(3 * 4 - 7 / 10), 'but numbers are');
      assert.ok(_.isNumber(NaN), 'NaN *is* a number');
      assert.ok(_.isNumber(Infinity), 'Infinity is a number');
      assert.notOk(_.isNumber('1'), 'numeric strings are not numbers');
    });
  
    QUnit.test('isBoolean', function(assert) {
      assert.notOk(_.isBoolean(2), 'a number is not a boolean');
      assert.notOk(_.isBoolean('string'), 'a string is not a boolean');
      assert.notOk(_.isBoolean('false'), 'the string "false" is not a boolean');
      assert.notOk(_.isBoolean('true'), 'the string "true" is not a boolean');
      assert.notOk(_.isBoolean(arguments), 'the arguments object is not a boolean');
      assert.notOk(_.isBoolean(void 0), 'undefined is not a boolean');
      assert.notOk(_.isBoolean(NaN), 'NaN is not a boolean');
      assert.notOk(_.isBoolean(null), 'null is not a boolean');
      assert.ok(_.isBoolean(true), 'but true is');
      assert.ok(_.isBoolean(false), 'and so is false');
    });
  
    QUnit.test('isMap', function(assert) {
      assert.notOk(_.isMap('string'), 'a string is not a map');
      assert.notOk(_.isMap(2), 'a number is not a map');
      assert.notOk(_.isMap({}), 'an object is not a map');
      assert.notOk(_.isMap(false), 'a boolean is not a map');
      assert.notOk(_.isMap(void 0), 'undefined is not a map');
      assert.notOk(_.isMap([1, 2, 3]), 'an array is not a map');
      if (typeof Set === 'function') {
        assert.notOk(_.isMap(new Set()), 'a set is not a map');
      }
      if (typeof WeakSet === 'function') {
        assert.notOk(_.isMap(new WeakSet()), 'a weakset is not a map');
      }
      if (typeof WeakMap === 'function') {
        assert.notOk(_.isMap(new WeakMap()), 'a weakmap is not a map');
      }
      if (typeof Map === 'function') {
        var keyString = 'a string';
        var obj = new Map();
        obj.set(keyString, 'value');
        assert.ok(_.isMap(obj), 'but a map is');
      }
    });
  
    QUnit.test('isWeakMap', function(assert) {
      assert.notOk(_.isWeakMap('string'), 'a string is not a weakmap');
      assert.notOk(_.isWeakMap(2), 'a number is not a weakmap');
      assert.notOk(_.isWeakMap({}), 'an object is not a weakmap');
      assert.notOk(_.isWeakMap(false), 'a boolean is not a weakmap');
      assert.notOk(_.isWeakMap(void 0), 'undefined is not a weakmap');
      assert.notOk(_.isWeakMap([1, 2, 3]), 'an array is not a weakmap');
      if (typeof Set === 'function') {
        assert.notOk(_.isWeakMap(new Set()), 'a set is not a weakmap');
      }
      if (typeof WeakSet === 'function') {
        assert.notOk(_.isWeakMap(new WeakSet()), 'a weakset is not a weakmap');
      }
      if (typeof Map === 'function') {
        assert.notOk(_.isWeakMap(new Map()), 'a map is not a weakmap');
      }
      if (typeof WeakMap === 'function') {
        var keyObj = {}, obj = new WeakMap();
        obj.set(keyObj, 'value');
        assert.ok(_.isWeakMap(obj), 'but a weakmap is');
      }
    });
  
    QUnit.test('isSet', function(assert) {
      assert.notOk(_.isSet('string'), 'a string is not a set');
      assert.notOk(_.isSet(2), 'a number is not a set');
      assert.notOk(_.isSet({}), 'an object is not a set');
      assert.notOk(_.isSet(false), 'a boolean is not a set');
      assert.notOk(_.isSet(void 0), 'undefined is not a set');
      assert.notOk(_.isSet([1, 2, 3]), 'an array is not a set');
      if (typeof Map === 'function') {
        assert.notOk(_.isSet(new Map()), 'a map is not a set');
      }
      if (typeof WeakMap === 'function') {
        assert.notOk(_.isSet(new WeakMap()), 'a weakmap is not a set');
      }
      if (typeof WeakSet === 'function') {
        assert.notOk(_.isSet(new WeakSet()), 'a weakset is not a set');
      }
      if (typeof Set === 'function') {
        var obj = new Set();
        obj.add(1).add('string').add(false).add({});
        assert.ok(_.isSet(obj), 'but a set is');
      }
    });
  
    QUnit.test('isWeakSet', function(assert) {
  
      assert.notOk(_.isWeakSet('string'), 'a string is not a weakset');
      assert.notOk(_.isWeakSet(2), 'a number is not a weakset');
      assert.notOk(_.isWeakSet({}), 'an object is not a weakset');
      assert.notOk(_.isWeakSet(false), 'a boolean is not a weakset');
      assert.notOk(_.isWeakSet(void 0), 'undefined is not a weakset');
      assert.notOk(_.isWeakSet([1, 2, 3]), 'an array is not a weakset');
      if (typeof Map === 'function') {
        assert.notOk(_.isWeakSet(new Map()), 'a map is not a weakset');
      }
      if (typeof WeakMap === 'function') {
        assert.notOk(_.isWeakSet(new WeakMap()), 'a weakmap is not a weakset');
      }
      if (typeof Set === 'function') {
        assert.notOk(_.isWeakSet(new Set()), 'a set is not a weakset');
      }
      if (typeof WeakSet === 'function') {
        var obj = new WeakSet();
        obj.add({x: 1}, {y: 'string'}).add({y: 'string'}).add({z: [1, 2, 3]});
        assert.ok(_.isWeakSet(obj), 'but a weakset is');
      }
    });
  
    QUnit.test('isFunction', function(assert) {
      assert.notOk(_.isFunction(void 0), 'undefined vars are not functions');
      assert.notOk(_.isFunction([1, 2, 3]), 'arrays are not functions');
      assert.notOk(_.isFunction('moe'), 'strings are not functions');
      assert.ok(_.isFunction(_.isFunction), 'but functions are');
      assert.ok(_.isFunction(function(){}), 'even anonymous ones');
  
      if (testElement) {
        assert.notOk(_.isFunction(testElement), 'elements are not functions');
      }
  
      var nodelist = typeof document != 'undefined' && document.childNodes;
      if (nodelist) {
        assert.notOk(_.isFunction(nodelist));
      }
    });
  
    if (typeof Int8Array !== 'undefined') {
      QUnit.test('#1929 Typed Array constructors are functions', function(assert) {
        _.chain(['Float32Array', 'Float64Array', 'Int8Array', 'Int16Array', 'Int32Array', 'Uint8Array', 'Uint8ClampedArray', 'Uint16Array', 'Uint32Array'])
        .map(_.propertyOf(typeof GLOBAL != 'undefined' ? GLOBAL : window))
        .compact()
        .each(function(TypedArray) {
          // PhantomJS reports `typeof UInt8Array == 'object'` and doesn't report toString TypeArray
          // as a function
          assert.strictEqual(_.isFunction(TypedArray), Object.prototype.toString.call(TypedArray) === '[object Function]');
        });
      });
    }
  
    QUnit.test('isDate', function(assert) {
      assert.notOk(_.isDate(100), 'numbers are not dates');
      assert.notOk(_.isDate({}), 'objects are not dates');
      assert.ok(_.isDate(new Date()), 'but dates are');
    });
  
    QUnit.test('isRegExp', function(assert) {
      assert.notOk(_.isRegExp(_.identity), 'functions are not RegExps');
      assert.ok(_.isRegExp(/identity/), 'but RegExps are');
    });
  
    QUnit.test('isFinite', function(assert) {
      assert.notOk(_.isFinite(void 0), 'undefined is not finite');
      assert.notOk(_.isFinite(null), 'null is not finite');
      assert.notOk(_.isFinite(NaN), 'NaN is not finite');
      assert.notOk(_.isFinite(Infinity), 'Infinity is not finite');
      assert.notOk(_.isFinite(-Infinity), '-Infinity is not finite');
      assert.ok(_.isFinite('12'), 'Numeric strings are numbers');
      assert.notOk(_.isFinite('1a'), 'Non numeric strings are not numbers');
      assert.notOk(_.isFinite(''), 'Empty strings are not numbers');
      var obj = new Number(5);
      assert.ok(_.isFinite(obj), 'Number instances can be finite');
      assert.ok(_.isFinite(0), '0 is finite');
      assert.ok(_.isFinite(123), 'Ints are finite');
      assert.ok(_.isFinite(-12.44), 'Floats are finite');
      if (typeof Symbol === 'function') {
        assert.notOk(_.isFinite(Symbol()), 'symbols are not numbers');
        assert.notOk(_.isFinite(Symbol('description')), 'described symbols are not numbers');
        assert.notOk(_.isFinite(Object(Symbol())), 'boxed symbols are not numbers');
      }
    });
  
    QUnit.test('isNaN', function(assert) {
      assert.notOk(_.isNaN(void 0), 'undefined is not NaN');
      assert.notOk(_.isNaN(null), 'null is not NaN');
      assert.notOk(_.isNaN(0), '0 is not NaN');
      assert.notOk(_.isNaN(new Number(0)), 'wrapped 0 is not NaN');
      assert.ok(_.isNaN(NaN), 'but NaN is');
      assert.ok(_.isNaN(new Number(NaN)), 'wrapped NaN is still NaN');
      if (typeof Symbol !== 'undefined'){
        assert.notOk(_.isNaN(Symbol()), 'symbol is not NaN');
      }
    });
  
    QUnit.test('isNull', function(assert) {
      assert.notOk(_.isNull(void 0), 'undefined is not null');
      assert.notOk(_.isNull(NaN), 'NaN is not null');
      assert.ok(_.isNull(null), 'but null is');
    });
  
    QUnit.test('isUndefined', function(assert) {
      assert.notOk(_.isUndefined(1), 'numbers are defined');
      assert.notOk(_.isUndefined(null), 'null is defined');
      assert.notOk(_.isUndefined(false), 'false is defined');
      assert.notOk(_.isUndefined(NaN), 'NaN is defined');
      assert.ok(_.isUndefined(), 'nothing is undefined');
      assert.ok(_.isUndefined(void 0), 'undefined is undefined');
    });
  
    QUnit.test('isError', function(assert) {
      assert.notOk(_.isError(1), 'numbers are not Errors');
      assert.notOk(_.isError(null), 'null is not an Error');
      assert.notOk(_.isError(Error), 'functions are not Errors');
      assert.ok(_.isError(new Error()), 'Errors are Errors');
      assert.ok(_.isError(new EvalError()), 'EvalErrors are Errors');
      assert.ok(_.isError(new RangeError()), 'RangeErrors are Errors');
      assert.ok(_.isError(new ReferenceError()), 'ReferenceErrors are Errors');
      assert.ok(_.isError(new SyntaxError()), 'SyntaxErrors are Errors');
      assert.ok(_.isError(new TypeError()), 'TypeErrors are Errors');
      assert.ok(_.isError(new URIError()), 'URIErrors are Errors');
    });
  
    QUnit.test('tap', function(assert) {
      var intercepted = null;
      var interceptor = function(obj) { intercepted = obj; };
      var returned = _.tap(1, interceptor);
      assert.equal(intercepted, 1, 'passes tapped object to interceptor');
      assert.equal(returned, 1, 'returns tapped object');
  
      returned = _([1, 2, 3]).chain().
        map(function(n){ return n * 2; }).
        max().
        tap(interceptor).
        value();
      assert.equal(returned, 6, 'can use tapped objects in a chain');
      assert.equal(intercepted, returned, 'can use tapped objects in a chain');
    });
  
    QUnit.test('has', function(assert) {
      var obj = {foo: 'bar', func: function(){}};
      assert.ok(_.has(obj, 'foo'), 'has() checks that the object has a property.');
      assert.notOk(_.has(obj, 'baz'), "has() returns false if the object doesn't have the property.");
      assert.ok(_.has(obj, 'func'), 'has() works for functions too.');
      obj.hasOwnProperty = null;
      assert.ok(_.has(obj, 'foo'), 'has() works even when the hasOwnProperty method is deleted.');
      var child = {};
      child.prototype = obj;
      assert.notOk(_.has(child, 'foo'), 'has() does not check the prototype chain for a property.');
      assert.strictEqual(_.has(null, 'foo'), false, 'has() returns false for null');
      assert.strictEqual(_.has(void 0, 'foo'), false, 'has() returns false for undefined');
    });
  
    QUnit.test('isMatch', function(assert) {
      var moe = {name: 'Moe Howard', hair: true};
      var curly = {name: 'Curly Howard', hair: false};
  
      assert.equal(_.isMatch(moe, {hair: true}), true, 'Returns a boolean');
      assert.equal(_.isMatch(curly, {hair: true}), false, 'Returns a boolean');
  
      assert.equal(_.isMatch(5, {__x__: void 0}), false, 'can match undefined props on primitives');
      assert.equal(_.isMatch({__x__: void 0}, {__x__: void 0}), true, 'can match undefined props');
  
      assert.equal(_.isMatch(null, {}), true, 'Empty spec called with null object returns true');
      assert.equal(_.isMatch(null, {a: 1}), false, 'Non-empty spec called with null object returns false');
  
      _.each([null, void 0], function(item) { assert.strictEqual(_.isMatch(item, null), true, 'null matches null'); });
      _.each([null, void 0], function(item) { assert.strictEqual(_.isMatch(item, null), true, 'null matches {}'); });
      assert.strictEqual(_.isMatch({b: 1}, {a: void 0}), false, 'handles undefined values (1683)');
  
      _.each([true, 5, NaN, null, void 0], function(item) {
        assert.strictEqual(_.isMatch({a: 1}, item), true, 'treats primitives as empty');
      });
  
      function Prototest() {}
      Prototest.prototype.x = 1;
      var specObj = new Prototest;
      assert.equal(_.isMatch({x: 2}, specObj), true, 'spec is restricted to own properties');
  
      specObj.y = 5;
      assert.equal(_.isMatch({x: 1, y: 5}, specObj), true);
      assert.equal(_.isMatch({x: 1, y: 4}, specObj), false);
  
      assert.ok(_.isMatch(specObj, {x: 1, y: 5}), 'inherited and own properties are checked on the test object');
  
      Prototest.x = 5;
      assert.ok(_.isMatch({x: 5, y: 1}, Prototest), 'spec can be a function');
  
      //null edge cases
      var oCon = {constructor: Object};
      assert.deepEqual(_.map([null, void 0, 5, {}], _.partial(_.isMatch, _, oCon)), [false, false, false, true], 'doesnt falsey match constructor on undefined/null');
    });
  
    QUnit.test('matcher', function(assert) {
      var moe = {name: 'Moe Howard', hair: true};
      var curly = {name: 'Curly Howard', hair: false};
      var stooges = [moe, curly];
  
      assert.equal(_.matcher({hair: true})(moe), true, 'Returns a boolean');
      assert.equal(_.matcher({hair: true})(curly), false, 'Returns a boolean');
  
      assert.equal(_.matcher({__x__: void 0})(5), false, 'can match undefined props on primitives');
      assert.equal(_.matcher({__x__: void 0})({__x__: void 0}), true, 'can match undefined props');
  
      assert.equal(_.matcher({})(null), true, 'Empty spec called with null object returns true');
      assert.equal(_.matcher({a: 1})(null), false, 'Non-empty spec called with null object returns false');
  
      assert.strictEqual(_.find(stooges, _.matcher({hair: false})), curly, 'returns a predicate that can be used by finding functions.');
      assert.strictEqual(_.find(stooges, _.matcher(moe)), moe, 'can be used to locate an object exists in a collection.');
      assert.deepEqual(_.filter([null, void 0], _.matcher({a: 1})), [], 'Do not throw on null values.');
  
      assert.deepEqual(_.filter([null, void 0], _.matcher(null)), [null, void 0], 'null matches null');
      assert.deepEqual(_.filter([null, void 0], _.matcher({})), [null, void 0], 'null matches {}');
      assert.deepEqual(_.filter([{b: 1}], _.matcher({a: void 0})), [], 'handles undefined values (1683)');
  
      _.each([true, 5, NaN, null, void 0], function(item) {
        assert.equal(_.matcher(item)({a: 1}), true, 'treats primitives as empty');
      });
  
      function Prototest() {}
      Prototest.prototype.x = 1;
      var specObj = new Prototest;
      var protospec = _.matcher(specObj);
      assert.equal(protospec({x: 2}), true, 'spec is restricted to own properties');
  
      specObj.y = 5;
      protospec = _.matcher(specObj);
      assert.equal(protospec({x: 1, y: 5}), true);
      assert.equal(protospec({x: 1, y: 4}), false);
  
      assert.ok(_.matcher({x: 1, y: 5})(specObj), 'inherited and own properties are checked on the test object');
  
      Prototest.x = 5;
      assert.ok(_.matcher(Prototest)({x: 5, y: 1}), 'spec can be a function');
  
      // #1729
      var o = {b: 1};
      var m = _.matcher(o);
  
      assert.equal(m({b: 1}), true);
      o.b = 2;
      o.a = 1;
      assert.equal(m({b: 1}), true, 'changing spec object doesnt change matches result');
  
  
      //null edge cases
      var oCon = _.matcher({constructor: Object});
      assert.deepEqual(_.map([null, void 0, 5, {}], oCon), [false, false, false, true], 'doesnt falsey match constructor on undefined/null');
    });
  
    QUnit.test('matches', function(assert) {
      assert.strictEqual(_.matches, _.matcher, 'is an alias for matcher');
    });
  
    QUnit.test('findKey', function(assert) {
      var objects = {
        a: {a: 0, b: 0},
        b: {a: 1, b: 1},
        c: {a: 2, b: 2}
      };
  
      assert.equal(_.findKey(objects, function(obj) {
        return obj.a === 0;
      }), 'a');
  
      assert.equal(_.findKey(objects, function(obj) {
        return obj.b * obj.a === 4;
      }), 'c');
  
      assert.equal(_.findKey(objects, 'a'), 'b', 'Uses lookupIterator');
  
      assert.equal(_.findKey(objects, function(obj) {
        return obj.b * obj.a === 5;
      }), void 0);
  
      assert.strictEqual(_.findKey([1, 2, 3, 4, 5, 6], function(obj) {
        return obj === 3;
      }), '2', 'Keys are strings');
  
      assert.strictEqual(_.findKey(objects, function(a) {
        return a.foo === null;
      }), void 0);
  
      _.findKey({a: {a: 1}}, function(a, key, obj) {
        assert.equal(key, 'a');
        assert.deepEqual(obj, {a: {a: 1}});
        assert.strictEqual(this, objects, 'called with context');
      }, objects);
  
      var array = [1, 2, 3, 4];
      array.match = 55;
      assert.strictEqual(_.findKey(array, function(x) { return x === 55; }), 'match', 'matches array-likes keys');
    });
  
  
    QUnit.test('mapObject', function(assert) {
      var obj = {a: 1, b: 2};
      var objects = {
        a: {a: 0, b: 0},
        b: {a: 1, b: 1},
        c: {a: 2, b: 2}
      };
  
      assert.deepEqual(_.mapObject(obj, function(val) {
        return val * 2;
      }), {a: 2, b: 4}, 'simple objects');
  
      assert.deepEqual(_.mapObject(objects, function(val) {
        return _.reduce(val, function(memo, v){
          return memo + v;
        }, 0);
      }), {a: 0, b: 2, c: 4}, 'nested objects');
  
      assert.deepEqual(_.mapObject(obj, function(val, key, o) {
        return o[key] * 2;
      }), {a: 2, b: 4}, 'correct keys');
  
      assert.deepEqual(_.mapObject([1, 2], function(val) {
        return val * 2;
      }), {0: 2, 1: 4}, 'check behavior for arrays');
  
      assert.deepEqual(_.mapObject(obj, function(val) {
        return val * this.multiplier;
      }, {multiplier: 3}), {a: 3, b: 6}, 'keep context');
  
      assert.deepEqual(_.mapObject({a: 1}, function() {
        return this.length;
      }, [1, 2]), {a: 2}, 'called with context');
  
      var ids = _.mapObject({length: 2, 0: {id: '1'}, 1: {id: '2'}}, function(n){
        return n.id;
      });
      assert.deepEqual(ids, {length: void 0, 0: '1', 1: '2'}, 'Check with array-like objects');
  
      // Passing a property name like _.pluck.
      var people = {a: {name: 'moe', age: 30}, b: {name: 'curly', age: 50}};
      assert.deepEqual(_.mapObject(people, 'name'), {a: 'moe', b: 'curly'}, 'predicate string map to object properties');
  
      _.each([null, void 0, 1, 'abc', [], {}, void 0], function(val){
        assert.deepEqual(_.mapObject(val, _.identity), {}, 'mapValue identity');
      });
  
      var Proto = function(){ this.a = 1; };
      Proto.prototype.b = 1;
      var protoObj = new Proto();
      assert.deepEqual(_.mapObject(protoObj, _.identity), {a: 1}, 'ignore inherited values from prototypes');
  
    });
  }());
  