/*!

* chai
* Copyright(c) 2011-2014 Jake Luer <jake@alogicalparadox.com>
* MIT Licensed
*/

module.exports = function (chai, util) {

 /*!
  * Chai dependencies.
  */

 var Assertion = chai.Assertion
   , flag = util.flag;

 /*!
  * Module export.
  */

 /**
  * ### assert(expression, message)
  *
  * Write your own test expressions.
  *
  *     assert('foo' !== 'bar', 'foo is not bar');
  *     assert(Array.isArray([]), 'empty arrays are arrays');
  *
  * @param {Mixed} expression to test for truthiness
  * @param {String} message to display on error
  * @name assert
  * @namespace Assert
  * @api public
  */

 var assert = chai.assert = function (express, errmsg) {
   var test = new Assertion(null, null, chai.assert, true);
   test.assert(
       express
     , errmsg
     , '[ negation message unavailable ]'
   );
 };

 /**
  * ### .fail([message])
  * ### .fail(actual, expected, [message], [operator])
  *
  * Throw a failure. Node.js `assert` module-compatible.
  *
  *     assert.fail();
  *     assert.fail("custom error message");
  *     assert.fail(1, 2);
  *     assert.fail(1, 2, "custom error message");
  *     assert.fail(1, 2, "custom error message", ">");
  *     assert.fail(1, 2, undefined, ">");
  *
  * @name fail
  * @param {Mixed} actual
  * @param {Mixed} expected
  * @param {String} message
  * @param {String} operator
  * @namespace Assert
  * @api public
  */

 assert.fail = function (actual, expected, message, operator) {
   if (arguments.length < 2) {
       // Comply with Node's fail([message]) interface

       message = actual;
       actual = undefined;
   }

   message = message || 'assert.fail()';
   throw new chai.AssertionError(message, {
       actual: actual
     , expected: expected
     , operator: operator
   }, assert.fail);
 };

 /**
  * ### .isOk(object, [message])
  *
  * Asserts that `object` is truthy.
  *
  *     assert.isOk('everything', 'everything is ok');
  *     assert.isOk(false, 'this will fail');
  *
  * @name isOk
  * @alias ok
  * @param {Mixed} object to test
  * @param {String} message
  * @namespace Assert
  * @api public
  */

 assert.isOk = function (val, msg) {
   new Assertion(val, msg, assert.isOk, true).is.ok;
 };

 /**
  * ### .isNotOk(object, [message])
  *
  * Asserts that `object` is falsy.
  *
  *     assert.isNotOk('everything', 'this will fail');
  *     assert.isNotOk(false, 'this will pass');
  *
  * @name isNotOk
  * @alias notOk
  * @param {Mixed} object to test
  * @param {String} message
  * @namespace Assert
  * @api public
  */

 assert.isNotOk = function (val, msg) {
   new Assertion(val, msg, assert.isNotOk, true).is.not.ok;
 };

 /**
  * ### .equal(actual, expected, [message])
  *
  * Asserts non-strict equality (`==`) of `actual` and `expected`.
  *
  *     assert.equal(3, '3', '== coerces values to strings');
  *
  * @name equal
  * @param {Mixed} actual
  * @param {Mixed} expected
  * @param {String} message
  * @namespace Assert
  * @api public
  */

 assert.equal = function (act, exp, msg) {
   var test = new Assertion(act, msg, assert.equal, true);

   test.assert(
       exp == flag(test, 'object')
     , 'expected #{this} to equal #{exp}'
     , 'expected #{this} to not equal #{act}'
     , exp
     , act
     , true
   );
 };

 /**
  * ### .notEqual(actual, expected, [message])
  *
  * Asserts non-strict inequality (`!=`) of `actual` and `expected`.
  *
  *     assert.notEqual(3, 4, 'these numbers are not equal');
  *
  * @name notEqual
  * @param {Mixed} actual
  * @param {Mixed} expected
  * @param {String} message
  * @namespace Assert
  * @api public
  */

 assert.notEqual = function (act, exp, msg) {
   var test = new Assertion(act, msg, assert.notEqual, true);

   test.assert(
       exp != flag(test, 'object')
     , 'expected #{this} to not equal #{exp}'
     , 'expected #{this} to equal #{act}'
     , exp
     , act
     , true
   );
 };

 /**
  * ### .strictEqual(actual, expected, [message])
  *
  * Asserts strict equality (`===`) of `actual` and `expected`.
  *
  *     assert.strictEqual(true, true, 'these booleans are strictly equal');
  *
  * @name strictEqual
  * @param {Mixed} actual
  * @param {Mixed} expected
  * @param {String} message
  * @namespace Assert
  * @api public
  */

 assert.strictEqual = function (act, exp, msg) {
   new Assertion(act, msg, assert.strictEqual, true).to.equal(exp);
 };

 /**
  * ### .notStrictEqual(actual, expected, [message])
  *
  * Asserts strict inequality (`!==`) of `actual` and `expected`.
  *
  *     assert.notStrictEqual(3, '3', 'no coercion for strict equality');
  *
  * @name notStrictEqual
  * @param {Mixed} actual
  * @param {Mixed} expected
  * @param {String} message
  * @namespace Assert
  * @api public
  */

 assert.notStrictEqual = function (act, exp, msg) {
   new Assertion(act, msg, assert.notStrictEqual, true).to.not.equal(exp);
 };

 /**
  * ### .deepEqual(actual, expected, [message])
  *
  * Asserts that `actual` is deeply equal to `expected`.
  *
  *     assert.deepEqual({ tea: 'green' }, { tea: 'green' });
  *
  * @name deepEqual
  * @param {Mixed} actual
  * @param {Mixed} expected
  * @param {String} message
  * @alias deepStrictEqual
  * @namespace Assert
  * @api public
  */

 assert.deepEqual = assert.deepStrictEqual = function (act, exp, msg) {
   new Assertion(act, msg, assert.deepEqual, true).to.eql(exp);
 };

 /**
  * ### .notDeepEqual(actual, expected, [message])
  *
  * Assert that `actual` is not deeply equal to `expected`.
  *
  *     assert.notDeepEqual({ tea: 'green' }, { tea: 'jasmine' });
  *
  * @name notDeepEqual
  * @param {Mixed} actual
  * @param {Mixed} expected
  * @param {String} message
  * @namespace Assert
  * @api public
  */

 assert.notDeepEqual = function (act, exp, msg) {
   new Assertion(act, msg, assert.notDeepEqual, true).to.not.eql(exp);
 };

  /**
  * ### .isAbove(valueToCheck, valueToBeAbove, [message])
  *
  * Asserts `valueToCheck` is strictly greater than (>) `valueToBeAbove`.
  *
  *     assert.isAbove(5, 2, '5 is strictly greater than 2');
  *
  * @name isAbove
  * @param {Mixed} valueToCheck
  * @param {Mixed} valueToBeAbove
  * @param {String} message
  * @namespace Assert
  * @api public
  */

 assert.isAbove = function (val, abv, msg) {
   new Assertion(val, msg, assert.isAbove, true).to.be.above(abv);
 };

  /**
  * ### .isAtLeast(valueToCheck, valueToBeAtLeast, [message])
  *
  * Asserts `valueToCheck` is greater than or equal to (>=) `valueToBeAtLeast`.
  *
  *     assert.isAtLeast(5, 2, '5 is greater or equal to 2');
  *     assert.isAtLeast(3, 3, '3 is greater or equal to 3');
  *
  * @name isAtLeast
  * @param {Mixed} valueToCheck
  * @param {Mixed} valueToBeAtLeast
  * @param {String} message
  * @namespace Assert
  * @api public
  */

 assert.isAtLeast = function (val, atlst, msg) {
   new Assertion(val, msg, assert.isAtLeast, true).to.be.least(atlst);
 };

  /**
  * ### .isBelow(valueToCheck, valueToBeBelow, [message])
  *
  * Asserts `valueToCheck` is strictly less than (<) `valueToBeBelow`.
  *
  *     assert.isBelow(3, 6, '3 is strictly less than 6');
  *
  * @name isBelow
  * @param {Mixed} valueToCheck
  * @param {Mixed} valueToBeBelow
  * @param {String} message
  * @namespace Assert
  * @api public
  */

 assert.isBelow = function (val, blw, msg) {
   new Assertion(val, msg, assert.isBelow, true).to.be.below(blw);
 };

  /**
  * ### .isAtMost(valueToCheck, valueToBeAtMost, [message])
  *
  * Asserts `valueToCheck` is less than or equal to (<=) `valueToBeAtMost`.
  *
  *     assert.isAtMost(3, 6, '3 is less than or equal to 6');
  *     assert.isAtMost(4, 4, '4 is less than or equal to 4');
  *
  * @name isAtMost
  * @param {Mixed} valueToCheck
  * @param {Mixed} valueToBeAtMost
  * @param {String} message
  * @namespace Assert
  * @api public
  */

 assert.isAtMost = function (val, atmst, msg) {
   new Assertion(val, msg, assert.isAtMost, true).to.be.most(atmst);
 };

 /**
  * ### .isTrue(value, [message])
  *
  * Asserts that `value` is true.
  *
  *     var teaServed = true;
  *     assert.isTrue(teaServed, 'the tea has been served');
  *
  * @name isTrue
  * @param {Mixed} value
  * @param {String} message
  * @namespace Assert
  * @api public
  */

 assert.isTrue = function (val, msg) {
   new Assertion(val, msg, assert.isTrue, true).is['true'];
 };

 /**
  * ### .isNotTrue(value, [message])
  *
  * Asserts that `value` is not true.
  *
  *     var tea = 'tasty chai';
  *     assert.isNotTrue(tea, 'great, time for tea!');
  *
  * @name isNotTrue
  * @param {Mixed} value
  * @param {String} message
  * @namespace Assert
  * @api public
  */

 assert.isNotTrue = function (val, msg) {
   new Assertion(val, msg, assert.isNotTrue, true).to.not.equal(true);
 };

 /**
  * ### .isFalse(value, [message])
  *
  * Asserts that `value` is false.
  *
  *     var teaServed = false;
  *     assert.isFalse(teaServed, 'no tea yet? hmm...');
  *
  * @name isFalse
  * @param {Mixed} value
  * @param {String} message
  * @namespace Assert
  * @api public
  */

 assert.isFalse = function (val, msg) {
   new Assertion(val, msg, assert.isFalse, true).is['false'];
 };

 /**
  * ### .isNotFalse(value, [message])
  *
  * Asserts that `value` is not false.
  *
  *     var tea = 'tasty chai';
  *     assert.isNotFalse(tea, 'great, time for tea!');
  *
  * @name isNotFalse
  * @param {Mixed} value
  * @param {String} message
  * @namespace Assert
  * @api public
  */

 assert.isNotFalse = function (val, msg) {
   new Assertion(val, msg, assert.isNotFalse, true).to.not.equal(false);
 };

 /**
  * ### .isNull(value, [message])
  *
  * Asserts that `value` is null.
  *
  *     assert.isNull(err, 'there was no error');
  *
  * @name isNull
  * @param {Mixed} value
  * @param {String} message
  * @namespace Assert
  * @api public
  */

 assert.isNull = function (val, msg) {
   new Assertion(val, msg, assert.isNull, true).to.equal(null);
 };

 /**
  * ### .isNotNull(value, [message])
  *
  * Asserts that `value` is not null.
  *
  *     var tea = 'tasty chai';
  *     assert.isNotNull(tea, 'great, time for tea!');
  *
  * @name isNotNull
  * @param {Mixed} value
  * @param {String} message
  * @namespace Assert
  * @api public
  */

 assert.isNotNull = function (val, msg) {
   new Assertion(val, msg, assert.isNotNull, true).to.not.equal(null);
 };

 /**
  * ### .isNaN
  *
  * Asserts that value is NaN.
  *
  *     assert.isNaN(NaN, 'NaN is NaN');
  *
  * @name isNaN
  * @param {Mixed} value
  * @param {String} message
  * @namespace Assert
  * @api public
  */

 assert.isNaN = function (val, msg) {
   new Assertion(val, msg, assert.isNaN, true).to.be.NaN;
 };

 /**
  * ### .isNotNaN
  *
  * Asserts that value is not NaN.
  *
  *     assert.isNotNaN(4, '4 is not NaN');
  *
  * @name isNotNaN
  * @param {Mixed} value
  * @param {String} message
  * @namespace Assert
  * @api public
  */
 assert.isNotNaN = function (val, msg) {
   new Assertion(val, msg, assert.isNotNaN, true).not.to.be.NaN;
 };

 /**
  * ### .exists
  *
  * Asserts that the target is neither `null` nor `undefined`.
  *
  *     var foo = 'hi';
  *
  *     assert.exists(foo, 'foo is neither `null` nor `undefined`');
  *
  * @name exists
  * @param {Mixed} value
  * @param {String} message
  * @namespace Assert
  * @api public
  */

 assert.exists = function (val, msg) {
   new Assertion(val, msg, assert.exists, true).to.exist;
 };

 /**
  * ### .notExists
  *
  * Asserts that the target is either `null` or `undefined`.
  *
  *     var bar = null
  *       , baz;
  *
  *     assert.notExists(bar);
  *     assert.notExists(baz, 'baz is either null or undefined');
  *
  * @name notExists
  * @param {Mixed} value
  * @param {String} message
  * @namespace Assert
  * @api public
  */

 assert.notExists = function (val, msg) {
   new Assertion(val, msg, assert.notExists, true).to.not.exist;
 };

 /**
  * ### .isUndefined(value, [message])
  *
  * Asserts that `value` is `undefined`.
  *
  *     var tea;
  *     assert.isUndefined(tea, 'no tea defined');
  *
  * @name isUndefined
  * @param {Mixed} value
  * @param {String} message
  * @namespace Assert
  * @api public
  */

 assert.isUndefined = function (val, msg) {
   new Assertion(val, msg, assert.isUndefined, true).to.equal(undefined);
 };

 /**
  * ### .isDefined(value, [message])
  *
  * Asserts that `value` is not `undefined`.
  *
  *     var tea = 'cup of chai';
  *     assert.isDefined(tea, 'tea has been defined');
  *
  * @name isDefined
  * @param {Mixed} value
  * @param {String} message
  * @namespace Assert
  * @api public
  */

 assert.isDefined = function (val, msg) {
   new Assertion(val, msg, assert.isDefined, true).to.not.equal(undefined);
 };

 /**
  * ### .isFunction(value, [message])
  *
  * Asserts that `value` is a function.
  *
  *     function serveTea() { return 'cup of tea'; };
  *     assert.isFunction(serveTea, 'great, we can have tea now');
  *
  * @name isFunction
  * @param {Mixed} value
  * @param {String} message
  * @namespace Assert
  * @api public
  */

 assert.isFunction = function (val, msg) {
   new Assertion(val, msg, assert.isFunction, true).to.be.a('function');
 };

 /**
  * ### .isNotFunction(value, [message])
  *
  * Asserts that `value` is _not_ a function.
  *
  *     var serveTea = [ 'heat', 'pour', 'sip' ];
  *     assert.isNotFunction(serveTea, 'great, we have listed the steps');
  *
  * @name isNotFunction
  * @param {Mixed} value
  * @param {String} message
  * @namespace Assert
  * @api public
  */

 assert.isNotFunction = function (val, msg) {
   new Assertion(val, msg, assert.isNotFunction, true).to.not.be.a('function');
 };

 /**
  * ### .isObject(value, [message])
  *
  * Asserts that `value` is an object of type 'Object' (as revealed by `Object.prototype.toString`).
  * _The assertion does not match subclassed objects._
  *
  *     var selection = { name: 'Chai', serve: 'with spices' };
  *     assert.isObject(selection, 'tea selection is an object');
  *
  * @name isObject
  * @param {Mixed} value
  * @param {String} message
  * @namespace Assert
  * @api public
  */

 assert.isObject = function (val, msg) {
   new Assertion(val, msg, assert.isObject, true).to.be.a('object');
 };

 /**
  * ### .isNotObject(value, [message])
  *
  * Asserts that `value` is _not_ an object of type 'Object' (as revealed by `Object.prototype.toString`).
  *
  *     var selection = 'chai'
  *     assert.isNotObject(selection, 'tea selection is not an object');
  *     assert.isNotObject(null, 'null is not an object');
  *
  * @name isNotObject
  * @param {Mixed} value
  * @param {String} message
  * @namespace Assert
  * @api public
  */

 assert.isNotObject = function (val, msg) {
   new Assertion(val, msg, assert.isNotObject, true).to.not.be.a('object');
 };

 /**
  * ### .isArray(value, [message])
  *
  * Asserts that `value` is an array.
  *
  *     var menu = [ 'green', 'chai', 'oolong' ];
  *     assert.isArray(menu, 'what kind of tea do we want?');
  *
  * @name isArray
  * @param {Mixed} value
  * @param {String} message
  * @namespace Assert
  * @api public
  */

 assert.isArray = function (val, msg) {
   new Assertion(val, msg, assert.isArray, true).to.be.an('array');
 };

 /**
  * ### .isNotArray(value, [message])
  *
  * Asserts that `value` is _not_ an array.
  *
  *     var menu = 'green|chai|oolong';
  *     assert.isNotArray(menu, 'what kind of tea do we want?');
  *
  * @name isNotArray
  * @param {Mixed} value
  * @param {String} message
  * @namespace Assert
  * @api public
  */

 assert.isNotArray = function (val, msg) {
   new Assertion(val, msg, assert.isNotArray, true).to.not.be.an('array');
 };

 /**
  * ### .isString(value, [message])
  *
  * Asserts that `value` is a string.
  *
  *     var teaOrder = 'chai';
  *     assert.isString(teaOrder, 'order placed');
  *
  * @name isString
  * @param {Mixed} value
  * @param {String} message
  * @namespace Assert
  * @api public
  */

 assert.isString = function (val, msg) {
   new Assertion(val, msg, assert.isString, true).to.be.a('string');
 };

 /**
  * ### .isNotString(value, [message])
  *
  * Asserts that `value` is _not_ a string.
  *
  *     var teaOrder = 4;
  *     assert.isNotString(teaOrder, 'order placed');
  *
  * @name isNotString
  * @param {Mixed} value
  * @param {String} message
  * @namespace Assert
  * @api public
  */

 assert.isNotString = function (val, msg) {
   new Assertion(val, msg, assert.isNotString, true).to.not.be.a('string');
 };

 /**
  * ### .isNumber(value, [message])
  *
  * Asserts that `value` is a number.
  *
  *     var cups = 2;
  *     assert.isNumber(cups, 'how many cups');
  *
  * @name isNumber
  * @param {Number} value
  * @param {String} message
  * @namespace Assert
  * @api public
  */

 assert.isNumber = function (val, msg) {
   new Assertion(val, msg, assert.isNumber, true).to.be.a('number');
 };

 /**
  * ### .isNotNumber(value, [message])
  *
  * Asserts that `value` is _not_ a number.
  *
  *     var cups = '2 cups please';
  *     assert.isNotNumber(cups, 'how many cups');
  *
  * @name isNotNumber
  * @param {Mixed} value
  * @param {String} message
  * @namespace Assert
  * @api public
  */

 assert.isNotNumber = function (val, msg) {
   new Assertion(val, msg, assert.isNotNumber, true).to.not.be.a('number');
 };

  /**
  * ### .isFinite(value, [message])
  *
  * Asserts that `value` is a finite number. Unlike `.isNumber`, this will fail for `NaN` and `Infinity`.
  *
  *     var cups = 2;
  *     assert.isFinite(cups, 'how many cups');
  *
  *     assert.isFinite(NaN); // throws
  *
  * @name isFinite
  * @param {Number} value
  * @param {String} message
  * @namespace Assert
  * @api public
  */

 assert.isFinite = function (val, msg) {
   new Assertion(val, msg, assert.isFinite, true).to.be.finite;
 };

 /**
  * ### .isBoolean(value, [message])
  *
  * Asserts that `value` is a boolean.
  *
  *     var teaReady = true
  *       , teaServed = false;
  *
  *     assert.isBoolean(teaReady, 'is the tea ready');
  *     assert.isBoolean(teaServed, 'has tea been served');
  *
  * @name isBoolean
  * @param {Mixed} value
  * @param {String} message
  * @namespace Assert
  * @api public
  */

 assert.isBoolean = function (val, msg) {
   new Assertion(val, msg, assert.isBoolean, true).to.be.a('boolean');
 };

 /**
  * ### .isNotBoolean(value, [message])
  *
  * Asserts that `value` is _not_ a boolean.
  *
  *     var teaReady = 'yep'
  *       , teaServed = 'nope';
  *
  *     assert.isNotBoolean(teaReady, 'is the tea ready');
  *     assert.isNotBoolean(teaServed, 'has tea been served');
  *
  * @name isNotBoolean
  * @param {Mixed} value
  * @param {String} message
  * @namespace Assert
  * @api public
  */

 assert.isNotBoolean = function (val, msg) {
   new Assertion(val, msg, assert.isNotBoolean, true).to.not.be.a('boolean');
 };

 /**
  * ### .typeOf(value, name, [message])
  *
  * Asserts that `value`'s type is `name`, as determined by
  * `Object.prototype.toString`.
  *
  *     assert.typeOf({ tea: 'chai' }, 'object', 'we have an object');
  *     assert.typeOf(['chai', 'jasmine'], 'array', 'we have an array');
  *     assert.typeOf('tea', 'string', 'we have a string');
  *     assert.typeOf(/tea/, 'regexp', 'we have a regular expression');
  *     assert.typeOf(null, 'null', 'we have a null');
  *     assert.typeOf(undefined, 'undefined', 'we have an undefined');
  *
  * @name typeOf
  * @param {Mixed} value
  * @param {String} name
  * @param {String} message
  * @namespace Assert
  * @api public
  */

 assert.typeOf = function (val, type, msg) {
   new Assertion(val, msg, assert.typeOf, true).to.be.a(type);
 };

 /**
  * ### .notTypeOf(value, name, [message])
  *
  * Asserts that `value`'s type is _not_ `name`, as determined by
  * `Object.prototype.toString`.
  *
  *     assert.notTypeOf('tea', 'number', 'strings are not numbers');
  *
  * @name notTypeOf
  * @param {Mixed} value
  * @param {String} typeof name
  * @param {String} message
  * @namespace Assert
  * @api public
  */

 assert.notTypeOf = function (val, type, msg) {
   new Assertion(val, msg, assert.notTypeOf, true).to.not.be.a(type);
 };

 /**
  * ### .instanceOf(object, constructor, [message])
  *
  * Asserts that `value` is an instance of `constructor`.
  *
  *     var Tea = function (name) { this.name = name; }
  *       , chai = new Tea('chai');
  *
  *     assert.instanceOf(chai, Tea, 'chai is an instance of tea');
  *
  * @name instanceOf
  * @param {Object} object
  * @param {Constructor} constructor
  * @param {String} message
  * @namespace Assert
  * @api public
  */

 assert.instanceOf = function (val, type, msg) {
   new Assertion(val, msg, assert.instanceOf, true).to.be.instanceOf(type);
 };

 /**
  * ### .notInstanceOf(object, constructor, [message])
  *
  * Asserts `value` is not an instance of `constructor`.
  *
  *     var Tea = function (name) { this.name = name; }
  *       , chai = new String('chai');
  *
  *     assert.notInstanceOf(chai, Tea, 'chai is not an instance of tea');
  *
  * @name notInstanceOf
  * @param {Object} object
  * @param {Constructor} constructor
  * @param {String} message
  * @namespace Assert
  * @api public
  */

 assert.notInstanceOf = function (val, type, msg) {
   new Assertion(val, msg, assert.notInstanceOf, true)
     .to.not.be.instanceOf(type);
 };

 /**
  * ### .include(haystack, needle, [message])
  *
  * Asserts that `haystack` includes `needle`. Can be used to assert the
  * inclusion of a value in an array, a substring in a string, or a subset of
  * properties in an object.
  *
  *     assert.include([1,2,3], 2, 'array contains value');
  *     assert.include('foobar', 'foo', 'string contains substring');
  *     assert.include({ foo: 'bar', hello: 'universe' }, { foo: 'bar' }, 'object contains property');
  *
  * Strict equality (===) is used. When asserting the inclusion of a value in
  * an array, the array is searched for an element that's strictly equal to the
  * given value. When asserting a subset of properties in an object, the object
  * is searched for the given property keys, checking that each one is present
  * and strictly equal to the given property value. For instance:
  *
  *     var obj1 = {a: 1}
  *       , obj2 = {b: 2};
  *     assert.include([obj1, obj2], obj1);
  *     assert.include({foo: obj1, bar: obj2}, {foo: obj1});
  *     assert.include({foo: obj1, bar: obj2}, {foo: obj1, bar: obj2});
  *
  * @name include
  * @param {Array|String} haystack
  * @param {Mixed} needle
  * @param {String} message
  * @namespace Assert
  * @api public
  */

 assert.include = function (exp, inc, msg) {
   new Assertion(exp, msg, assert.include, true).include(inc);
 };

 /**
  * ### .notInclude(haystack, needle, [message])
  *
  * Asserts that `haystack` does not include `needle`. Can be used to assert
  * the absence of a value in an array, a substring in a string, or a subset of
  * properties in an object.
  *
  *     assert.notInclude([1,2,3], 4, "array doesn't contain value");
  *     assert.notInclude('foobar', 'baz', "string doesn't contain substring");
  *     assert.notInclude({ foo: 'bar', hello: 'universe' }, { foo: 'baz' }, 'object doesn't contain property');
  *
  * Strict equality (===) is used. When asserting the absence of a value in an
  * array, the array is searched to confirm the absence of an element that's
  * strictly equal to the given value. When asserting a subset of properties in
  * an object, the object is searched to confirm that at least one of the given
  * property keys is either not present or not strictly equal to the given
  * property value. For instance:
  *
  *     var obj1 = {a: 1}
  *       , obj2 = {b: 2};
  *     assert.notInclude([obj1, obj2], {a: 1});
  *     assert.notInclude({foo: obj1, bar: obj2}, {foo: {a: 1}});
  *     assert.notInclude({foo: obj1, bar: obj2}, {foo: obj1, bar: {b: 2}});
  *
  * @name notInclude
  * @param {Array|String} haystack
  * @param {Mixed} needle
  * @param {String} message
  * @namespace Assert
  * @api public
  */

 assert.notInclude = function (exp, inc, msg) {
   new Assertion(exp, msg, assert.notInclude, true).not.include(inc);
 };

 /**
  * ### .deepInclude(haystack, needle, [message])
  *
  * Asserts that `haystack` includes `needle`. Can be used to assert the
  * inclusion of a value in an array or a subset of properties in an object.
  * Deep equality is used.
  *
  *     var obj1 = {a: 1}
  *       , obj2 = {b: 2};
  *     assert.deepInclude([obj1, obj2], {a: 1});
  *     assert.deepInclude({foo: obj1, bar: obj2}, {foo: {a: 1}});
  *     assert.deepInclude({foo: obj1, bar: obj2}, {foo: {a: 1}, bar: {b: 2}});
  *
  * @name deepInclude
  * @param {Array|String} haystack
  * @param {Mixed} needle
  * @param {String} message
  * @namespace Assert
  * @api public
  */

 assert.deepInclude = function (exp, inc, msg) {
   new Assertion(exp, msg, assert.deepInclude, true).deep.include(inc);
 };

 /**
  * ### .notDeepInclude(haystack, needle, [message])
  *
  * Asserts that `haystack` does not include `needle`. Can be used to assert
  * the absence of a value in an array or a subset of properties in an object.
  * Deep equality is used.
  *
  *     var obj1 = {a: 1}
  *       , obj2 = {b: 2};
  *     assert.notDeepInclude([obj1, obj2], {a: 9});
  *     assert.notDeepInclude({foo: obj1, bar: obj2}, {foo: {a: 9}});
  *     assert.notDeepInclude({foo: obj1, bar: obj2}, {foo: {a: 1}, bar: {b: 9}});
  *
  * @name notDeepInclude
  * @param {Array|String} haystack
  * @param {Mixed} needle
  * @param {String} message
  * @namespace Assert
  * @api public
  */

 assert.notDeepInclude = function (exp, inc, msg) {
   new Assertion(exp, msg, assert.notDeepInclude, true).not.deep.include(inc);
 };

 /**
  * ### .nestedInclude(haystack, needle, [message])
  *
  * Asserts that 'haystack' includes 'needle'.
  * Can be used to assert the inclusion of a subset of properties in an
  * object.
  * Enables the use of dot- and bracket-notation for referencing nested
  * properties.
  * '[]' and '.' in property names can be escaped using double backslashes.
  *
  *     assert.nestedInclude({'.a': {'b': 'x'}}, {'\\.a.[b]': 'x'});
  *     assert.nestedInclude({'a': {'[b]': 'x'}}, {'a.\\[b\\]': 'x'});
  *
  * @name nestedInclude
  * @param {Object} haystack
  * @param {Object} needle
  * @param {String} message
  * @namespace Assert
  * @api public
  */

 assert.nestedInclude = function (exp, inc, msg) {
   new Assertion(exp, msg, assert.nestedInclude, true).nested.include(inc);
 };

 /**
  * ### .notNestedInclude(haystack, needle, [message])
  *
  * Asserts that 'haystack' does not include 'needle'.
  * Can be used to assert the absence of a subset of properties in an
  * object.
  * Enables the use of dot- and bracket-notation for referencing nested
  * properties.
  * '[]' and '.' in property names can be escaped using double backslashes.
  *
  *     assert.notNestedInclude({'.a': {'b': 'x'}}, {'\\.a.b': 'y'});
  *     assert.notNestedInclude({'a': {'[b]': 'x'}}, {'a.\\[b\\]': 'y'});
  *
  * @name notNestedInclude
  * @param {Object} haystack
  * @param {Object} needle
  * @param {String} message
  * @namespace Assert
  * @api public
  */

 assert.notNestedInclude = function (exp, inc, msg) {
   new Assertion(exp, msg, assert.notNestedInclude, true)
     .not.nested.include(inc);
 };

 /**
  * ### .deepNestedInclude(haystack, needle, [message])
  *
  * Asserts that 'haystack' includes 'needle'.
  * Can be used to assert the inclusion of a subset of properties in an
  * object while checking for deep equality.
  * Enables the use of dot- and bracket-notation for referencing nested
  * properties.
  * '[]' and '.' in property names can be escaped using double backslashes.
  *
  *     assert.deepNestedInclude({a: {b: [{x: 1}]}}, {'a.b[0]': {x: 1}});
  *     assert.deepNestedInclude({'.a': {'[b]': {x: 1}}}, {'\\.a.\\[b\\]': {x: 1}});
  *
  * @name deepNestedInclude
  * @param {Object} haystack
  * @param {Object} needle
  * @param {String} message
  * @namespace Assert
  * @api public
  */

 assert.deepNestedInclude = function(exp, inc, msg) {
   new Assertion(exp, msg, assert.deepNestedInclude, true)
     .deep.nested.include(inc);
 };

 /**
  * ### .notDeepNestedInclude(haystack, needle, [message])
  *
  * Asserts that 'haystack' does not include 'needle'.
  * Can be used to assert the absence of a subset of properties in an
  * object while checking for deep equality.
  * Enables the use of dot- and bracket-notation for referencing nested
  * properties.
  * '[]' and '.' in property names can be escaped using double backslashes.
  *
  *     assert.notDeepNestedInclude({a: {b: [{x: 1}]}}, {'a.b[0]': {y: 1}})
  *     assert.notDeepNestedInclude({'.a': {'[b]': {x: 1}}}, {'\\.a.\\[b\\]': {y: 2}});
  *
  * @name notDeepNestedInclude
  * @param {Object} haystack
  * @param {Object} needle
  * @param {String} message
  * @namespace Assert
  * @api public
  */

 assert.notDeepNestedInclude = function(exp, inc, msg) {
   new Assertion(exp, msg, assert.notDeepNestedInclude, true)
     .not.deep.nested.include(inc);
 };

 /**
  * ### .ownInclude(haystack, needle, [message])
  *
  * Asserts that 'haystack' includes 'needle'.
  * Can be used to assert the inclusion of a subset of properties in an
  * object while ignoring inherited properties.
  *
  *     assert.ownInclude({ a: 1 }, { a: 1 });
  *
  * @name ownInclude
  * @param {Object} haystack
  * @param {Object} needle
  * @param {String} message
  * @namespace Assert
  * @api public
  */

 assert.ownInclude = function(exp, inc, msg) {
   new Assertion(exp, msg, assert.ownInclude, true).own.include(inc);
 };

 /**
  * ### .notOwnInclude(haystack, needle, [message])
  *
  * Asserts that 'haystack' includes 'needle'.
  * Can be used to assert the absence of a subset of properties in an
  * object while ignoring inherited properties.
  *
  *     Object.prototype.b = 2;
  *
  *     assert.notOwnInclude({ a: 1 }, { b: 2 });
  *
  * @name notOwnInclude
  * @param {Object} haystack
  * @param {Object} needle
  * @param {String} message
  * @namespace Assert
  * @api public
  */

 assert.notOwnInclude = function(exp, inc, msg) {
   new Assertion(exp, msg, assert.notOwnInclude, true).not.own.include(inc);
 };

 /**
  * ### .deepOwnInclude(haystack, needle, [message])
  *
  * Asserts that 'haystack' includes 'needle'.
  * Can be used to assert the inclusion of a subset of properties in an
  * object while ignoring inherited properties and checking for deep equality.
  *
  *      assert.deepOwnInclude({a: {b: 2}}, {a: {b: 2}});
  *
  * @name deepOwnInclude
  * @param {Object} haystack
  * @param {Object} needle
  * @param {String} message
  * @namespace Assert
  * @api public
  */

 assert.deepOwnInclude = function(exp, inc, msg) {
   new Assertion(exp, msg, assert.deepOwnInclude, true)
     .deep.own.include(inc);
 };

  /**
  * ### .notDeepOwnInclude(haystack, needle, [message])
  *
  * Asserts that 'haystack' includes 'needle'.
  * Can be used to assert the absence of a subset of properties in an
  * object while ignoring inherited properties and checking for deep equality.
  *
  *      assert.notDeepOwnInclude({a: {b: 2}}, {a: {c: 3}});
  *
  * @name notDeepOwnInclude
  * @param {Object} haystack
  * @param {Object} needle
  * @param {String} message
  * @namespace Assert
  * @api public
  */

 assert.notDeepOwnInclude = function(exp, inc, msg) {
   new Assertion(exp, msg, assert.notDeepOwnInclude, true)
     .not.deep.own.include(inc);
 };

 /**
  * ### .match(value, regexp, [message])
  *
  * Asserts that `value` matches the regular expression `regexp`.
  *
  *     assert.match('foobar', /^foo/, 'regexp matches');
  *
  * @name match
  * @param {Mixed} value
  * @param {RegExp} regexp
  * @param {String} message
  * @namespace Assert
  * @api public
  */

 assert.match = function (exp, re, msg) {
   new Assertion(exp, msg, assert.match, true).to.match(re);
 };

 /**
  * ### .notMatch(value, regexp, [message])
  *
  * Asserts that `value` does not match the regular expression `regexp`.
  *
  *     assert.notMatch('foobar', /^foo/, 'regexp does not match');
  *
  * @name notMatch
  * @param {Mixed} value
  * @param {RegExp} regexp
  * @param {String} message
  * @namespace Assert
  * @api public
  */

 assert.notMatch = function (exp, re, msg) {
   new Assertion(exp, msg, assert.notMatch, true).to.not.match(re);
 };

 /**
  * ### .property(object, property, [message])
  *
  * Asserts that `object` has a direct or inherited property named by
  * `property`.
  *
  *     assert.property({ tea: { green: 'matcha' }}, 'tea');
  *     assert.property({ tea: { green: 'matcha' }}, 'toString');
  *
  * @name property
  * @param {Object} object
  * @param {String} property
  * @param {String} message
  * @namespace Assert
  * @api public
  */

 assert.property = function (obj, prop, msg) {
   new Assertion(obj, msg, assert.property, true).to.have.property(prop);
 };

 /**
  * ### .notProperty(object, property, [message])
  *
  * Asserts that `object` does _not_ have a direct or inherited property named
  * by `property`.
  *
  *     assert.notProperty({ tea: { green: 'matcha' }}, 'coffee');
  *
  * @name notProperty
  * @param {Object} object
  * @param {String} property
  * @param {String} message
  * @namespace Assert
  * @api public
  */

 assert.notProperty = function (obj, prop, msg) {
   new Assertion(obj, msg, assert.notProperty, true)
     .to.not.have.property(prop);
 };

 /**
  * ### .propertyVal(object, property, value, [message])
  *
  * Asserts that `object` has a direct or inherited property named by
  * `property` with a value given by `value`. Uses a strict equality check
  * (===).
  *
  *     assert.propertyVal({ tea: 'is good' }, 'tea', 'is good');
  *
  * @name propertyVal
  * @param {Object} object
  * @param {String} property
  * @param {Mixed} value
  * @param {String} message
  * @namespace Assert
  * @api public
  */

 assert.propertyVal = function (obj, prop, val, msg) {
   new Assertion(obj, msg, assert.propertyVal, true)
     .to.have.property(prop, val);
 };

 /**
  * ### .notPropertyVal(object, property, value, [message])
  *
  * Asserts that `object` does _not_ have a direct or inherited property named
  * by `property` with value given by `value`. Uses a strict equality check
  * (===).
  *
  *     assert.notPropertyVal({ tea: 'is good' }, 'tea', 'is bad');
  *     assert.notPropertyVal({ tea: 'is good' }, 'coffee', 'is good');
  *
  * @name notPropertyVal
  * @param {Object} object
  * @param {String} property
  * @param {Mixed} value
  * @param {String} message
  * @namespace Assert
  * @api public
  */

 assert.notPropertyVal = function (obj, prop, val, msg) {
   new Assertion(obj, msg, assert.notPropertyVal, true)
     .to.not.have.property(prop, val);
 };

 /**
  * ### .deepPropertyVal(object, property, value, [message])
  *
  * Asserts that `object` has a direct or inherited property named by
  * `property` with a value given by `value`. Uses a deep equality check.
  *
  *     assert.deepPropertyVal({ tea: { green: 'matcha' } }, 'tea', { green: 'matcha' });
  *
  * @name deepPropertyVal
  * @param {Object} object
  * @param {String} property
  * @param {Mixed} value
  * @param {String} message
  * @namespace Assert
  * @api public
  */

 assert.deepPropertyVal = function (obj, prop, val, msg) {
   new Assertion(obj, msg, assert.deepPropertyVal, true)
     .to.have.deep.property(prop, val);
 };

 /**
  * ### .notDeepPropertyVal(object, property, value, [message])
  *
  * Asserts that `object` does _not_ have a direct or inherited property named
  * by `property` with value given by `value`. Uses a deep equality check.
  *
  *     assert.notDeepPropertyVal({ tea: { green: 'matcha' } }, 'tea', { black: 'matcha' });
  *     assert.notDeepPropertyVal({ tea: { green: 'matcha' } }, 'tea', { green: 'oolong' });
  *     assert.notDeepPropertyVal({ tea: { green: 'matcha' } }, 'coffee', { green: 'matcha' });
  *
  * @name notDeepPropertyVal
  * @param {Object} object
  * @param {String} property
  * @param {Mixed} value
  * @param {String} message
  * @namespace Assert
  * @api public
  */

 assert.notDeepPropertyVal = function (obj, prop, val, msg) {
   new Assertion(obj, msg, assert.notDeepPropertyVal, true)
     .to.not.have.deep.property(prop, val);
 };

 /**
  * ### .ownProperty(object, property, [message])
  *
  * Asserts that `object` has a direct property named by `property`. Inherited
  * properties aren't checked.
  *
  *     assert.ownProperty({ tea: { green: 'matcha' }}, 'tea');
  *
  * @name ownProperty
  * @param {Object} object
  * @param {String} property
  * @param {String} message
  * @api public
  */

 assert.ownProperty = function (obj, prop, msg) {
   new Assertion(obj, msg, assert.ownProperty, true)
     .to.have.own.property(prop);
 };

 /**
  * ### .notOwnProperty(object, property, [message])
  *
  * Asserts that `object` does _not_ have a direct property named by
  * `property`. Inherited properties aren't checked.
  *
  *     assert.notOwnProperty({ tea: { green: 'matcha' }}, 'coffee');
  *     assert.notOwnProperty({}, 'toString');
  *
  * @name notOwnProperty
  * @param {Object} object
  * @param {String} property
  * @param {String} message
  * @api public
  */

 assert.notOwnProperty = function (obj, prop, msg) {
   new Assertion(obj, msg, assert.notOwnProperty, true)
     .to.not.have.own.property(prop);
 };

 /**
  * ### .ownPropertyVal(object, property, value, [message])
  *
  * Asserts that `object` has a direct property named by `property` and a value
  * equal to the provided `value`. Uses a strict equality check (===).
  * Inherited properties aren't checked.
  *
  *     assert.ownPropertyVal({ coffee: 'is good'}, 'coffee', 'is good');
  *
  * @name ownPropertyVal
  * @param {Object} object
  * @param {String} property
  * @param {Mixed} value
  * @param {String} message
  * @api public
  */

 assert.ownPropertyVal = function (obj, prop, value, msg) {
   new Assertion(obj, msg, assert.ownPropertyVal, true)
     .to.have.own.property(prop, value);
 };

 /**
  * ### .notOwnPropertyVal(object, property, value, [message])
  *
  * Asserts that `object` does _not_ have a direct property named by `property`
  * with a value equal to the provided `value`. Uses a strict equality check
  * (===). Inherited properties aren't checked.
  *
  *     assert.notOwnPropertyVal({ tea: 'is better'}, 'tea', 'is worse');
  *     assert.notOwnPropertyVal({}, 'toString', Object.prototype.toString);
  *
  * @name notOwnPropertyVal
  * @param {Object} object
  * @param {String} property
  * @param {Mixed} value
  * @param {String} message
  * @api public
  */

 assert.notOwnPropertyVal = function (obj, prop, value, msg) {
   new Assertion(obj, msg, assert.notOwnPropertyVal, true)
     .to.not.have.own.property(prop, value);
 };

 /**
  * ### .deepOwnPropertyVal(object, property, value, [message])
  *
  * Asserts that `object` has a direct property named by `property` and a value
  * equal to the provided `value`. Uses a deep equality check. Inherited
  * properties aren't checked.
  *
  *     assert.deepOwnPropertyVal({ tea: { green: 'matcha' } }, 'tea', { green: 'matcha' });
  *
  * @name deepOwnPropertyVal
  * @param {Object} object
  * @param {String} property
  * @param {Mixed} value
  * @param {String} message
  * @api public
  */

 assert.deepOwnPropertyVal = function (obj, prop, value, msg) {
   new Assertion(obj, msg, assert.deepOwnPropertyVal, true)
     .to.have.deep.own.property(prop, value);
 };

 /**
  * ### .notDeepOwnPropertyVal(object, property, value, [message])
  *
  * Asserts that `object` does _not_ have a direct property named by `property`
  * with a value equal to the provided `value`. Uses a deep equality check.
  * Inherited properties aren't checked.
  *
  *     assert.notDeepOwnPropertyVal({ tea: { green: 'matcha' } }, 'tea', { black: 'matcha' });
  *     assert.notDeepOwnPropertyVal({ tea: { green: 'matcha' } }, 'tea', { green: 'oolong' });
  *     assert.notDeepOwnPropertyVal({ tea: { green: 'matcha' } }, 'coffee', { green: 'matcha' });
  *     assert.notDeepOwnPropertyVal({}, 'toString', Object.prototype.toString);
  *
  * @name notDeepOwnPropertyVal
  * @param {Object} object
  * @param {String} property
  * @param {Mixed} value
  * @param {String} message
  * @api public
  */

 assert.notDeepOwnPropertyVal = function (obj, prop, value, msg) {
   new Assertion(obj, msg, assert.notDeepOwnPropertyVal, true)
     .to.not.have.deep.own.property(prop, value);
 };

 /**
  * ### .nestedProperty(object, property, [message])
  *
  * Asserts that `object` has a direct or inherited property named by
  * `property`, which can be a string using dot- and bracket-notation for
  * nested reference.
  *
  *     assert.nestedProperty({ tea: { green: 'matcha' }}, 'tea.green');
  *
  * @name nestedProperty
  * @param {Object} object
  * @param {String} property
  * @param {String} message
  * @namespace Assert
  * @api public
  */

 assert.nestedProperty = function (obj, prop, msg) {
   new Assertion(obj, msg, assert.nestedProperty, true)
     .to.have.nested.property(prop);
 };

 /**
  * ### .notNestedProperty(object, property, [message])
  *
  * Asserts that `object` does _not_ have a property named by `property`, which
  * can be a string using dot- and bracket-notation for nested reference. The
  * property cannot exist on the object nor anywhere in its prototype chain.
  *
  *     assert.notNestedProperty({ tea: { green: 'matcha' }}, 'tea.oolong');
  *
  * @name notNestedProperty
  * @param {Object} object
  * @param {String} property
  * @param {String} message
  * @namespace Assert
  * @api public
  */

 assert.notNestedProperty = function (obj, prop, msg) {
   new Assertion(obj, msg, assert.notNestedProperty, true)
     .to.not.have.nested.property(prop);
 };

 /**
  * ### .nestedPropertyVal(object, property, value, [message])
  *
  * Asserts that `object` has a property named by `property` with value given
  * by `value`. `property` can use dot- and bracket-notation for nested
  * reference. Uses a strict equality check (===).
  *
  *     assert.nestedPropertyVal({ tea: { green: 'matcha' }}, 'tea.green', 'matcha');
  *
  * @name nestedPropertyVal
  * @param {Object} object
  * @param {String} property
  * @param {Mixed} value
  * @param {String} message
  * @namespace Assert
  * @api public
  */

 assert.nestedPropertyVal = function (obj, prop, val, msg) {
   new Assertion(obj, msg, assert.nestedPropertyVal, true)
     .to.have.nested.property(prop, val);
 };

 /**
  * ### .notNestedPropertyVal(object, property, value, [message])
  *
  * Asserts that `object` does _not_ have a property named by `property` with
  * value given by `value`. `property` can use dot- and bracket-notation for
  * nested reference. Uses a strict equality check (===).
  *
  *     assert.notNestedPropertyVal({ tea: { green: 'matcha' }}, 'tea.green', 'konacha');
  *     assert.notNestedPropertyVal({ tea: { green: 'matcha' }}, 'coffee.green', 'matcha');
  *
  * @name notNestedPropertyVal
  * @param {Object} object
  * @param {String} property
  * @param {Mixed} value
  * @param {String} message
  * @namespace Assert
  * @api public
  */

 assert.notNestedPropertyVal = function (obj, prop, val, msg) {
   new Assertion(obj, msg, assert.notNestedPropertyVal, true)
     .to.not.have.nested.property(prop, val);
 };

 /**
  * ### .deepNestedPropertyVal(object, property, value, [message])
  *
  * Asserts that `object` has a property named by `property` with a value given
  * by `value`. `property` can use dot- and bracket-notation for nested
  * reference. Uses a deep equality check.
  *
  *     assert.deepNestedPropertyVal({ tea: { green: { matcha: 'yum' } } }, 'tea.green', { matcha: 'yum' });
  *
  * @name deepNestedPropertyVal
  * @param {Object} object
  * @param {String} property
  * @param {Mixed} value
  * @param {String} message
  * @namespace Assert
  * @api public
  */

 assert.deepNestedPropertyVal = function (obj, prop, val, msg) {
   new Assertion(obj, msg, assert.deepNestedPropertyVal, true)
     .to.have.deep.nested.property(prop, val);
 };

 /**
  * ### .notDeepNestedPropertyVal(object, property, value, [message])
  *
  * Asserts that `object` does _not_ have a property named by `property` with
  * value given by `value`. `property` can use dot- and bracket-notation for
  * nested reference. Uses a deep equality check.
  *
  *     assert.notDeepNestedPropertyVal({ tea: { green: { matcha: 'yum' } } }, 'tea.green', { oolong: 'yum' });
  *     assert.notDeepNestedPropertyVal({ tea: { green: { matcha: 'yum' } } }, 'tea.green', { matcha: 'yuck' });
  *     assert.notDeepNestedPropertyVal({ tea: { green: { matcha: 'yum' } } }, 'tea.black', { matcha: 'yum' });
  *
  * @name notDeepNestedPropertyVal
  * @param {Object} object
  * @param {String} property
  * @param {Mixed} value
  * @param {String} message
  * @namespace Assert
  * @api public
  */

 assert.notDeepNestedPropertyVal = function (obj, prop, val, msg) {
   new Assertion(obj, msg, assert.notDeepNestedPropertyVal, true)
     .to.not.have.deep.nested.property(prop, val);
 }

 /**
  * ### .lengthOf(object, length, [message])
  *
  * Asserts that `object` has a `length` or `size` with the expected value.
  *
  *     assert.lengthOf([1,2,3], 3, 'array has length of 3');
  *     assert.lengthOf('foobar', 6, 'string has length of 6');
  *     assert.lengthOf(new Set([1,2,3]), 3, 'set has size of 3');
  *     assert.lengthOf(new Map([['a',1],['b',2],['c',3]]), 3, 'map has size of 3');
  *
  * @name lengthOf
  * @param {Mixed} object
  * @param {Number} length
  * @param {String} message
  * @namespace Assert
  * @api public
  */

 assert.lengthOf = function (exp, len, msg) {
   new Assertion(exp, msg, assert.lengthOf, true).to.have.lengthOf(len);
 };

 /**
  * ### .hasAnyKeys(object, [keys], [message])
  *
  * Asserts that `object` has at least one of the `keys` provided.
  * You can also provide a single object instead of a `keys` array and its keys
  * will be used as the expected set of keys.
  *
  *     assert.hasAnyKeys({foo: 1, bar: 2, baz: 3}, ['foo', 'iDontExist', 'baz']);
  *     assert.hasAnyKeys({foo: 1, bar: 2, baz: 3}, {foo: 30, iDontExist: 99, baz: 1337});
  *     assert.hasAnyKeys(new Map([[{foo: 1}, 'bar'], ['key', 'value']]), [{foo: 1}, 'key']);
  *     assert.hasAnyKeys(new Set([{foo: 'bar'}, 'anotherKey']), [{foo: 'bar'}, 'anotherKey']);
  *
  * @name hasAnyKeys
  * @param {Mixed} object
  * @param {Array|Object} keys
  * @param {String} message
  * @namespace Assert
  * @api public
  */

 assert.hasAnyKeys = function (obj, keys, msg) {
   new Assertion(obj, msg, assert.hasAnyKeys, true).to.have.any.keys(keys);
 }

 /**
  * ### .hasAllKeys(object, [keys], [message])
  *
  * Asserts that `object` has all and only all of the `keys` provided.
  * You can also provide a single object instead of a `keys` array and its keys
  * will be used as the expected set of keys.
  *
  *     assert.hasAllKeys({foo: 1, bar: 2, baz: 3}, ['foo', 'bar', 'baz']);
  *     assert.hasAllKeys({foo: 1, bar: 2, baz: 3}, {foo: 30, bar: 99, baz: 1337]);
  *     assert.hasAllKeys(new Map([[{foo: 1}, 'bar'], ['key', 'value']]), [{foo: 1}, 'key']);
  *     assert.hasAllKeys(new Set([{foo: 'bar'}, 'anotherKey'], [{foo: 'bar'}, 'anotherKey']);
  *
  * @name hasAllKeys
  * @param {Mixed} object
  * @param {String[]} keys
  * @param {String} message
  * @namespace Assert
  * @api public
  */

 assert.hasAllKeys = function (obj, keys, msg) {
   new Assertion(obj, msg, assert.hasAllKeys, true).to.have.all.keys(keys);
 }

 /**
  * ### .containsAllKeys(object, [keys], [message])
  *
  * Asserts that `object` has all of the `keys` provided but may have more keys not listed.
  * You can also provide a single object instead of a `keys` array and its keys
  * will be used as the expected set of keys.
  *
  *     assert.containsAllKeys({foo: 1, bar: 2, baz: 3}, ['foo', 'baz']);
  *     assert.containsAllKeys({foo: 1, bar: 2, baz: 3}, ['foo', 'bar', 'baz']);
  *     assert.containsAllKeys({foo: 1, bar: 2, baz: 3}, {foo: 30, baz: 1337});
  *     assert.containsAllKeys({foo: 1, bar: 2, baz: 3}, {foo: 30, bar: 99, baz: 1337});
  *     assert.containsAllKeys(new Map([[{foo: 1}, 'bar'], ['key', 'value']]), [{foo: 1}]);
  *     assert.containsAllKeys(new Map([[{foo: 1}, 'bar'], ['key', 'value']]), [{foo: 1}, 'key']);
  *     assert.containsAllKeys(new Set([{foo: 'bar'}, 'anotherKey'], [{foo: 'bar'}]);
  *     assert.containsAllKeys(new Set([{foo: 'bar'}, 'anotherKey'], [{foo: 'bar'}, 'anotherKey']);
  *
  * @name containsAllKeys
  * @param {Mixed} object
  * @param {String[]} keys
  * @param {String} message
  * @namespace Assert
  * @api public
  */

 assert.containsAllKeys = function (obj, keys, msg) {
   new Assertion(obj, msg, assert.containsAllKeys, true)
     .to.contain.all.keys(keys);
 }

 /**
  * ### .doesNotHaveAnyKeys(object, [keys], [message])
  *
  * Asserts that `object` has none of the `keys` provided.
  * You can also provide a single object instead of a `keys` array and its keys
  * will be used as the expected set of keys.
  *
  *     assert.doesNotHaveAnyKeys({foo: 1, bar: 2, baz: 3}, ['one', 'two', 'example']);
  *     assert.doesNotHaveAnyKeys({foo: 1, bar: 2, baz: 3}, {one: 1, two: 2, example: 'foo'});
  *     assert.doesNotHaveAnyKeys(new Map([[{foo: 1}, 'bar'], ['key', 'value']]), [{one: 'two'}, 'example']);
  *     assert.doesNotHaveAnyKeys(new Set([{foo: 'bar'}, 'anotherKey'], [{one: 'two'}, 'example']);
  *
  * @name doesNotHaveAnyKeys
  * @param {Mixed} object
  * @param {String[]} keys
  * @param {String} message
  * @namespace Assert
  * @api public
  */

 assert.doesNotHaveAnyKeys = function (obj, keys, msg) {
   new Assertion(obj, msg, assert.doesNotHaveAnyKeys, true)
     .to.not.have.any.keys(keys);
 }

 /**
  * ### .doesNotHaveAllKeys(object, [keys], [message])
  *
  * Asserts that `object` does not have at least one of the `keys` provided.
  * You can also provide a single object instead of a `keys` array and its keys
  * will be used as the expected set of keys.
  *
  *     assert.doesNotHaveAllKeys({foo: 1, bar: 2, baz: 3}, ['one', 'two', 'example']);
  *     assert.doesNotHaveAllKeys({foo: 1, bar: 2, baz: 3}, {one: 1, two: 2, example: 'foo'});
  *     assert.doesNotHaveAllKeys(new Map([[{foo: 1}, 'bar'], ['key', 'value']]), [{one: 'two'}, 'example']);
  *     assert.doesNotHaveAllKeys(new Set([{foo: 'bar'}, 'anotherKey'], [{one: 'two'}, 'example']);
  *
  * @name doesNotHaveAllKeys
  * @param {Mixed} object
  * @param {String[]} keys
  * @param {String} message
  * @namespace Assert
  * @api public
  */

 assert.doesNotHaveAllKeys = function (obj, keys, msg) {
   new Assertion(obj, msg, assert.doesNotHaveAllKeys, true)
     .to.not.have.all.keys(keys);
 }

 /**
  * ### .hasAnyDeepKeys(object, [keys], [message])
  *
  * Asserts that `object` has at least one of the `keys` provided.
  * Since Sets and Maps can have objects as keys you can use this assertion to perform
  * a deep comparison.
  * You can also provide a single object instead of a `keys` array and its keys
  * will be used as the expected set of keys.
  *
  *     assert.hasAnyDeepKeys(new Map([[{one: 'one'}, 'valueOne'], [1, 2]]), {one: 'one'});
  *     assert.hasAnyDeepKeys(new Map([[{one: 'one'}, 'valueOne'], [1, 2]]), [{one: 'one'}, {two: 'two'}]);
  *     assert.hasAnyDeepKeys(new Map([[{one: 'one'}, 'valueOne'], [{two: 'two'}, 'valueTwo']]), [{one: 'one'}, {two: 'two'}]);
  *     assert.hasAnyDeepKeys(new Set([{one: 'one'}, {two: 'two'}]), {one: 'one'});
  *     assert.hasAnyDeepKeys(new Set([{one: 'one'}, {two: 'two'}]), [{one: 'one'}, {three: 'three'}]);
  *     assert.hasAnyDeepKeys(new Set([{one: 'one'}, {two: 'two'}]), [{one: 'one'}, {two: 'two'}]);
  *
  * @name doesNotHaveAllKeys
  * @param {Mixed} object
  * @param {Array|Object} keys
  * @param {String} message
  * @namespace Assert
  * @api public
  */

 assert.hasAnyDeepKeys = function (obj, keys, msg) {
   new Assertion(obj, msg, assert.hasAnyDeepKeys, true)
     .to.have.any.deep.keys(keys);
 }

/**
  * ### .hasAllDeepKeys(object, [keys], [message])
  *
  * Asserts that `object` has all and only all of the `keys` provided.
  * Since Sets and Maps can have objects as keys you can use this assertion to perform
  * a deep comparison.
  * You can also provide a single object instead of a `keys` array and its keys
  * will be used as the expected set of keys.
  *
  *     assert.hasAllDeepKeys(new Map([[{one: 'one'}, 'valueOne']]), {one: 'one'});
  *     assert.hasAllDeepKeys(new Map([[{one: 'one'}, 'valueOne'], [{two: 'two'}, 'valueTwo']]), [{one: 'one'}, {two: 'two'}]);
  *     assert.hasAllDeepKeys(new Set([{one: 'one'}]), {one: 'one'});
  *     assert.hasAllDeepKeys(new Set([{one: 'one'}, {two: 'two'}]), [{one: 'one'}, {two: 'two'}]);
  *
  * @name hasAllDeepKeys
  * @param {Mixed} object
  * @param {Array|Object} keys
  * @param {String} message
  * @namespace Assert
  * @api public
  */

 assert.hasAllDeepKeys = function (obj, keys, msg) {
   new Assertion(obj, msg, assert.hasAllDeepKeys, true)
     .to.have.all.deep.keys(keys);
 }

/**
  * ### .containsAllDeepKeys(object, [keys], [message])
  *
  * Asserts that `object` contains all of the `keys` provided.
  * Since Sets and Maps can have objects as keys you can use this assertion to perform
  * a deep comparison.
  * You can also provide a single object instead of a `keys` array and its keys
  * will be used as the expected set of keys.
  *
  *     assert.containsAllDeepKeys(new Map([[{one: 'one'}, 'valueOne'], [1, 2]]), {one: 'one'});
  *     assert.containsAllDeepKeys(new Map([[{one: 'one'}, 'valueOne'], [{two: 'two'}, 'valueTwo']]), [{one: 'one'}, {two: 'two'}]);
  *     assert.containsAllDeepKeys(new Set([{one: 'one'}, {two: 'two'}]), {one: 'one'});
  *     assert.containsAllDeepKeys(new Set([{one: 'one'}, {two: 'two'}]), [{one: 'one'}, {two: 'two'}]);
  *
  * @name containsAllDeepKeys
  * @param {Mixed} object
  * @param {Array|Object} keys
  * @param {String} message
  * @namespace Assert
  * @api public
  */

 assert.containsAllDeepKeys = function (obj, keys, msg) {
   new Assertion(obj, msg, assert.containsAllDeepKeys, true)
     .to.contain.all.deep.keys(keys);
 }

/**
  * ### .doesNotHaveAnyDeepKeys(object, [keys], [message])
  *
  * Asserts that `object` has none of the `keys` provided.
  * Since Sets and Maps can have objects as keys you can use this assertion to perform
  * a deep comparison.
  * You can also provide a single object instead of a `keys` array and its keys
  * will be used as the expected set of keys.
  *
  *     assert.doesNotHaveAnyDeepKeys(new Map([[{one: 'one'}, 'valueOne'], [1, 2]]), {thisDoesNot: 'exist'});
  *     assert.doesNotHaveAnyDeepKeys(new Map([[{one: 'one'}, 'valueOne'], [{two: 'two'}, 'valueTwo']]), [{twenty: 'twenty'}, {fifty: 'fifty'}]);
  *     assert.doesNotHaveAnyDeepKeys(new Set([{one: 'one'}, {two: 'two'}]), {twenty: 'twenty'});
  *     assert.doesNotHaveAnyDeepKeys(new Set([{one: 'one'}, {two: 'two'}]), [{twenty: 'twenty'}, {fifty: 'fifty'}]);
  *
  * @name doesNotHaveAnyDeepKeys
  * @param {Mixed} object
  * @param {Array|Object} keys
  * @param {String} message
  * @namespace Assert
  * @api public
  */

 assert.doesNotHaveAnyDeepKeys = function (obj, keys, msg) {
   new Assertion(obj, msg, assert.doesNotHaveAnyDeepKeys, true)
     .to.not.have.any.deep.keys(keys);
 }

/**
  * ### .doesNotHaveAllDeepKeys(object, [keys], [message])
  *
  * Asserts that `object` does not have at least one of the `keys` provided.
  * Since Sets and Maps can have objects as keys you can use this assertion to perform
  * a deep comparison.
  * You can also provide a single object instead of a `keys` array and its keys
  * will be used as the expected set of keys.
  *
  *     assert.doesNotHaveAllDeepKeys(new Map([[{one: 'one'}, 'valueOne'], [1, 2]]), {thisDoesNot: 'exist'});
  *     assert.doesNotHaveAllDeepKeys(new Map([[{one: 'one'}, 'valueOne'], [{two: 'two'}, 'valueTwo']]), [{twenty: 'twenty'}, {one: 'one'}]);
  *     assert.doesNotHaveAllDeepKeys(new Set([{one: 'one'}, {two: 'two'}]), {twenty: 'twenty'});
  *     assert.doesNotHaveAllDeepKeys(new Set([{one: 'one'}, {two: 'two'}]), [{one: 'one'}, {fifty: 'fifty'}]);
  *
  * @name doesNotHaveAllDeepKeys
  * @param {Mixed} object
  * @param {Array|Object} keys
  * @param {String} message
  * @namespace Assert
  * @api public
  */

 assert.doesNotHaveAllDeepKeys = function (obj, keys, msg) {
   new Assertion(obj, msg, assert.doesNotHaveAllDeepKeys, true)
     .to.not.have.all.deep.keys(keys);
 }

/**
  * ### .throws(fn, [errorLike/string/regexp], [string/regexp], [message])
  *
  * If `errorLike` is an `Error` constructor, asserts that `fn` will throw an error that is an
  * instance of `errorLike`.
  * If `errorLike` is an `Error` instance, asserts that the error thrown is the same
  * instance as `errorLike`.
  * If `errMsgMatcher` is provided, it also asserts that the error thrown will have a
  * message matching `errMsgMatcher`.
  *
  *     assert.throws(fn, 'Error thrown must have this msg');
  *     assert.throws(fn, /Error thrown must have a msg that matches this/);
  *     assert.throws(fn, ReferenceError);
  *     assert.throws(fn, errorInstance);
  *     assert.throws(fn, ReferenceError, 'Error thrown must be a ReferenceError and have this msg');
  *     assert.throws(fn, errorInstance, 'Error thrown must be the same errorInstance and have this msg');
  *     assert.throws(fn, ReferenceError, /Error thrown must be a ReferenceError and match this/);
  *     assert.throws(fn, errorInstance, /Error thrown must be the same errorInstance and match this/);
  *
  * @name throws
  * @alias throw
  * @alias Throw
  * @param {Function} fn
  * @param {ErrorConstructor|Error} errorLike
  * @param {RegExp|String} errMsgMatcher
  * @param {String} message
  * @see https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Error#Error_types
  * @namespace Assert
  * @api public
  */

 assert.throws = function (fn, errorLike, errMsgMatcher, msg) {
   if ('string' === typeof errorLike || errorLike instanceof RegExp) {
     errMsgMatcher = errorLike;
     errorLike = null;
   }

   var assertErr = new Assertion(fn, msg, assert.throws, true)
     .to.throw(errorLike, errMsgMatcher);
   return flag(assertErr, 'object');
 };

 /**
  * ### .doesNotThrow(fn, [errorLike/string/regexp], [string/regexp], [message])
  *
  * If `errorLike` is an `Error` constructor, asserts that `fn` will _not_ throw an error that is an
  * instance of `errorLike`.
  * If `errorLike` is an `Error` instance, asserts that the error thrown is _not_ the same
  * instance as `errorLike`.
  * If `errMsgMatcher` is provided, it also asserts that the error thrown will _not_ have a
  * message matching `errMsgMatcher`.
  *
  *     assert.doesNotThrow(fn, 'Any Error thrown must not have this message');
  *     assert.doesNotThrow(fn, /Any Error thrown must not match this/);
  *     assert.doesNotThrow(fn, Error);
  *     assert.doesNotThrow(fn, errorInstance);
  *     assert.doesNotThrow(fn, Error, 'Error must not have this message');
  *     assert.doesNotThrow(fn, errorInstance, 'Error must not have this message');
  *     assert.doesNotThrow(fn, Error, /Error must not match this/);
  *     assert.doesNotThrow(fn, errorInstance, /Error must not match this/);
  *
  * @name doesNotThrow
  * @param {Function} fn
  * @param {ErrorConstructor} errorLike
  * @param {RegExp|String} errMsgMatcher
  * @param {String} message
  * @see https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Error#Error_types
  * @namespace Assert
  * @api public
  */

 assert.doesNotThrow = function (fn, errorLike, errMsgMatcher, msg) {
   if ('string' === typeof errorLike || errorLike instanceof RegExp) {
     errMsgMatcher = errorLike;
     errorLike = null;
   }

   new Assertion(fn, msg, assert.doesNotThrow, true)
     .to.not.throw(errorLike, errMsgMatcher);
 };

 /**
  * ### .operator(val1, operator, val2, [message])
  *
  * Compares two values using `operator`.
  *
  *     assert.operator(1, '<', 2, 'everything is ok');
  *     assert.operator(1, '>', 2, 'this will fail');
  *
  * @name operator
  * @param {Mixed} val1
  * @param {String} operator
  * @param {Mixed} val2
  * @param {String} message
  * @namespace Assert
  * @api public
  */

 assert.operator = function (val, operator, val2, msg) {
   var ok;
   switch(operator) {
     case '==':
       ok = val == val2;
       break;
     case '===':
       ok = val === val2;
       break;
     case '>':
       ok = val > val2;
       break;
     case '>=':
       ok = val >= val2;
       break;
     case '<':
       ok = val < val2;
       break;
     case '<=':
       ok = val <= val2;
       break;
     case '!=':
       ok = val != val2;
       break;
     case '!==':
       ok = val !== val2;
       break;
     default:
       msg = msg ? msg + ': ' : msg;
       throw new chai.AssertionError(
         msg + 'Invalid operator "' + operator + '"',
         undefined,
         assert.operator
       );
   }
   var test = new Assertion(ok, msg, assert.operator, true);
   test.assert(
       true === flag(test, 'object')
     , 'expected ' + util.inspect(val) + ' to be ' + operator + ' ' + util.inspect(val2)
     , 'expected ' + util.inspect(val) + ' to not be ' + operator + ' ' + util.inspect(val2) );
 };

 /**
  * ### .closeTo(actual, expected, delta, [message])
  *
  * Asserts that the target is equal `expected`, to within a +/- `delta` range.
  *
  *     assert.closeTo(1.5, 1, 0.5, 'numbers are close');
  *
  * @name closeTo
  * @param {Number} actual
  * @param {Number} expected
  * @param {Number} delta
  * @param {String} message
  * @namespace Assert
  * @api public
  */

 assert.closeTo = function (act, exp, delta, msg) {
   new Assertion(act, msg, assert.closeTo, true).to.be.closeTo(exp, delta);
 };

 /**
  * ### .approximately(actual, expected, delta, [message])
  *
  * Asserts that the target is equal `expected`, to within a +/- `delta` range.
  *
  *     assert.approximately(1.5, 1, 0.5, 'numbers are close');
  *
  * @name approximately
  * @param {Number} actual
  * @param {Number} expected
  * @param {Number} delta
  * @param {String} message
  * @namespace Assert
  * @api public
  */

 assert.approximately = function (act, exp, delta, msg) {
   new Assertion(act, msg, assert.approximately, true)
     .to.be.approximately(exp, delta);
 };

 /**
  * ### .sameMembers(set1, set2, [message])
  *
  * Asserts that `set1` and `set2` have the same members in any order. Uses a
  * strict equality check (===).
  *
  *     assert.sameMembers([ 1, 2, 3 ], [ 2, 1, 3 ], 'same members');
  *
  * @name sameMembers
  * @param {Array} set1
  * @param {Array} set2
  * @param {String} message
  * @namespace Assert
  * @api public
  */

 assert.sameMembers = function (set1, set2, msg) {
   new Assertion(set1, msg, assert.sameMembers, true)
     .to.have.same.members(set2);
 }

 /**
  * ### .notSameMembers(set1, set2, [message])
  *
  * Asserts that `set1` and `set2` don't have the same members in any order.
  * Uses a strict equality check (===).
  *
  *     assert.notSameMembers([ 1, 2, 3 ], [ 5, 1, 3 ], 'not same members');
  *
  * @name notSameMembers
  * @param {Array} set1
  * @param {Array} set2
  * @param {String} message
  * @namespace Assert
  * @api public
  */

 assert.notSameMembers = function (set1, set2, msg) {
   new Assertion(set1, msg, assert.notSameMembers, true)
     .to.not.have.same.members(set2);
 }

 /**
  * ### .sameDeepMembers(set1, set2, [message])
  *
  * Asserts that `set1` and `set2` have the same members in any order. Uses a
  * deep equality check.
  *
  *     assert.sameDeepMembers([ { a: 1 }, { b: 2 }, { c: 3 } ], [{ b: 2 }, { a: 1 }, { c: 3 }], 'same deep members');
  *
  * @name sameDeepMembers
  * @param {Array} set1
  * @param {Array} set2
  * @param {String} message
  * @namespace Assert
  * @api public
  */

 assert.sameDeepMembers = function (set1, set2, msg) {
   new Assertion(set1, msg, assert.sameDeepMembers, true)
     .to.have.same.deep.members(set2);
 }

 /**
  * ### .notSameDeepMembers(set1, set2, [message])
  *
  * Asserts that `set1` and `set2` don't have the same members in any order.
  * Uses a deep equality check.
  *
  *     assert.notSameDeepMembers([ { a: 1 }, { b: 2 }, { c: 3 } ], [{ b: 2 }, { a: 1 }, { f: 5 }], 'not same deep members');
  *
  * @name notSameDeepMembers
  * @param {Array} set1
  * @param {Array} set2
  * @param {String} message
  * @namespace Assert
  * @api public
  */

 assert.notSameDeepMembers = function (set1, set2, msg) {
   new Assertion(set1, msg, assert.notSameDeepMembers, true)
     .to.not.have.same.deep.members(set2);
 }

 /**
  * ### .sameOrderedMembers(set1, set2, [message])
  *
  * Asserts that `set1` and `set2` have the same members in the same order.
  * Uses a strict equality check (===).
  *
  *     assert.sameOrderedMembers([ 1, 2, 3 ], [ 1, 2, 3 ], 'same ordered members');
  *
  * @name sameOrderedMembers
  * @param {Array} set1
  * @param {Array} set2
  * @param {String} message
  * @namespace Assert
  * @api public
  */

 assert.sameOrderedMembers = function (set1, set2, msg) {
   new Assertion(set1, msg, assert.sameOrderedMembers, true)
     .to.have.same.ordered.members(set2);
 }

 /**
  * ### .notSameOrderedMembers(set1, set2, [message])
  *
  * Asserts that `set1` and `set2` don't have the same members in the same
  * order. Uses a strict equality check (===).
  *
  *     assert.notSameOrderedMembers([ 1, 2, 3 ], [ 2, 1, 3 ], 'not same ordered members');
  *
  * @name notSameOrderedMembers
  * @param {Array} set1
  * @param {Array} set2
  * @param {String} message
  * @namespace Assert
  * @api public
  */

 assert.notSameOrderedMembers = function (set1, set2, msg) {
   new Assertion(set1, msg, assert.notSameOrderedMembers, true)
     .to.not.have.same.ordered.members(set2);
 }

 /**
  * ### .sameDeepOrderedMembers(set1, set2, [message])
  *
  * Asserts that `set1` and `set2` have the same members in the same order.
  * Uses a deep equality check.
  *
  * assert.sameDeepOrderedMembers([ { a: 1 }, { b: 2 }, { c: 3 } ], [ { a: 1 }, { b: 2 }, { c: 3 } ], 'same deep ordered members');
  *
  * @name sameDeepOrderedMembers
  * @param {Array} set1
  * @param {Array} set2
  * @param {String} message
  * @namespace Assert
  * @api public
  */

 assert.sameDeepOrderedMembers = function (set1, set2, msg) {
   new Assertion(set1, msg, assert.sameDeepOrderedMembers, true)
     .to.have.same.deep.ordered.members(set2);
 }

 /**
  * ### .notSameDeepOrderedMembers(set1, set2, [message])
  *
  * Asserts that `set1` and `set2` don't have the same members in the same
  * order. Uses a deep equality check.
  *
  * assert.notSameDeepOrderedMembers([ { a: 1 }, { b: 2 }, { c: 3 } ], [ { a: 1 }, { b: 2 }, { z: 5 } ], 'not same deep ordered members');
  * assert.notSameDeepOrderedMembers([ { a: 1 }, { b: 2 }, { c: 3 } ], [ { b: 2 }, { a: 1 }, { c: 3 } ], 'not same deep ordered members');
  *
  * @name notSameDeepOrderedMembers
  * @param {Array} set1
  * @param {Array} set2
  * @param {String} message
  * @namespace Assert
  * @api public
  */

 assert.notSameDeepOrderedMembers = function (set1, set2, msg) {
   new Assertion(set1, msg, assert.notSameDeepOrderedMembers, true)
     .to.not.have.same.deep.ordered.members(set2);
 }

 /**
  * ### .includeMembers(superset, subset, [message])
  *
  * Asserts that `subset` is included in `superset` in any order. Uses a
  * strict equality check (===). Duplicates are ignored.
  *
  *     assert.includeMembers([ 1, 2, 3 ], [ 2, 1, 2 ], 'include members');
  *
  * @name includeMembers
  * @param {Array} superset
  * @param {Array} subset
  * @param {String} message
  * @namespace Assert
  * @api public
  */

 assert.includeMembers = function (superset, subset, msg) {
   new Assertion(superset, msg, assert.includeMembers, true)
     .to.include.members(subset);
 }

 /**
  * ### .notIncludeMembers(superset, subset, [message])
  *
  * Asserts that `subset` isn't included in `superset` in any order. Uses a
  * strict equality check (===). Duplicates are ignored.
  *
  *     assert.notIncludeMembers([ 1, 2, 3 ], [ 5, 1 ], 'not include members');
  *
  * @name notIncludeMembers
  * @param {Array} superset
  * @param {Array} subset
  * @param {String} message
  * @namespace Assert
  * @api public
  */

 assert.notIncludeMembers = function (superset, subset, msg) {
   new Assertion(superset, msg, assert.notIncludeMembers, true)
     .to.not.include.members(subset);
 }

 /**
  * ### .includeDeepMembers(superset, subset, [message])
  *
  * Asserts that `subset` is included in `superset` in any order. Uses a deep
  * equality check. Duplicates are ignored.
  *
  *     assert.includeDeepMembers([ { a: 1 }, { b: 2 }, { c: 3 } ], [ { b: 2 }, { a: 1 }, { b: 2 } ], 'include deep members');
  *
  * @name includeDeepMembers
  * @param {Array} superset
  * @param {Array} subset
  * @param {String} message
  * @namespace Assert
  * @api public
  */

 assert.includeDeepMembers = function (superset, subset, msg) {
   new Assertion(superset, msg, assert.includeDeepMembers, true)
     .to.include.deep.members(subset);
 }

 /**
  * ### .notIncludeDeepMembers(superset, subset, [message])
  *
  * Asserts that `subset` isn't included in `superset` in any order. Uses a
  * deep equality check. Duplicates are ignored.
  *
  *     assert.notIncludeDeepMembers([ { a: 1 }, { b: 2 }, { c: 3 } ], [ { b: 2 }, { f: 5 } ], 'not include deep members');
  *
  * @name notIncludeDeepMembers
  * @param {Array} superset
  * @param {Array} subset
  * @param {String} message
  * @namespace Assert
  * @api public
  */

 assert.notIncludeDeepMembers = function (superset, subset, msg) {
   new Assertion(superset, msg, assert.notIncludeDeepMembers, true)
     .to.not.include.deep.members(subset);
 }

 /**
  * ### .includeOrderedMembers(superset, subset, [message])
  *
  * Asserts that `subset` is included in `superset` in the same order
  * beginning with the first element in `superset`. Uses a strict equality
  * check (===).
  *
  *     assert.includeOrderedMembers([ 1, 2, 3 ], [ 1, 2 ], 'include ordered members');
  *
  * @name includeOrderedMembers
  * @param {Array} superset
  * @param {Array} subset
  * @param {String} message
  * @namespace Assert
  * @api public
  */

 assert.includeOrderedMembers = function (superset, subset, msg) {
   new Assertion(superset, msg, assert.includeOrderedMembers, true)
     .to.include.ordered.members(subset);
 }

 /**
  * ### .notIncludeOrderedMembers(superset, subset, [message])
  *
  * Asserts that `subset` isn't included in `superset` in the same order
  * beginning with the first element in `superset`. Uses a strict equality
  * check (===).
  *
  *     assert.notIncludeOrderedMembers([ 1, 2, 3 ], [ 2, 1 ], 'not include ordered members');
  *     assert.notIncludeOrderedMembers([ 1, 2, 3 ], [ 2, 3 ], 'not include ordered members');
  *
  * @name notIncludeOrderedMembers
  * @param {Array} superset
  * @param {Array} subset
  * @param {String} message
  * @namespace Assert
  * @api public
  */

 assert.notIncludeOrderedMembers = function (superset, subset, msg) {
   new Assertion(superset, msg, assert.notIncludeOrderedMembers, true)
     .to.not.include.ordered.members(subset);
 }

 /**
  * ### .includeDeepOrderedMembers(superset, subset, [message])
  *
  * Asserts that `subset` is included in `superset` in the same order
  * beginning with the first element in `superset`. Uses a deep equality
  * check.
  *
  *     assert.includeDeepOrderedMembers([ { a: 1 }, { b: 2 }, { c: 3 } ], [ { a: 1 }, { b: 2 } ], 'include deep ordered members');
  *
  * @name includeDeepOrderedMembers
  * @param {Array} superset
  * @param {Array} subset
  * @param {String} message
  * @namespace Assert
  * @api public
  */

 assert.includeDeepOrderedMembers = function (superset, subset, msg) {
   new Assertion(superset, msg, assert.includeDeepOrderedMembers, true)
     .to.include.deep.ordered.members(subset);
 }

 /**
  * ### .notIncludeDeepOrderedMembers(superset, subset, [message])
  *
  * Asserts that `subset` isn't included in `superset` in the same order
  * beginning with the first element in `superset`. Uses a deep equality
  * check.
  *
  *     assert.notIncludeDeepOrderedMembers([ { a: 1 }, { b: 2 }, { c: 3 } ], [ { a: 1 }, { f: 5 } ], 'not include deep ordered members');
  *     assert.notIncludeDeepOrderedMembers([ { a: 1 }, { b: 2 }, { c: 3 } ], [ { b: 2 }, { a: 1 } ], 'not include deep ordered members');
  *     assert.notIncludeDeepOrderedMembers([ { a: 1 }, { b: 2 }, { c: 3 } ], [ { b: 2 }, { c: 3 } ], 'not include deep ordered members');
  *
  * @name notIncludeDeepOrderedMembers
  * @param {Array} superset
  * @param {Array} subset
  * @param {String} message
  * @namespace Assert
  * @api public
  */

 assert.notIncludeDeepOrderedMembers = function (superset, subset, msg) {
   new Assertion(superset, msg, assert.notIncludeDeepOrderedMembers, true)
     .to.not.include.deep.ordered.members(subset);
 }

 /**
  * ### .oneOf(inList, list, [message])
  *
  * Asserts that non-object, non-array value `inList` appears in the flat array `list`.
  *
  *     assert.oneOf(1, [ 2, 1 ], 'Not found in list');
  *
  * @name oneOf
  * @param {*} inList
  * @param {Array<*>} list
  * @param {String} message
  * @namespace Assert
  * @api public
  */

 assert.oneOf = function (inList, list, msg) {
   new Assertion(inList, msg, assert.oneOf, true).to.be.oneOf(list);
 }

 /**
  * ### .changes(function, object, property, [message])
  *
  * Asserts that a function changes the value of a property.
  *
  *     var obj = { val: 10 };
  *     var fn = function() { obj.val = 22 };
  *     assert.changes(fn, obj, 'val');
  *
  * @name changes
  * @param {Function} modifier function
  * @param {Object} object or getter function
  * @param {String} property name _optional_
  * @param {String} message _optional_
  * @namespace Assert
  * @api public
  */

 assert.changes = function (fn, obj, prop, msg) {
   if (arguments.length === 3 && typeof obj === 'function') {
     msg = prop;
     prop = null;
   }

   new Assertion(fn, msg, assert.changes, true).to.change(obj, prop);
 }

  /**
  * ### .changesBy(function, object, property, delta, [message])
  *
  * Asserts that a function changes the value of a property by an amount (delta).
  *
  *     var obj = { val: 10 };
  *     var fn = function() { obj.val += 2 };
  *     assert.changesBy(fn, obj, 'val', 2);
  *
  * @name changesBy
  * @param {Function} modifier function
  * @param {Object} object or getter function
  * @param {String} property name _optional_
  * @param {Number} change amount (delta)
  * @param {String} message _optional_
  * @namespace Assert
  * @api public
  */

 assert.changesBy = function (fn, obj, prop, delta, msg) {
   if (arguments.length === 4 && typeof obj === 'function') {
     var tmpMsg = delta;
     delta = prop;
     msg = tmpMsg;
   } else if (arguments.length === 3) {
     delta = prop;
     prop = null;
   }

   new Assertion(fn, msg, assert.changesBy, true)
     .to.change(obj, prop).by(delta);
 }

  /**
  * ### .doesNotChange(function, object, property, [message])
  *
  * Asserts that a function does not change the value of a property.
  *
  *     var obj = { val: 10 };
  *     var fn = function() { console.log('foo'); };
  *     assert.doesNotChange(fn, obj, 'val');
  *
  * @name doesNotChange
  * @param {Function} modifier function
  * @param {Object} object or getter function
  * @param {String} property name _optional_
  * @param {String} message _optional_
  * @namespace Assert
  * @api public
  */

 assert.doesNotChange = function (fn, obj, prop, msg) {
   if (arguments.length === 3 && typeof obj === 'function') {
     msg = prop;
     prop = null;
   }

   return new Assertion(fn, msg, assert.doesNotChange, true)
     .to.not.change(obj, prop);
 }

 /**
  * ### .changesButNotBy(function, object, property, delta, [message])
  *
  * Asserts that a function does not change the value of a property or of a function's return value by an amount (delta)
  *
  *     var obj = { val: 10 };
  *     var fn = function() { obj.val += 10 };
  *     assert.changesButNotBy(fn, obj, 'val', 5);
  *
  * @name changesButNotBy
  * @param {Function} modifier function
  * @param {Object} object or getter function
  * @param {String} property name _optional_
  * @param {Number} change amount (delta)
  * @param {String} message _optional_
  * @namespace Assert
  * @api public
  */

 assert.changesButNotBy = function (fn, obj, prop, delta, msg) {
   if (arguments.length === 4 && typeof obj === 'function') {
     var tmpMsg = delta;
     delta = prop;
     msg = tmpMsg;
   } else if (arguments.length === 3) {
     delta = prop;
     prop = null;
   }

   new Assertion(fn, msg, assert.changesButNotBy, true)
     .to.change(obj, prop).but.not.by(delta);
 }

 /**
  * ### .increases(function, object, property, [message])
  *
  * Asserts that a function increases a numeric object property.
  *
  *     var obj = { val: 10 };
  *     var fn = function() { obj.val = 13 };
  *     assert.increases(fn, obj, 'val');
  *
  * @name increases
  * @param {Function} modifier function
  * @param {Object} object or getter function
  * @param {String} property name _optional_
  * @param {String} message _optional_
  * @namespace Assert
  * @api public
  */

 assert.increases = function (fn, obj, prop, msg) {
   if (arguments.length === 3 && typeof obj === 'function') {
     msg = prop;
     prop = null;
   }

   return new Assertion(fn, msg, assert.increases, true)
     .to.increase(obj, prop);
 }

 /**
  * ### .increasesBy(function, object, property, delta, [message])
  *
  * Asserts that a function increases a numeric object property or a function's return value by an amount (delta).
  *
  *     var obj = { val: 10 };
  *     var fn = function() { obj.val += 10 };
  *     assert.increasesBy(fn, obj, 'val', 10);
  *
  * @name increasesBy
  * @param {Function} modifier function
  * @param {Object} object or getter function
  * @param {String} property name _optional_
  * @param {Number} change amount (delta)
  * @param {String} message _optional_
  * @namespace Assert
  * @api public
  */

 assert.increasesBy = function (fn, obj, prop, delta, msg) {
   if (arguments.length === 4 && typeof obj === 'function') {
     var tmpMsg = delta;
     delta = prop;
     msg = tmpMsg;
   } else if (arguments.length === 3) {
     delta = prop;
     prop = null;
   }

   new Assertion(fn, msg, assert.increasesBy, true)
     .to.increase(obj, prop).by(delta);
 }

 /**
  * ### .doesNotIncrease(function, object, property, [message])
  *
  * Asserts that a function does not increase a numeric object property.
  *
  *     var obj = { val: 10 };
  *     var fn = function() { obj.val = 8 };
  *     assert.doesNotIncrease(fn, obj, 'val');
  *
  * @name doesNotIncrease
  * @param {Function} modifier function
  * @param {Object} object or getter function
  * @param {String} property name _optional_
  * @param {String} message _optional_
  * @namespace Assert
  * @api public
  */

 assert.doesNotIncrease = function (fn, obj, prop, msg) {
   if (arguments.length === 3 && typeof obj === 'function') {
     msg = prop;
     prop = null;
   }

   return new Assertion(fn, msg, assert.doesNotIncrease, true)
     .to.not.increase(obj, prop);
 }

 /**
  * ### .increasesButNotBy(function, object, property, [message])
  *
  * Asserts that a function does not increase a numeric object property or function's return value by an amount (delta).
  *
  *     var obj = { val: 10 };
  *     var fn = function() { obj.val = 15 };
  *     assert.increasesButNotBy(fn, obj, 'val', 10);
  *
  * @name increasesButNotBy
  * @param {Function} modifier function
  * @param {Object} object or getter function
  * @param {String} property name _optional_
  * @param {Number} change amount (delta)
  * @param {String} message _optional_
  * @namespace Assert
  * @api public
  */

 assert.increasesButNotBy = function (fn, obj, prop, delta, msg) {
   if (arguments.length === 4 && typeof obj === 'function') {
     var tmpMsg = delta;
     delta = prop;
     msg = tmpMsg;
   } else if (arguments.length === 3) {
     delta = prop;
     prop = null;
   }

   new Assertion(fn, msg, assert.increasesButNotBy, true)
     .to.increase(obj, prop).but.not.by(delta);
 }

 /**
  * ### .decreases(function, object, property, [message])
  *
  * Asserts that a function decreases a numeric object property.
  *
  *     var obj = { val: 10 };
  *     var fn = function() { obj.val = 5 };
  *     assert.decreases(fn, obj, 'val');
  *
  * @name decreases
  * @param {Function} modifier function
  * @param {Object} object or getter function
  * @param {String} property name _optional_
  * @param {String} message _optional_
  * @namespace Assert
  * @api public
  */

 assert.decreases = function (fn, obj, prop, msg) {
   if (arguments.length === 3 && typeof obj === 'function') {
     msg = prop;
     prop = null;
   }

   return new Assertion(fn, msg, assert.decreases, true)
     .to.decrease(obj, prop);
 }

 /**
  * ### .decreasesBy(function, object, property, delta, [message])
  *
  * Asserts that a function decreases a numeric object property or a function's return value by an amount (delta)
  *
  *     var obj = { val: 10 };
  *     var fn = function() { obj.val -= 5 };
  *     assert.decreasesBy(fn, obj, 'val', 5);
  *
  * @name decreasesBy
  * @param {Function} modifier function
  * @param {Object} object or getter function
  * @param {String} property name _optional_
  * @param {Number} change amount (delta)
  * @param {String} message _optional_
  * @namespace Assert
  * @api public
  */

 assert.decreasesBy = function (fn, obj, prop, delta, msg) {
   if (arguments.length === 4 && typeof obj === 'function') {
     var tmpMsg = delta;
     delta = prop;
     msg = tmpMsg;
   } else if (arguments.length === 3) {
     delta = prop;
     prop = null;
   }

   new Assertion(fn, msg, assert.decreasesBy, true)
     .to.decrease(obj, prop).by(delta);
 }

 /**
  * ### .doesNotDecrease(function, object, property, [message])
  *
  * Asserts that a function does not decreases a numeric object property.
  *
  *     var obj = { val: 10 };
  *     var fn = function() { obj.val = 15 };
  *     assert.doesNotDecrease(fn, obj, 'val');
  *
  * @name doesNotDecrease
  * @param {Function} modifier function
  * @param {Object} object or getter function
  * @param {String} property name _optional_
  * @param {String} message _optional_
  * @namespace Assert
  * @api public
  */

 assert.doesNotDecrease = function (fn, obj, prop, msg) {
   if (arguments.length === 3 && typeof obj === 'function') {
     msg = prop;
     prop = null;
   }

   return new Assertion(fn, msg, assert.doesNotDecrease, true)
     .to.not.decrease(obj, prop);
 }

 /**
  * ### .doesNotDecreaseBy(function, object, property, delta, [message])
  *
  * Asserts that a function does not decreases a numeric object property or a function's return value by an amount (delta)
  *
  *     var obj = { val: 10 };
  *     var fn = function() { obj.val = 5 };
  *     assert.doesNotDecreaseBy(fn, obj, 'val', 1);
  *
  * @name doesNotDecrease
  * @param {Function} modifier function
  * @param {Object} object or getter function
  * @param {String} property name _optional_
  * @param {Number} change amount (delta)
  * @param {String} message _optional_
  * @namespace Assert
  * @api public
  */

 assert.doesNotDecreaseBy = function (fn, obj, prop, delta, msg) {
   if (arguments.length === 4 && typeof obj === 'function') {
     var tmpMsg = delta;
     delta = prop;
     msg = tmpMsg;
   } else if (arguments.length === 3) {
     delta = prop;
     prop = null;
   }

   return new Assertion(fn, msg, assert.doesNotDecreaseBy, true)
     .to.not.decrease(obj, prop).by(delta);
 }

 /**
  * ### .decreasesButNotBy(function, object, property, delta, [message])
  *
  * Asserts that a function does not decreases a numeric object property or a function's return value by an amount (delta)
  *
  *     var obj = { val: 10 };
  *     var fn = function() { obj.val = 5 };
  *     assert.decreasesButNotBy(fn, obj, 'val', 1);
  *
  * @name decreasesButNotBy
  * @param {Function} modifier function
  * @param {Object} object or getter function
  * @param {String} property name _optional_
  * @param {Number} change amount (delta)
  * @param {String} message _optional_
  * @namespace Assert
  * @api public
  */

 assert.decreasesButNotBy = function (fn, obj, prop, delta, msg) {
   if (arguments.length === 4 && typeof obj === 'function') {
     var tmpMsg = delta;
     delta = prop;
     msg = tmpMsg;
   } else if (arguments.length === 3) {
     delta = prop;
     prop = null;
   }

   new Assertion(fn, msg, assert.decreasesButNotBy, true)
     .to.decrease(obj, prop).but.not.by(delta);
 }

 /*!
  * ### .ifError(object)
  *
  * Asserts if value is not a false value, and throws if it is a true value.
  * This is added to allow for chai to be a drop-in replacement for Node's
  * assert class.
  *
  *     var err = new Error('I am a custom error');
  *     assert.ifError(err); // Rethrows err!
  *
  * @name ifError
  * @param {Object} object
  * @namespace Assert
  * @api public
  */

 assert.ifError = function (val) {
   if (val) {
     throw(val);
   }
 };

 /**
  * ### .isExtensible(object)
  *
  * Asserts that `object` is extensible (can have new properties added to it).
  *
  *     assert.isExtensible({});
  *
  * @name isExtensible
  * @alias extensible
  * @param {Object} object
  * @param {String} message _optional_
  * @namespace Assert
  * @api public
  */

 assert.isExtensible = function (obj, msg) {
   new Assertion(obj, msg, assert.isExtensible, true).to.be.extensible;
 };

 /**
  * ### .isNotExtensible(object)
  *
  * Asserts that `object` is _not_ extensible.
  *
  *     var nonExtensibleObject = Object.preventExtensions({});
  *     var sealedObject = Object.seal({});
  *     var frozenObject = Object.freeze({});
  *
  *     assert.isNotExtensible(nonExtensibleObject);
  *     assert.isNotExtensible(sealedObject);
  *     assert.isNotExtensible(frozenObject);
  *
  * @name isNotExtensible
  * @alias notExtensible
  * @param {Object} object
  * @param {String} message _optional_
  * @namespace Assert
  * @api public
  */

 assert.isNotExtensible = function (obj, msg) {
   new Assertion(obj, msg, assert.isNotExtensible, true).to.not.be.extensible;
 };

 /**
  * ### .isSealed(object)
  *
  * Asserts that `object` is sealed (cannot have new properties added to it
  * and its existing properties cannot be removed).
  *
  *     var sealedObject = Object.seal({});
  *     var frozenObject = Object.seal({});
  *
  *     assert.isSealed(sealedObject);
  *     assert.isSealed(frozenObject);
  *
  * @name isSealed
  * @alias sealed
  * @param {Object} object
  * @param {String} message _optional_
  * @namespace Assert
  * @api public
  */

 assert.isSealed = function (obj, msg) {
   new Assertion(obj, msg, assert.isSealed, true).to.be.sealed;
 };

 /**
  * ### .isNotSealed(object)
  *
  * Asserts that `object` is _not_ sealed.
  *
  *     assert.isNotSealed({});
  *
  * @name isNotSealed
  * @alias notSealed
  * @param {Object} object
  * @param {String} message _optional_
  * @namespace Assert
  * @api public
  */

 assert.isNotSealed = function (obj, msg) {
   new Assertion(obj, msg, assert.isNotSealed, true).to.not.be.sealed;
 };

 /**
  * ### .isFrozen(object)
  *
  * Asserts that `object` is frozen (cannot have new properties added to it
  * and its existing properties cannot be modified).
  *
  *     var frozenObject = Object.freeze({});
  *     assert.frozen(frozenObject);
  *
  * @name isFrozen
  * @alias frozen
  * @param {Object} object
  * @param {String} message _optional_
  * @namespace Assert
  * @api public
  */

 assert.isFrozen = function (obj, msg) {
   new Assertion(obj, msg, assert.isFrozen, true).to.be.frozen;
 };

 /**
  * ### .isNotFrozen(object)
  *
  * Asserts that `object` is _not_ frozen.
  *
  *     assert.isNotFrozen({});
  *
  * @name isNotFrozen
  * @alias notFrozen
  * @param {Object} object
  * @param {String} message _optional_
  * @namespace Assert
  * @api public
  */

 assert.isNotFrozen = function (obj, msg) {
   new Assertion(obj, msg, assert.isNotFrozen, true).to.not.be.frozen;
 };

 /**
  * ### .isEmpty(target)
  *
  * Asserts that the target does not contain any values.
  * For arrays and strings, it checks the `length` property.
  * For `Map` and `Set` instances, it checks the `size` property.
  * For non-function objects, it gets the count of own
  * enumerable string keys.
  *
  *     assert.isEmpty([]);
  *     assert.isEmpty('');
  *     assert.isEmpty(new Map);
  *     assert.isEmpty({});
  *
  * @name isEmpty
  * @alias empty
  * @param {Object|Array|String|Map|Set} target
  * @param {String} message _optional_
  * @namespace Assert
  * @api public
  */

 assert.isEmpty = function(val, msg) {
   new Assertion(val, msg, assert.isEmpty, true).to.be.empty;
 };

 /**
  * ### .isNotEmpty(target)
  *
  * Asserts that the target contains values.
  * For arrays and strings, it checks the `length` property.
  * For `Map` and `Set` instances, it checks the `size` property.
  * For non-function objects, it gets the count of own
  * enumerable string keys.
  *
  *     assert.isNotEmpty([1, 2]);
  *     assert.isNotEmpty('34');
  *     assert.isNotEmpty(new Set([5, 6]));
  *     assert.isNotEmpty({ key: 7 });
  *
  * @name isNotEmpty
  * @alias notEmpty
  * @param {Object|Array|String|Map|Set} target
  * @param {String} message _optional_
  * @namespace Assert
  * @api public
  */

 assert.isNotEmpty = function(val, msg) {
   new Assertion(val, msg, assert.isNotEmpty, true).to.not.be.empty;
 };

 /*!
  * Aliases.
  */

 (function alias(name, as){
   assert[as] = assert[name];
   return alias;
 })
 ('isOk', 'ok')
 ('isNotOk', 'notOk')
 ('throws', 'throw')
 ('throws', 'Throw')
 ('isExtensible', 'extensible')
 ('isNotExtensible', 'notExtensible')
 ('isSealed', 'sealed')
 ('isNotSealed', 'notSealed')
 ('isFrozen', 'frozen')
 ('isNotFrozen', 'notFrozen')
 ('isEmpty', 'empty')
 ('isNotEmpty', 'notEmpty');

};