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From gar...@apache.org
Subject [6/8] Fauxton: Add testing framework
Date Thu, 01 Aug 2013 19:59:20 GMT
http://git-wip-us.apache.org/repos/asf/couchdb/blob/9e5eb17d/src/fauxton/test/mocha/chai.js
----------------------------------------------------------------------
diff --git a/src/fauxton/test/mocha/chai.js b/src/fauxton/test/mocha/chai.js
new file mode 100644
index 0000000..2a67f98
--- /dev/null
+++ b/src/fauxton/test/mocha/chai.js
@@ -0,0 +1,4330 @@
+;(function(){
+
+/**
+ * Require the given path.
+ *
+ * @param {String} path
+ * @return {Object} exports
+ * @api public
+ */
+
+function require(path, parent, orig) {
+  var resolved = require.resolve(path);
+
+  // lookup failed
+  if (null == resolved) {
+    orig = orig || path;
+    parent = parent || 'root';
+    var err = new Error('Failed to require "' + orig + '" from "' + parent + '"');
+    err.path = orig;
+    err.parent = parent;
+    err.require = true;
+    throw err;
+  }
+
+  var module = require.modules[resolved];
+
+  // perform real require()
+  // by invoking the module's
+  // registered function
+  if (!module.exports) {
+    module.exports = {};
+    module.client = module.component = true;
+    module.call(this, module.exports, require.relative(resolved), module);
+  }
+
+  return module.exports;
+}
+
+/**
+ * Registered modules.
+ */
+
+require.modules = {};
+
+/**
+ * Registered aliases.
+ */
+
+require.aliases = {};
+
+/**
+ * Resolve `path`.
+ *
+ * Lookup:
+ *
+ *   - PATH/index.js
+ *   - PATH.js
+ *   - PATH
+ *
+ * @param {String} path
+ * @return {String} path or null
+ * @api private
+ */
+
+require.resolve = function(path) {
+  if (path.charAt(0) === '/') path = path.slice(1);
+
+  var paths = [
+    path,
+    path + '.js',
+    path + '.json',
+    path + '/index.js',
+    path + '/index.json'
+  ];
+
+  for (var i = 0; i < paths.length; i++) {
+    var path = paths[i];
+    if (require.modules.hasOwnProperty(path)) return path;
+    if (require.aliases.hasOwnProperty(path)) return require.aliases[path];
+  }
+};
+
+/**
+ * Normalize `path` relative to the current path.
+ *
+ * @param {String} curr
+ * @param {String} path
+ * @return {String}
+ * @api private
+ */
+
+require.normalize = function(curr, path) {
+  var segs = [];
+
+  if ('.' != path.charAt(0)) return path;
+
+  curr = curr.split('/');
+  path = path.split('/');
+
+  for (var i = 0; i < path.length; ++i) {
+    if ('..' == path[i]) {
+      curr.pop();
+    } else if ('.' != path[i] && '' != path[i]) {
+      segs.push(path[i]);
+    }
+  }
+
+  return curr.concat(segs).join('/');
+};
+
+/**
+ * Register module at `path` with callback `definition`.
+ *
+ * @param {String} path
+ * @param {Function} definition
+ * @api private
+ */
+
+require.register = function(path, definition) {
+  require.modules[path] = definition;
+};
+
+/**
+ * Alias a module definition.
+ *
+ * @param {String} from
+ * @param {String} to
+ * @api private
+ */
+
+require.alias = function(from, to) {
+  if (!require.modules.hasOwnProperty(from)) {
+    throw new Error('Failed to alias "' + from + '", it does not exist');
+  }
+  require.aliases[to] = from;
+};
+
+/**
+ * Return a require function relative to the `parent` path.
+ *
+ * @param {String} parent
+ * @return {Function}
+ * @api private
+ */
+
+require.relative = function(parent) {
+  var p = require.normalize(parent, '..');
+
+  /**
+   * lastIndexOf helper.
+   */
+
+  function lastIndexOf(arr, obj) {
+    var i = arr.length;
+    while (i--) {
+      if (arr[i] === obj) return i;
+    }
+    return -1;
+  }
+
+  /**
+   * The relative require() itself.
+   */
+
+  function localRequire(path) {
+    var resolved = localRequire.resolve(path);
+    return require(resolved, parent, path);
+  }
+
+  /**
+   * Resolve relative to the parent.
+   */
+
+  localRequire.resolve = function(path) {
+    var c = path.charAt(0);
+    if ('/' == c) return path.slice(1);
+    if ('.' == c) return require.normalize(p, path);
+
+    // resolve deps by returning
+    // the dep in the nearest "deps"
+    // directory
+    var segs = parent.split('/');
+    var i = lastIndexOf(segs, 'deps') + 1;
+    if (!i) i = 0;
+    path = segs.slice(0, i + 1).join('/') + '/deps/' + path;
+    return path;
+  };
+
+  /**
+   * Check if module is defined at `path`.
+   */
+
+  localRequire.exists = function(path) {
+    return require.modules.hasOwnProperty(localRequire.resolve(path));
+  };
+
+  return localRequire;
+};
+require.register("chaijs-assertion-error/index.js", function(exports, require, module){
+/*!
+ * assertion-error
+ * Copyright(c) 2013 Jake Luer <jake@qualiancy.com>
+ * MIT Licensed
+ */
+
+/*!
+ * Return a function that will copy properties from
+ * one object to another excluding any originally
+ * listed. Returned function will create a new `{}`.
+ *
+ * @param {String} excluded properties ...
+ * @return {Function}
+ */
+
+function exclude () {
+  var excludes = [].slice.call(arguments);
+
+  function excludeProps (res, obj) {
+    Object.keys(obj).forEach(function (key) {
+      if (!~excludes.indexOf(key)) res[key] = obj[key];
+    });
+  }
+
+  return function extendExclude () {
+    var args = [].slice.call(arguments)
+      , i = 0
+      , res = {};
+
+    for (; i < args.length; i++) {
+      excludeProps(res, args[i]);
+    }
+
+    return res;
+  };
+};
+
+/*!
+ * Primary Exports
+ */
+
+module.exports = AssertionError;
+
+/**
+ * ### AssertionError
+ *
+ * An extension of the JavaScript `Error` constructor for
+ * assertion and validation scenarios.
+ *
+ * @param {String} message
+ * @param {Object} properties to include (optional)
+ * @param {callee} start stack function (optional)
+ */
+
+function AssertionError (message, _props, ssf) {
+  var extend = exclude('name', 'message', 'stack', 'constructor', 'toJSON')
+    , props = extend(_props || {});
+
+  // default values
+  this.message = message || 'Unspecified AssertionError';
+  this.showDiff = false;
+
+  // copy from properties
+  for (var key in props) {
+    this[key] = props[key];
+  }
+
+  // capture stack trace
+  ssf = ssf || arguments.callee;
+  if (ssf && Error.captureStackTrace) {
+    Error.captureStackTrace(this, ssf);
+  }
+}
+
+/*!
+ * Inherit from Error.prototype
+ */
+
+AssertionError.prototype = Object.create(Error.prototype);
+
+/*!
+ * Statically set name
+ */
+
+AssertionError.prototype.name = 'AssertionError';
+
+/*!
+ * Ensure correct constructor
+ */
+
+AssertionError.prototype.constructor = AssertionError;
+
+/**
+ * Allow errors to be converted to JSON for static transfer.
+ *
+ * @param {Boolean} include stack (default: `true`)
+ * @return {Object} object that can be `JSON.stringify`
+ */
+
+AssertionError.prototype.toJSON = function (stack) {
+  var extend = exclude('constructor', 'toJSON', 'stack')
+    , props = extend({ name: this.name }, this);
+
+  // include stack if exists and not turned off
+  if (false !== stack && this.stack) {
+    props.stack = this.stack;
+  }
+
+  return props;
+};
+
+});
+require.register("chai/index.js", function(exports, require, module){
+module.exports = require('./lib/chai');
+
+});
+require.register("chai/lib/chai.js", function(exports, require, module){
+/*!
+ * chai
+ * Copyright(c) 2011-2013 Jake Luer <jake@alogicalparadox.com>
+ * MIT Licensed
+ */
+
+var used = []
+  , exports = module.exports = {};
+
+/*!
+ * Chai version
+ */
+
+exports.version = '1.7.2';
+
+/*!
+ * Assertion Error
+ */
+
+exports.AssertionError = require('assertion-error');
+
+/*!
+ * Utils for plugins (not exported)
+ */
+
+var util = require('./chai/utils');
+
+/**
+ * # .use(function)
+ *
+ * Provides a way to extend the internals of Chai
+ *
+ * @param {Function}
+ * @returns {this} for chaining
+ * @api public
+ */
+
+exports.use = function (fn) {
+  if (!~used.indexOf(fn)) {
+    fn(this, util);
+    used.push(fn);
+  }
+
+  return this;
+};
+
+/*!
+ * Primary `Assertion` prototype
+ */
+
+var assertion = require('./chai/assertion');
+exports.use(assertion);
+
+/*!
+ * Core Assertions
+ */
+
+var core = require('./chai/core/assertions');
+exports.use(core);
+
+/*!
+ * Expect interface
+ */
+
+var expect = require('./chai/interface/expect');
+exports.use(expect);
+
+/*!
+ * Should interface
+ */
+
+var should = require('./chai/interface/should');
+exports.use(should);
+
+/*!
+ * Assert interface
+ */
+
+var assert = require('./chai/interface/assert');
+exports.use(assert);
+
+});
+require.register("chai/lib/chai/assertion.js", function(exports, require, module){
+/*!
+ * chai
+ * http://chaijs.com
+ * Copyright(c) 2011-2013 Jake Luer <jake@alogicalparadox.com>
+ * MIT Licensed
+ */
+
+module.exports = function (_chai, util) {
+  /*!
+   * Module dependencies.
+   */
+
+  var AssertionError = _chai.AssertionError
+    , flag = util.flag;
+
+  /*!
+   * Module export.
+   */
+
+  _chai.Assertion = Assertion;
+
+  /*!
+   * Assertion Constructor
+   *
+   * Creates object for chaining.
+   *
+   * @api private
+   */
+
+  function Assertion (obj, msg, stack) {
+    flag(this, 'ssfi', stack || arguments.callee);
+    flag(this, 'object', obj);
+    flag(this, 'message', msg);
+  }
+
+  /*!
+    * ### Assertion.includeStack
+    *
+    * User configurable property, influences whether stack trace
+    * is included in Assertion error message. Default of false
+    * suppresses stack trace in the error message
+    *
+    *     Assertion.includeStack = true;  // enable stack on error
+    *
+    * @api public
+    */
+
+  Assertion.includeStack = false;
+
+  /*!
+   * ### Assertion.showDiff
+   *
+   * User configurable property, influences whether or not
+   * the `showDiff` flag should be included in the thrown
+   * AssertionErrors. `false` will always be `false`; `true`
+   * will be true when the assertion has requested a diff
+   * be shown.
+   *
+   * @api public
+   */
+
+  Assertion.showDiff = true;
+
+  Assertion.addProperty = function (name, fn) {
+    util.addProperty(this.prototype, name, fn);
+  };
+
+  Assertion.addMethod = function (name, fn) {
+    util.addMethod(this.prototype, name, fn);
+  };
+
+  Assertion.addChainableMethod = function (name, fn, chainingBehavior) {
+    util.addChainableMethod(this.prototype, name, fn, chainingBehavior);
+  };
+
+  Assertion.overwriteProperty = function (name, fn) {
+    util.overwriteProperty(this.prototype, name, fn);
+  };
+
+  Assertion.overwriteMethod = function (name, fn) {
+    util.overwriteMethod(this.prototype, name, fn);
+  };
+
+  /*!
+   * ### .assert(expression, message, negateMessage, expected, actual)
+   *
+   * Executes an expression and check expectations. Throws AssertionError for reporting if test doesn't pass.
+   *
+   * @name assert
+   * @param {Philosophical} expression to be tested
+   * @param {String} message to display if fails
+   * @param {String} negatedMessage to display if negated expression fails
+   * @param {Mixed} expected value (remember to check for negation)
+   * @param {Mixed} actual (optional) will default to `this.obj`
+   * @api private
+   */
+
+  Assertion.prototype.assert = function (expr, msg, negateMsg, expected, _actual, showDiff) {
+    var ok = util.test(this, arguments);
+    if (true !== showDiff) showDiff = false;
+    if (true !== Assertion.showDiff) showDiff = false;
+
+    if (!ok) {
+      var msg = util.getMessage(this, arguments)
+        , actual = util.getActual(this, arguments);
+      throw new AssertionError(msg, {
+          actual: actual
+        , expected: expected
+        , showDiff: showDiff
+      }, (Assertion.includeStack) ? this.assert : flag(this, 'ssfi'));
+    }
+  };
+
+  /*!
+   * ### ._obj
+   *
+   * Quick reference to stored `actual` value for plugin developers.
+   *
+   * @api private
+   */
+
+  Object.defineProperty(Assertion.prototype, '_obj',
+    { get: function () {
+        return flag(this, 'object');
+      }
+    , set: function (val) {
+        flag(this, 'object', val);
+      }
+  });
+};
+
+});
+require.register("chai/lib/chai/core/assertions.js", function(exports, require, module){
+/*!
+ * chai
+ * http://chaijs.com
+ * Copyright(c) 2011-2013 Jake Luer <jake@alogicalparadox.com>
+ * MIT Licensed
+ */
+
+module.exports = function (chai, _) {
+  var Assertion = chai.Assertion
+    , toString = Object.prototype.toString
+    , flag = _.flag;
+
+  /**
+   * ### Language Chains
+   *
+   * The following are provide as chainable getters to
+   * improve the readability of your assertions. They
+   * do not provide an testing capability unless they
+   * have been overwritten by a plugin.
+   *
+   * **Chains**
+   *
+   * - to
+   * - be
+   * - been
+   * - is
+   * - that
+   * - and
+   * - have
+   * - with
+   * - at
+   * - of
+   * - same
+   *
+   * @name language chains
+   * @api public
+   */
+
+  [ 'to', 'be', 'been'
+  , 'is', 'and', 'have'
+  , 'with', 'that', 'at'
+  , 'of', 'same' ].forEach(function (chain) {
+    Assertion.addProperty(chain, function () {
+      return this;
+    });
+  });
+
+  /**
+   * ### .not
+   *
+   * Negates any of assertions following in the chain.
+   *
+   *     expect(foo).to.not.equal('bar');
+   *     expect(goodFn).to.not.throw(Error);
+   *     expect({ foo: 'baz' }).to.have.property('foo')
+   *       .and.not.equal('bar');
+   *
+   * @name not
+   * @api public
+   */
+
+  Assertion.addProperty('not', function () {
+    flag(this, 'negate', true);
+  });
+
+  /**
+   * ### .deep
+   *
+   * Sets the `deep` flag, later used by the `equal` and
+   * `property` assertions.
+   *
+   *     expect(foo).to.deep.equal({ bar: 'baz' });
+   *     expect({ foo: { bar: { baz: 'quux' } } })
+   *       .to.have.deep.property('foo.bar.baz', 'quux');
+   *
+   * @name deep
+   * @api public
+   */
+
+  Assertion.addProperty('deep', function () {
+    flag(this, 'deep', true);
+  });
+
+  /**
+   * ### .a(type)
+   *
+   * The `a` and `an` assertions are aliases that can be
+   * used either as language chains or to assert a value's
+   * type.
+   *
+   *     // typeof
+   *     expect('test').to.be.a('string');
+   *     expect({ foo: 'bar' }).to.be.an('object');
+   *     expect(null).to.be.a('null');
+   *     expect(undefined).to.be.an('undefined');
+   *
+   *     // language chain
+   *     expect(foo).to.be.an.instanceof(Foo);
+   *
+   * @name a
+   * @alias an
+   * @param {String} type
+   * @param {String} message _optional_
+   * @api public
+   */
+
+  function an (type, msg) {
+    if (msg) flag(this, 'message', msg);
+    type = type.toLowerCase();
+    var obj = flag(this, 'object')
+      , article = ~[ 'a', 'e', 'i', 'o', 'u' ].indexOf(type.charAt(0)) ? 'an ' : 'a ';
+
+    this.assert(
+        type === _.type(obj)
+      , 'expected #{this} to be ' + article + type
+      , 'expected #{this} not to be ' + article + type
+    );
+  }
+
+  Assertion.addChainableMethod('an', an);
+  Assertion.addChainableMethod('a', an);
+
+  /**
+   * ### .include(value)
+   *
+   * The `include` and `contain` assertions can be used as either property
+   * based language chains or as methods to assert the inclusion of an object
+   * in an array or a substring in a string. When used as language chains,
+   * they toggle the `contain` flag for the `keys` assertion.
+   *
+   *     expect([1,2,3]).to.include(2);
+   *     expect('foobar').to.contain('foo');
+   *     expect({ foo: 'bar', hello: 'universe' }).to.include.keys('foo');
+   *
+   * @name include
+   * @alias contain
+   * @param {Object|String|Number} obj
+   * @param {String} message _optional_
+   * @api public
+   */
+
+  function includeChainingBehavior () {
+    flag(this, 'contains', true);
+  }
+
+  function include (val, msg) {
+    if (msg) flag(this, 'message', msg);
+    var obj = flag(this, 'object')
+    this.assert(
+        ~obj.indexOf(val)
+      , 'expected #{this} to include ' + _.inspect(val)
+      , 'expected #{this} to not include ' + _.inspect(val));
+  }
+
+  Assertion.addChainableMethod('include', include, includeChainingBehavior);
+  Assertion.addChainableMethod('contain', include, includeChainingBehavior);
+
+  /**
+   * ### .ok
+   *
+   * Asserts that the target is truthy.
+   *
+   *     expect('everthing').to.be.ok;
+   *     expect(1).to.be.ok;
+   *     expect(false).to.not.be.ok;
+   *     expect(undefined).to.not.be.ok;
+   *     expect(null).to.not.be.ok;
+   *
+   * @name ok
+   * @api public
+   */
+
+  Assertion.addProperty('ok', function () {
+    this.assert(
+        flag(this, 'object')
+      , 'expected #{this} to be truthy'
+      , 'expected #{this} to be falsy');
+  });
+
+  /**
+   * ### .true
+   *
+   * Asserts that the target is `true`.
+   *
+   *     expect(true).to.be.true;
+   *     expect(1).to.not.be.true;
+   *
+   * @name true
+   * @api public
+   */
+
+  Assertion.addProperty('true', function () {
+    this.assert(
+        true === flag(this, 'object')
+      , 'expected #{this} to be true'
+      , 'expected #{this} to be false'
+      , this.negate ? false : true
+    );
+  });
+
+  /**
+   * ### .false
+   *
+   * Asserts that the target is `false`.
+   *
+   *     expect(false).to.be.false;
+   *     expect(0).to.not.be.false;
+   *
+   * @name false
+   * @api public
+   */
+
+  Assertion.addProperty('false', function () {
+    this.assert(
+        false === flag(this, 'object')
+      , 'expected #{this} to be false'
+      , 'expected #{this} to be true'
+      , this.negate ? true : false
+    );
+  });
+
+  /**
+   * ### .null
+   *
+   * Asserts that the target is `null`.
+   *
+   *     expect(null).to.be.null;
+   *     expect(undefined).not.to.be.null;
+   *
+   * @name null
+   * @api public
+   */
+
+  Assertion.addProperty('null', function () {
+    this.assert(
+        null === flag(this, 'object')
+      , 'expected #{this} to be null'
+      , 'expected #{this} not to be null'
+    );
+  });
+
+  /**
+   * ### .undefined
+   *
+   * Asserts that the target is `undefined`.
+   *
+   *      expect(undefined).to.be.undefined;
+   *      expect(null).to.not.be.undefined;
+   *
+   * @name undefined
+   * @api public
+   */
+
+  Assertion.addProperty('undefined', function () {
+    this.assert(
+        undefined === flag(this, 'object')
+      , 'expected #{this} to be undefined'
+      , 'expected #{this} not to be undefined'
+    );
+  });
+
+  /**
+   * ### .exist
+   *
+   * Asserts that the target is neither `null` nor `undefined`.
+   *
+   *     var foo = 'hi'
+   *       , bar = null
+   *       , baz;
+   *
+   *     expect(foo).to.exist;
+   *     expect(bar).to.not.exist;
+   *     expect(baz).to.not.exist;
+   *
+   * @name exist
+   * @api public
+   */
+
+  Assertion.addProperty('exist', function () {
+    this.assert(
+        null != flag(this, 'object')
+      , 'expected #{this} to exist'
+      , 'expected #{this} to not exist'
+    );
+  });
+
+
+  /**
+   * ### .empty
+   *
+   * Asserts that the target's length is `0`. For arrays, it checks
+   * the `length` property. For objects, it gets the count of
+   * enumerable keys.
+   *
+   *     expect([]).to.be.empty;
+   *     expect('').to.be.empty;
+   *     expect({}).to.be.empty;
+   *
+   * @name empty
+   * @api public
+   */
+
+  Assertion.addProperty('empty', function () {
+    var obj = flag(this, 'object')
+      , expected = obj;
+
+    if (Array.isArray(obj) || 'string' === typeof object) {
+      expected = obj.length;
+    } else if (typeof obj === 'object') {
+      expected = Object.keys(obj).length;
+    }
+
+    this.assert(
+        !expected
+      , 'expected #{this} to be empty'
+      , 'expected #{this} not to be empty'
+    );
+  });
+
+  /**
+   * ### .arguments
+   *
+   * Asserts that the target is an arguments object.
+   *
+   *     function test () {
+   *       expect(arguments).to.be.arguments;
+   *     }
+   *
+   * @name arguments
+   * @alias Arguments
+   * @api public
+   */
+
+  function checkArguments () {
+    var obj = flag(this, 'object')
+      , type = Object.prototype.toString.call(obj);
+    this.assert(
+        '[object Arguments]' === type
+      , 'expected #{this} to be arguments but got ' + type
+      , 'expected #{this} to not be arguments'
+    );
+  }
+
+  Assertion.addProperty('arguments', checkArguments);
+  Assertion.addProperty('Arguments', checkArguments);
+
+  /**
+   * ### .equal(value)
+   *
+   * Asserts that the target is strictly equal (`===`) to `value`.
+   * Alternately, if the `deep` flag is set, asserts that
+   * the target is deeply equal to `value`.
+   *
+   *     expect('hello').to.equal('hello');
+   *     expect(42).to.equal(42);
+   *     expect(1).to.not.equal(true);
+   *     expect({ foo: 'bar' }).to.not.equal({ foo: 'bar' });
+   *     expect({ foo: 'bar' }).to.deep.equal({ foo: 'bar' });
+   *
+   * @name equal
+   * @alias equals
+   * @alias eq
+   * @alias deep.equal
+   * @param {Mixed} value
+   * @param {String} message _optional_
+   * @api public
+   */
+
+  function assertEqual (val, msg) {
+    if (msg) flag(this, 'message', msg);
+    var obj = flag(this, 'object');
+    if (flag(this, 'deep')) {
+      return this.eql(val);
+    } else {
+      this.assert(
+          val === obj
+        , 'expected #{this} to equal #{exp}'
+        , 'expected #{this} to not equal #{exp}'
+        , val
+        , this._obj
+        , true
+      );
+    }
+  }
+
+  Assertion.addMethod('equal', assertEqual);
+  Assertion.addMethod('equals', assertEqual);
+  Assertion.addMethod('eq', assertEqual);
+
+  /**
+   * ### .eql(value)
+   *
+   * Asserts that the target is deeply equal to `value`.
+   *
+   *     expect({ foo: 'bar' }).to.eql({ foo: 'bar' });
+   *     expect([ 1, 2, 3 ]).to.eql([ 1, 2, 3 ]);
+   *
+   * @name eql
+   * @alias eqls
+   * @param {Mixed} value
+   * @param {String} message _optional_
+   * @api public
+   */
+
+  function assertEql(obj, msg) {
+    if (msg) flag(this, 'message', msg);
+    this.assert(
+        _.eql(obj, flag(this, 'object'))
+      , 'expected #{this} to deeply equal #{exp}'
+      , 'expected #{this} to not deeply equal #{exp}'
+      , obj
+      , this._obj
+      , true
+    );
+  }
+
+  Assertion.addMethod('eql', assertEql);
+  Assertion.addMethod('eqls', assertEql);
+
+  /**
+   * ### .above(value)
+   *
+   * Asserts that the target is greater than `value`.
+   *
+   *     expect(10).to.be.above(5);
+   *
+   * Can also be used in conjunction with `length` to
+   * assert a minimum length. The benefit being a
+   * more informative error message than if the length
+   * was supplied directly.
+   *
+   *     expect('foo').to.have.length.above(2);
+   *     expect([ 1, 2, 3 ]).to.have.length.above(2);
+   *
+   * @name above
+   * @alias gt
+   * @alias greaterThan
+   * @param {Number} value
+   * @param {String} message _optional_
+   * @api public
+   */
+
+  function assertAbove (n, msg) {
+    if (msg) flag(this, 'message', msg);
+    var obj = flag(this, 'object');
+    if (flag(this, 'doLength')) {
+      new Assertion(obj, msg).to.have.property('length');
+      var len = obj.length;
+      this.assert(
+          len > n
+        , 'expected #{this} to have a length above #{exp} but got #{act}'
+        , 'expected #{this} to not have a length above #{exp}'
+        , n
+        , len
+      );
+    } else {
+      this.assert(
+          obj > n
+        , 'expected #{this} to be above ' + n
+        , 'expected #{this} to be at most ' + n
+      );
+    }
+  }
+
+  Assertion.addMethod('above', assertAbove);
+  Assertion.addMethod('gt', assertAbove);
+  Assertion.addMethod('greaterThan', assertAbove);
+
+  /**
+   * ### .least(value)
+   *
+   * Asserts that the target is greater than or equal to `value`.
+   *
+   *     expect(10).to.be.at.least(10);
+   *
+   * Can also be used in conjunction with `length` to
+   * assert a minimum length. The benefit being a
+   * more informative error message than if the length
+   * was supplied directly.
+   *
+   *     expect('foo').to.have.length.of.at.least(2);
+   *     expect([ 1, 2, 3 ]).to.have.length.of.at.least(3);
+   *
+   * @name least
+   * @alias gte
+   * @param {Number} value
+   * @param {String} message _optional_
+   * @api public
+   */
+
+  function assertLeast (n, msg) {
+    if (msg) flag(this, 'message', msg);
+    var obj = flag(this, 'object');
+    if (flag(this, 'doLength')) {
+      new Assertion(obj, msg).to.have.property('length');
+      var len = obj.length;
+      this.assert(
+          len >= n
+        , 'expected #{this} to have a length at least #{exp} but got #{act}'
+        , 'expected #{this} to have a length below #{exp}'
+        , n
+        , len
+      );
+    } else {
+      this.assert(
+          obj >= n
+        , 'expected #{this} to be at least ' + n
+        , 'expected #{this} to be below ' + n
+      );
+    }
+  }
+
+  Assertion.addMethod('least', assertLeast);
+  Assertion.addMethod('gte', assertLeast);
+
+  /**
+   * ### .below(value)
+   *
+   * Asserts that the target is less than `value`.
+   *
+   *     expect(5).to.be.below(10);
+   *
+   * Can also be used in conjunction with `length` to
+   * assert a maximum length. The benefit being a
+   * more informative error message than if the length
+   * was supplied directly.
+   *
+   *     expect('foo').to.have.length.below(4);
+   *     expect([ 1, 2, 3 ]).to.have.length.below(4);
+   *
+   * @name below
+   * @alias lt
+   * @alias lessThan
+   * @param {Number} value
+   * @param {String} message _optional_
+   * @api public
+   */
+
+  function assertBelow (n, msg) {
+    if (msg) flag(this, 'message', msg);
+    var obj = flag(this, 'object');
+    if (flag(this, 'doLength')) {
+      new Assertion(obj, msg).to.have.property('length');
+      var len = obj.length;
+      this.assert(
+          len < n
+        , 'expected #{this} to have a length below #{exp} but got #{act}'
+        , 'expected #{this} to not have a length below #{exp}'
+        , n
+        , len
+      );
+    } else {
+      this.assert(
+          obj < n
+        , 'expected #{this} to be below ' + n
+        , 'expected #{this} to be at least ' + n
+      );
+    }
+  }
+
+  Assertion.addMethod('below', assertBelow);
+  Assertion.addMethod('lt', assertBelow);
+  Assertion.addMethod('lessThan', assertBelow);
+
+  /**
+   * ### .most(value)
+   *
+   * Asserts that the target is less than or equal to `value`.
+   *
+   *     expect(5).to.be.at.most(5);
+   *
+   * Can also be used in conjunction with `length` to
+   * assert a maximum length. The benefit being a
+   * more informative error message than if the length
+   * was supplied directly.
+   *
+   *     expect('foo').to.have.length.of.at.most(4);
+   *     expect([ 1, 2, 3 ]).to.have.length.of.at.most(3);
+   *
+   * @name most
+   * @alias lte
+   * @param {Number} value
+   * @param {String} message _optional_
+   * @api public
+   */
+
+  function assertMost (n, msg) {
+    if (msg) flag(this, 'message', msg);
+    var obj = flag(this, 'object');
+    if (flag(this, 'doLength')) {
+      new Assertion(obj, msg).to.have.property('length');
+      var len = obj.length;
+      this.assert(
+          len <= n
+        , 'expected #{this} to have a length at most #{exp} but got #{act}'
+        , 'expected #{this} to have a length above #{exp}'
+        , n
+        , len
+      );
+    } else {
+      this.assert(
+          obj <= n
+        , 'expected #{this} to be at most ' + n
+        , 'expected #{this} to be above ' + n
+      );
+    }
+  }
+
+  Assertion.addMethod('most', assertMost);
+  Assertion.addMethod('lte', assertMost);
+
+  /**
+   * ### .within(start, finish)
+   *
+   * Asserts that the target is within a range.
+   *
+   *     expect(7).to.be.within(5,10);
+   *
+   * Can also be used in conjunction with `length` to
+   * assert a length range. The benefit being a
+   * more informative error message than if the length
+   * was supplied directly.
+   *
+   *     expect('foo').to.have.length.within(2,4);
+   *     expect([ 1, 2, 3 ]).to.have.length.within(2,4);
+   *
+   * @name within
+   * @param {Number} start lowerbound inclusive
+   * @param {Number} finish upperbound inclusive
+   * @param {String} message _optional_
+   * @api public
+   */
+
+  Assertion.addMethod('within', function (start, finish, msg) {
+    if (msg) flag(this, 'message', msg);
+    var obj = flag(this, 'object')
+      , range = start + '..' + finish;
+    if (flag(this, 'doLength')) {
+      new Assertion(obj, msg).to.have.property('length');
+      var len = obj.length;
+      this.assert(
+          len >= start && len <= finish
+        , 'expected #{this} to have a length within ' + range
+        , 'expected #{this} to not have a length within ' + range
+      );
+    } else {
+      this.assert(
+          obj >= start && obj <= finish
+        , 'expected #{this} to be within ' + range
+        , 'expected #{this} to not be within ' + range
+      );
+    }
+  });
+
+  /**
+   * ### .instanceof(constructor)
+   *
+   * Asserts that the target is an instance of `constructor`.
+   *
+   *     var Tea = function (name) { this.name = name; }
+   *       , Chai = new Tea('chai');
+   *
+   *     expect(Chai).to.be.an.instanceof(Tea);
+   *     expect([ 1, 2, 3 ]).to.be.instanceof(Array);
+   *
+   * @name instanceof
+   * @param {Constructor} constructor
+   * @param {String} message _optional_
+   * @alias instanceOf
+   * @api public
+   */
+
+  function assertInstanceOf (constructor, msg) {
+    if (msg) flag(this, 'message', msg);
+    var name = _.getName(constructor);
+    this.assert(
+        flag(this, 'object') instanceof constructor
+      , 'expected #{this} to be an instance of ' + name
+      , 'expected #{this} to not be an instance of ' + name
+    );
+  };
+
+  Assertion.addMethod('instanceof', assertInstanceOf);
+  Assertion.addMethod('instanceOf', assertInstanceOf);
+
+  /**
+   * ### .property(name, [value])
+   *
+   * Asserts that the target has a property `name`, optionally asserting that
+   * the value of that property is strictly equal to  `value`.
+   * If the `deep` flag is set, you can use dot- and bracket-notation for deep
+   * references into objects and arrays.
+   *
+   *     // simple referencing
+   *     var obj = { foo: 'bar' };
+   *     expect(obj).to.have.property('foo');
+   *     expect(obj).to.have.property('foo', 'bar');
+   *
+   *     // deep referencing
+   *     var deepObj = {
+   *         green: { tea: 'matcha' }
+   *       , teas: [ 'chai', 'matcha', { tea: 'konacha' } ]
+   *     };
+
+   *     expect(deepObj).to.have.deep.property('green.tea', 'matcha');
+   *     expect(deepObj).to.have.deep.property('teas[1]', 'matcha');
+   *     expect(deepObj).to.have.deep.property('teas[2].tea', 'konacha');
+   *
+   * You can also use an array as the starting point of a `deep.property`
+   * assertion, or traverse nested arrays.
+   *
+   *     var arr = [
+   *         [ 'chai', 'matcha', 'konacha' ]
+   *       , [ { tea: 'chai' }
+   *         , { tea: 'matcha' }
+   *         , { tea: 'konacha' } ]
+   *     ];
+   *
+   *     expect(arr).to.have.deep.property('[0][1]', 'matcha');
+   *     expect(arr).to.have.deep.property('[1][2].tea', 'konacha');
+   *
+   * Furthermore, `property` changes the subject of the assertion
+   * to be the value of that property from the original object. This
+   * permits for further chainable assertions on that property.
+   *
+   *     expect(obj).to.have.property('foo')
+   *       .that.is.a('string');
+   *     expect(deepObj).to.have.property('green')
+   *       .that.is.an('object')
+   *       .that.deep.equals({ tea: 'matcha' });
+   *     expect(deepObj).to.have.property('teas')
+   *       .that.is.an('array')
+   *       .with.deep.property('[2]')
+   *         .that.deep.equals({ tea: 'konacha' });
+   *
+   * @name property
+   * @alias deep.property
+   * @param {String} name
+   * @param {Mixed} value (optional)
+   * @param {String} message _optional_
+   * @returns value of property for chaining
+   * @api public
+   */
+
+  Assertion.addMethod('property', function (name, val, msg) {
+    if (msg) flag(this, 'message', msg);
+
+    var descriptor = flag(this, 'deep') ? 'deep property ' : 'property '
+      , negate = flag(this, 'negate')
+      , obj = flag(this, 'object')
+      , value = flag(this, 'deep')
+        ? _.getPathValue(name, obj)
+        : obj[name];
+
+    if (negate && undefined !== val) {
+      if (undefined === value) {
+        msg = (msg != null) ? msg + ': ' : '';
+        throw new Error(msg + _.inspect(obj) + ' has no ' + descriptor + _.inspect(name));
+      }
+    } else {
+      this.assert(
+          undefined !== value
+        , 'expected #{this} to have a ' + descriptor + _.inspect(name)
+        , 'expected #{this} to not have ' + descriptor + _.inspect(name));
+    }
+
+    if (undefined !== val) {
+      this.assert(
+          val === value
+        , 'expected #{this} to have a ' + descriptor + _.inspect(name) + ' of #{exp}, but got #{act}'
+        , 'expected #{this} to not have a ' + descriptor + _.inspect(name) + ' of #{act}'
+        , val
+        , value
+      );
+    }
+
+    flag(this, 'object', value);
+  });
+
+
+  /**
+   * ### .ownProperty(name)
+   *
+   * Asserts that the target has an own property `name`.
+   *
+   *     expect('test').to.have.ownProperty('length');
+   *
+   * @name ownProperty
+   * @alias haveOwnProperty
+   * @param {String} name
+   * @param {String} message _optional_
+   * @api public
+   */
+
+  function assertOwnProperty (name, msg) {
+    if (msg) flag(this, 'message', msg);
+    var obj = flag(this, 'object');
+    this.assert(
+        obj.hasOwnProperty(name)
+      , 'expected #{this} to have own property ' + _.inspect(name)
+      , 'expected #{this} to not have own property ' + _.inspect(name)
+    );
+  }
+
+  Assertion.addMethod('ownProperty', assertOwnProperty);
+  Assertion.addMethod('haveOwnProperty', assertOwnProperty);
+
+  /**
+   * ### .length(value)
+   *
+   * Asserts that the target's `length` property has
+   * the expected value.
+   *
+   *     expect([ 1, 2, 3]).to.have.length(3);
+   *     expect('foobar').to.have.length(6);
+   *
+   * Can also be used as a chain precursor to a value
+   * comparison for the length property.
+   *
+   *     expect('foo').to.have.length.above(2);
+   *     expect([ 1, 2, 3 ]).to.have.length.above(2);
+   *     expect('foo').to.have.length.below(4);
+   *     expect([ 1, 2, 3 ]).to.have.length.below(4);
+   *     expect('foo').to.have.length.within(2,4);
+   *     expect([ 1, 2, 3 ]).to.have.length.within(2,4);
+   *
+   * @name length
+   * @alias lengthOf
+   * @param {Number} length
+   * @param {String} message _optional_
+   * @api public
+   */
+
+  function assertLengthChain () {
+    flag(this, 'doLength', true);
+  }
+
+  function assertLength (n, msg) {
+    if (msg) flag(this, 'message', msg);
+    var obj = flag(this, 'object');
+    new Assertion(obj, msg).to.have.property('length');
+    var len = obj.length;
+
+    this.assert(
+        len == n
+      , 'expected #{this} to have a length of #{exp} but got #{act}'
+      , 'expected #{this} to not have a length of #{act}'
+      , n
+      , len
+    );
+  }
+
+  Assertion.addChainableMethod('length', assertLength, assertLengthChain);
+  Assertion.addMethod('lengthOf', assertLength, assertLengthChain);
+
+  /**
+   * ### .match(regexp)
+   *
+   * Asserts that the target matches a regular expression.
+   *
+   *     expect('foobar').to.match(/^foo/);
+   *
+   * @name match
+   * @param {RegExp} RegularExpression
+   * @param {String} message _optional_
+   * @api public
+   */
+
+  Assertion.addMethod('match', function (re, msg) {
+    if (msg) flag(this, 'message', msg);
+    var obj = flag(this, 'object');
+    this.assert(
+        re.exec(obj)
+      , 'expected #{this} to match ' + re
+      , 'expected #{this} not to match ' + re
+    );
+  });
+
+  /**
+   * ### .string(string)
+   *
+   * Asserts that the string target contains another string.
+   *
+   *     expect('foobar').to.have.string('bar');
+   *
+   * @name string
+   * @param {String} string
+   * @param {String} message _optional_
+   * @api public
+   */
+
+  Assertion.addMethod('string', function (str, msg) {
+    if (msg) flag(this, 'message', msg);
+    var obj = flag(this, 'object');
+    new Assertion(obj, msg).is.a('string');
+
+    this.assert(
+        ~obj.indexOf(str)
+      , 'expected #{this} to contain ' + _.inspect(str)
+      , 'expected #{this} to not contain ' + _.inspect(str)
+    );
+  });
+
+
+  /**
+   * ### .keys(key1, [key2], [...])
+   *
+   * Asserts that the target has exactly the given keys, or
+   * asserts the inclusion of some keys when using the
+   * `include` or `contain` modifiers.
+   *
+   *     expect({ foo: 1, bar: 2 }).to.have.keys(['foo', 'bar']);
+   *     expect({ foo: 1, bar: 2, baz: 3 }).to.contain.keys('foo', 'bar');
+   *
+   * @name keys
+   * @alias key
+   * @param {String...|Array} keys
+   * @api public
+   */
+
+  function assertKeys (keys) {
+    var obj = flag(this, 'object')
+      , str
+      , ok = true;
+
+    keys = keys instanceof Array
+      ? keys
+      : Array.prototype.slice.call(arguments);
+
+    if (!keys.length) throw new Error('keys required');
+
+    var actual = Object.keys(obj)
+      , len = keys.length;
+
+    // Inclusion
+    ok = keys.every(function(key){
+      return ~actual.indexOf(key);
+    });
+
+    // Strict
+    if (!flag(this, 'negate') && !flag(this, 'contains')) {
+      ok = ok && keys.length == actual.length;
+    }
+
+    // Key string
+    if (len > 1) {
+      keys = keys.map(function(key){
+        return _.inspect(key);
+      });
+      var last = keys.pop();
+      str = keys.join(', ') + ', and ' + last;
+    } else {
+      str = _.inspect(keys[0]);
+    }
+
+    // Form
+    str = (len > 1 ? 'keys ' : 'key ') + str;
+
+    // Have / include
+    str = (flag(this, 'contains') ? 'contain ' : 'have ') + str;
+
+    // Assertion
+    this.assert(
+        ok
+      , 'expected #{this} to ' + str
+      , 'expected #{this} to not ' + str
+    );
+  }
+
+  Assertion.addMethod('keys', assertKeys);
+  Assertion.addMethod('key', assertKeys);
+
+  /**
+   * ### .throw(constructor)
+   *
+   * Asserts that the function target will throw a specific error, or specific type of error
+   * (as determined using `instanceof`), optionally with a RegExp or string inclusion test
+   * for the error's message.
+   *
+   *     var err = new ReferenceError('This is a bad function.');
+   *     var fn = function () { throw err; }
+   *     expect(fn).to.throw(ReferenceError);
+   *     expect(fn).to.throw(Error);
+   *     expect(fn).to.throw(/bad function/);
+   *     expect(fn).to.not.throw('good function');
+   *     expect(fn).to.throw(ReferenceError, /bad function/);
+   *     expect(fn).to.throw(err);
+   *     expect(fn).to.not.throw(new RangeError('Out of range.'));
+   *
+   * Please note that when a throw expectation is negated, it will check each
+   * parameter independently, starting with error constructor type. The appropriate way
+   * to check for the existence of a type of error but for a message that does not match
+   * is to use `and`.
+   *
+   *     expect(fn).to.throw(ReferenceError)
+   *        .and.not.throw(/good function/);
+   *
+   * @name throw
+   * @alias throws
+   * @alias Throw
+   * @param {ErrorConstructor} constructor
+   * @param {String|RegExp} expected error message
+   * @param {String} message _optional_
+   * @see https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Error#Error_types
+   * @api public
+   */
+
+  function assertThrows (constructor, errMsg, msg) {
+    if (msg) flag(this, 'message', msg);
+    var obj = flag(this, 'object');
+    new Assertion(obj, msg).is.a('function');
+
+    var thrown = false
+      , desiredError = null
+      , name = null
+      , thrownError = null;
+
+    if (arguments.length === 0) {
+      errMsg = null;
+      constructor = null;
+    } else if (constructor && (constructor instanceof RegExp || 'string' === typeof constructor)) {
+      errMsg = constructor;
+      constructor = null;
+    } else if (constructor && constructor instanceof Error) {
+      desiredError = constructor;
+      constructor = null;
+      errMsg = null;
+    } else if (typeof constructor === 'function') {
+      name = (new constructor()).name;
+    } else {
+      constructor = null;
+    }
+
+    try {
+      obj();
+    } catch (err) {
+      // first, check desired error
+      if (desiredError) {
+        this.assert(
+            err === desiredError
+          , 'expected #{this} to throw #{exp} but #{act} was thrown'
+          , 'expected #{this} to not throw #{exp}'
+          , desiredError
+          , err
+        );
+
+        return this;
+      }
+      // next, check constructor
+      if (constructor) {
+        this.assert(
+            err instanceof constructor
+          , 'expected #{this} to throw #{exp} but #{act} was thrown'
+          , 'expected #{this} to not throw #{exp} but #{act} was thrown'
+          , name
+          , err
+        );
+
+        if (!errMsg) return this;
+      }
+      // next, check message
+      var message = 'object' === _.type(err) && "message" in err
+        ? err.message
+        : '' + err;
+
+      if ((message != null) && errMsg && errMsg instanceof RegExp) {
+        this.assert(
+            errMsg.exec(message)
+          , 'expected #{this} to throw error matching #{exp} but got #{act}'
+          , 'expected #{this} to throw error not matching #{exp}'
+          , errMsg
+          , message
+        );
+
+        return this;
+      } else if ((message != null) && errMsg && 'string' === typeof errMsg) {
+        this.assert(
+            ~message.indexOf(errMsg)
+          , 'expected #{this} to throw error including #{exp} but got #{act}'
+          , 'expected #{this} to throw error not including #{act}'
+          , errMsg
+          , message
+        );
+
+        return this;
+      } else {
+        thrown = true;
+        thrownError = err;
+      }
+    }
+
+    var actuallyGot = ''
+      , expectedThrown = name !== null
+        ? name
+        : desiredError
+          ? '#{exp}' //_.inspect(desiredError)
+          : 'an error';
+
+    if (thrown) {
+      actuallyGot = ' but #{act} was thrown'
+    }
+
+    this.assert(
+        thrown === true
+      , 'expected #{this} to throw ' + expectedThrown + actuallyGot
+      , 'expected #{this} to not throw ' + expectedThrown + actuallyGot
+      , desiredError
+      , thrownError
+    );
+  };
+
+  Assertion.addMethod('throw', assertThrows);
+  Assertion.addMethod('throws', assertThrows);
+  Assertion.addMethod('Throw', assertThrows);
+
+  /**
+   * ### .respondTo(method)
+   *
+   * Asserts that the object or class target will respond to a method.
+   *
+   *     Klass.prototype.bar = function(){};
+   *     expect(Klass).to.respondTo('bar');
+   *     expect(obj).to.respondTo('bar');
+   *
+   * To check if a constructor will respond to a static function,
+   * set the `itself` flag.
+   *
+   *    Klass.baz = function(){};
+   *    expect(Klass).itself.to.respondTo('baz');
+   *
+   * @name respondTo
+   * @param {String} method
+   * @param {String} message _optional_
+   * @api public
+   */
+
+  Assertion.addMethod('respondTo', function (method, msg) {
+    if (msg) flag(this, 'message', msg);
+    var obj = flag(this, 'object')
+      , itself = flag(this, 'itself')
+      , context = ('function' === _.type(obj) && !itself)
+        ? obj.prototype[method]
+        : obj[method];
+
+    this.assert(
+        'function' === typeof context
+      , 'expected #{this} to respond to ' + _.inspect(method)
+      , 'expected #{this} to not respond to ' + _.inspect(method)
+    );
+  });
+
+  /**
+   * ### .itself
+   *
+   * Sets the `itself` flag, later used by the `respondTo` assertion.
+   *
+   *    function Foo() {}
+   *    Foo.bar = function() {}
+   *    Foo.prototype.baz = function() {}
+   *
+   *    expect(Foo).itself.to.respondTo('bar');
+   *    expect(Foo).itself.not.to.respondTo('baz');
+   *
+   * @name itself
+   * @api public
+   */
+
+  Assertion.addProperty('itself', function () {
+    flag(this, 'itself', true);
+  });
+
+  /**
+   * ### .satisfy(method)
+   *
+   * Asserts that the target passes a given truth test.
+   *
+   *     expect(1).to.satisfy(function(num) { return num > 0; });
+   *
+   * @name satisfy
+   * @param {Function} matcher
+   * @param {String} message _optional_
+   * @api public
+   */
+
+  Assertion.addMethod('satisfy', function (matcher, msg) {
+    if (msg) flag(this, 'message', msg);
+    var obj = flag(this, 'object');
+    this.assert(
+        matcher(obj)
+      , 'expected #{this} to satisfy ' + _.objDisplay(matcher)
+      , 'expected #{this} to not satisfy' + _.objDisplay(matcher)
+      , this.negate ? false : true
+      , matcher(obj)
+    );
+  });
+
+  /**
+   * ### .closeTo(expected, delta)
+   *
+   * Asserts that the target is equal `expected`, to within a +/- `delta` range.
+   *
+   *     expect(1.5).to.be.closeTo(1, 0.5);
+   *
+   * @name closeTo
+   * @param {Number} expected
+   * @param {Number} delta
+   * @param {String} message _optional_
+   * @api public
+   */
+
+  Assertion.addMethod('closeTo', function (expected, delta, msg) {
+    if (msg) flag(this, 'message', msg);
+    var obj = flag(this, 'object');
+    this.assert(
+        Math.abs(obj - expected) <= delta
+      , 'expected #{this} to be close to ' + expected + ' +/- ' + delta
+      , 'expected #{this} not to be close to ' + expected + ' +/- ' + delta
+    );
+  });
+
+  function isSubsetOf(subset, superset) {
+    return subset.every(function(elem) {
+      return superset.indexOf(elem) !== -1;
+    })
+  }
+
+  /**
+   * ### .members(set)
+   *
+   * Asserts that the target is a superset of `set`,
+   * or that the target and `set` have the same members.
+   *
+   *     expect([1, 2, 3]).to.include.members([3, 2]);
+   *     expect([1, 2, 3]).to.not.include.members([3, 2, 8]);
+   *
+   *     expect([4, 2]).to.have.members([2, 4]);
+   *     expect([5, 2]).to.not.have.members([5, 2, 1]);
+   *
+   * @name members
+   * @param {Array} set
+   * @param {String} message _optional_
+   * @api public
+   */
+
+  Assertion.addMethod('members', function (subset, msg) {
+    if (msg) flag(this, 'message', msg);
+    var obj = flag(this, 'object');
+
+    new Assertion(obj).to.be.an('array');
+    new Assertion(subset).to.be.an('array');
+
+    if (flag(this, 'contains')) {
+      return this.assert(
+          isSubsetOf(subset, obj)
+        , 'expected #{this} to be a superset of #{act}'
+        , 'expected #{this} to not be a superset of #{act}'
+        , obj
+        , subset
+      );
+    }
+
+    this.assert(
+        isSubsetOf(obj, subset) && isSubsetOf(subset, obj)
+        , 'expected #{this} to have the same members as #{act}'
+        , 'expected #{this} to not have the same members as #{act}'
+        , obj
+        , subset
+    );
+  });
+};
+
+});
+require.register("chai/lib/chai/interface/assert.js", function(exports, require, module){
+/*!
+ * chai
+ * Copyright(c) 2011-2013 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
+   * @api public
+   */
+
+  var assert = chai.assert = function (express, errmsg) {
+    var test = new Assertion(null);
+    test.assert(
+        express
+      , errmsg
+      , '[ negation message unavailable ]'
+    );
+  };
+
+  /**
+   * ### .fail(actual, expected, [message], [operator])
+   *
+   * Throw a failure. Node.js `assert` module-compatible.
+   *
+   * @name fail
+   * @param {Mixed} actual
+   * @param {Mixed} expected
+   * @param {String} message
+   * @param {String} operator
+   * @api public
+   */
+
+  assert.fail = function (actual, expected, message, operator) {
+    throw new chai.AssertionError({
+        actual: actual
+      , expected: expected
+      , message: message
+      , operator: operator
+      , stackStartFunction: assert.fail
+    });
+  };
+
+  /**
+   * ### .ok(object, [message])
+   *
+   * Asserts that `object` is truthy.
+   *
+   *     assert.ok('everything', 'everything is ok');
+   *     assert.ok(false, 'this will fail');
+   *
+   * @name ok
+   * @param {Mixed} object to test
+   * @param {String} message
+   * @api public
+   */
+
+  assert.ok = function (val, msg) {
+    new Assertion(val, msg).is.ok;
+  };
+
+  /**
+   * ### .notOk(object, [message])
+   *
+   * Asserts that `object` is falsy.
+   *
+   *     assert.notOk('everything', 'this will fail');
+   *     assert.notOk(false, 'this will pass');
+   *
+   * @name notOk
+   * @param {Mixed} object to test
+   * @param {String} message
+   * @api public
+   */
+
+  assert.notOk = function (val, msg) {
+    new Assertion(val, msg).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
+   * @api public
+   */
+
+  assert.equal = function (act, exp, msg) {
+    var test = new Assertion(act, msg);
+
+    test.assert(
+        exp == flag(test, 'object')
+      , 'expected #{this} to equal #{exp}'
+      , 'expected #{this} to not equal #{act}'
+      , exp
+      , act
+    );
+  };
+
+  /**
+   * ### .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
+   * @api public
+   */
+
+  assert.notEqual = function (act, exp, msg) {
+    var test = new Assertion(act, msg);
+
+    test.assert(
+        exp != flag(test, 'object')
+      , 'expected #{this} to not equal #{exp}'
+      , 'expected #{this} to equal #{act}'
+      , exp
+      , act
+    );
+  };
+
+  /**
+   * ### .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
+   * @api public
+   */
+
+  assert.strictEqual = function (act, exp, msg) {
+    new Assertion(act, msg).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
+   * @api public
+   */
+
+  assert.notStrictEqual = function (act, exp, msg) {
+    new Assertion(act, msg).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
+   * @api public
+   */
+
+  assert.deepEqual = function (act, exp, msg) {
+    new Assertion(act, msg).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
+   * @api public
+   */
+
+  assert.notDeepEqual = function (act, exp, msg) {
+    new Assertion(act, msg).to.not.eql(exp);
+  };
+
+  /**
+   * ### .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
+   * @api public
+   */
+
+  assert.isTrue = function (val, msg) {
+    new Assertion(val, msg).is['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
+   * @api public
+   */
+
+  assert.isFalse = function (val, msg) {
+    new Assertion(val, msg).is['false'];
+  };
+
+  /**
+   * ### .isNull(value, [message])
+   *
+   * Asserts that `value` is null.
+   *
+   *     assert.isNull(err, 'there was no error');
+   *
+   * @name isNull
+   * @param {Mixed} value
+   * @param {String} message
+   * @api public
+   */
+
+  assert.isNull = function (val, msg) {
+    new Assertion(val, msg).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
+   * @api public
+   */
+
+  assert.isNotNull = function (val, msg) {
+    new Assertion(val, msg).to.not.equal(null);
+  };
+
+  /**
+   * ### .isUndefined(value, [message])
+   *
+   * Asserts that `value` is `undefined`.
+   *
+   *     var tea;
+   *     assert.isUndefined(tea, 'no tea defined');
+   *
+   * @name isUndefined
+   * @param {Mixed} value
+   * @param {String} message
+   * @api public
+   */
+
+  assert.isUndefined = function (val, msg) {
+    new Assertion(val, msg).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
+   * @api public
+   */
+
+  assert.isDefined = function (val, msg) {
+    new Assertion(val, msg).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
+   * @api public
+   */
+
+  assert.isFunction = function (val, msg) {
+    new Assertion(val, msg).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
+   * @api public
+   */
+
+  assert.isNotFunction = function (val, msg) {
+    new Assertion(val, msg).to.not.be.a('function');
+  };
+
+  /**
+   * ### .isObject(value, [message])
+   *
+   * Asserts that `value` is an object (as revealed by
+   * `Object.prototype.toString`).
+   *
+   *     var selection = { name: 'Chai', serve: 'with spices' };
+   *     assert.isObject(selection, 'tea selection is an object');
+   *
+   * @name isObject
+   * @param {Mixed} value
+   * @param {String} message
+   * @api public
+   */
+
+  assert.isObject = function (val, msg) {
+    new Assertion(val, msg).to.be.a('object');
+  };
+
+  /**
+   * ### .isNotObject(value, [message])
+   *
+   * Asserts that `value` is _not_ an object.
+   *
+   *     var selection = 'chai'
+   *     assert.isObject(selection, 'tea selection is not an object');
+   *     assert.isObject(null, 'null is not an object');
+   *
+   * @name isNotObject
+   * @param {Mixed} value
+   * @param {String} message
+   * @api public
+   */
+
+  assert.isNotObject = function (val, msg) {
+    new Assertion(val, msg).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
+   * @api public
+   */
+
+  assert.isArray = function (val, msg) {
+    new Assertion(val, msg).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
+   * @api public
+   */
+
+  assert.isNotArray = function (val, msg) {
+    new Assertion(val, msg).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
+   * @api public
+   */
+
+  assert.isString = function (val, msg) {
+    new Assertion(val, msg).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
+   * @api public
+   */
+
+  assert.isNotString = function (val, msg) {
+    new Assertion(val, msg).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
+   * @api public
+   */
+
+  assert.isNumber = function (val, msg) {
+    new Assertion(val, msg).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
+   * @api public
+   */
+
+  assert.isNotNumber = function (val, msg) {
+    new Assertion(val, msg).to.not.be.a('number');
+  };
+
+  /**
+   * ### .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
+   * @api public
+   */
+
+  assert.isBoolean = function (val, msg) {
+    new Assertion(val, msg).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
+   * @api public
+   */
+
+  assert.isNotBoolean = function (val, msg) {
+    new Assertion(val, msg).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
+   * @api public
+   */
+
+  assert.typeOf = function (val, type, msg) {
+    new Assertion(val, msg).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
+   * @api public
+   */
+
+  assert.notTypeOf = function (val, type, msg) {
+    new Assertion(val, msg).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
+   * @api public
+   */
+
+  assert.instanceOf = function (val, type, msg) {
+    new Assertion(val, msg).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
+   * @api public
+   */
+
+  assert.notInstanceOf = function (val, type, msg) {
+    new Assertion(val, msg).to.not.be.instanceOf(type);
+  };
+
+  /**
+   * ### .include(haystack, needle, [message])
+   *
+   * Asserts that `haystack` includes `needle`. Works
+   * for strings and arrays.
+   *
+   *     assert.include('foobar', 'bar', 'foobar contains string "bar"');
+   *     assert.include([ 1, 2, 3 ], 3, 'array contains value');
+   *
+   * @name include
+   * @param {Array|String} haystack
+   * @param {Mixed} needle
+   * @param {String} message
+   * @api public
+   */
+
+  assert.include = function (exp, inc, msg) {
+    var obj = new Assertion(exp, msg);
+
+    if (Array.isArray(exp)) {
+      obj.to.include(inc);
+    } else if ('string' === typeof exp) {
+      obj.to.contain.string(inc);
+    } else {
+      throw new chai.AssertionError(
+          'expected an array or string'
+        , null
+        , assert.include
+      );
+    }
+  };
+
+  /**
+   * ### .notInclude(haystack, needle, [message])
+   *
+   * Asserts that `haystack` does not include `needle`. Works
+   * for strings and arrays.
+   *i
+   *     assert.notInclude('foobar', 'baz', 'string not include substring');
+   *     assert.notInclude([ 1, 2, 3 ], 4, 'array not include contain value');
+   *
+   * @name notInclude
+   * @param {Array|String} haystack
+   * @param {Mixed} needle
+   * @param {String} message
+   * @api public
+   */
+
+  assert.notInclude = function (exp, inc, msg) {
+    var obj = new Assertion(exp, msg);
+
+    if (Array.isArray(exp)) {
+      obj.to.not.include(inc);
+    } else if ('string' === typeof exp) {
+      obj.to.not.contain.string(inc);
+    } else {
+      throw new chai.AssertionError(
+          'expected an array or string'
+        , null
+        , assert.notInclude
+      );
+    }
+  };
+
+  /**
+   * ### .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
+   * @api public
+   */
+
+  assert.match = function (exp, re, msg) {
+    new Assertion(exp, msg).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
+   * @api public
+   */
+
+  assert.notMatch = function (exp, re, msg) {
+    new Assertion(exp, msg).to.not.match(re);
+  };
+
+  /**
+   * ### .property(object, property, [message])
+   *
+   * Asserts that `object` has a property named by `property`.
+   *
+   *     assert.property({ tea: { green: 'matcha' }}, 'tea');
+   *
+   * @name property
+   * @param {Object} object
+   * @param {String} property
+   * @param {String} message
+   * @api public
+   */
+
+  assert.property = function (obj, prop, msg) {
+    new Assertion(obj, msg).to.have.property(prop);
+  };
+
+  /**
+   * ### .notProperty(object, property, [message])
+   *
+   * Asserts that `object` does _not_ have a property named by `property`.
+   *
+   *     assert.notProperty({ tea: { green: 'matcha' }}, 'coffee');
+   *
+   * @name notProperty
+   * @param {Object} object
+   * @param {String} property
+   * @param {String} message
+   * @api public
+   */
+
+  assert.notProperty = function (obj, prop, msg) {
+    new Assertion(obj, msg).to.not.have.property(prop);
+  };
+
+  /**
+   * ### .deepProperty(object, property, [message])
+   *
+   * Asserts that `object` has a property named by `property`, which can be a
+   * string using dot- and bracket-notation for deep reference.
+   *
+   *     assert.deepProperty({ tea: { green: 'matcha' }}, 'tea.green');
+   *
+   * @name deepProperty
+   * @param {Object} object
+   * @param {String} property
+   * @param {String} message
+   * @api public
+   */
+
+  assert.deepProperty = function (obj, prop, msg) {
+    new Assertion(obj, msg).to.have.deep.property(prop);
+  };
+
+  /**
+   * ### .notDeepProperty(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 deep reference.
+   *
+   *     assert.notDeepProperty({ tea: { green: 'matcha' }}, 'tea.oolong');
+   *
+   * @name notDeepProperty
+   * @param {Object} object
+   * @param {String} property
+   * @param {String} message
+   * @api public
+   */
+
+  assert.notDeepProperty = function (obj, prop, msg) {
+    new Assertion(obj, msg).to.not.have.deep.property(prop);
+  };
+
+  /**
+   * ### .propertyVal(object, property, value, [message])
+   *
+   * Asserts that `object` has a property named by `property` with value given
+   * by `value`.
+   *
+   *     assert.propertyVal({ tea: 'is good' }, 'tea', 'is good');
+   *
+   * @name propertyVal
+   * @param {Object} object
+   * @param {String} property
+   * @param {Mixed} value
+   * @param {String} message
+   * @api public
+   */
+
+  assert.propertyVal = function (obj, prop, val, msg) {
+    new Assertion(obj, msg).to.have.property(prop, val);
+  };
+
+  /**
+   * ### .propertyNotVal(object, property, value, [message])
+   *
+   * Asserts that `object` has a property named by `property`, but with a value
+   * different from that given by `value`.
+   *
+   *     assert.propertyNotVal({ tea: 'is good' }, 'tea', 'is bad');
+   *
+   * @name propertyNotVal
+   * @param {Object} object
+   * @param {String} property
+   * @param {Mixed} value
+   * @param {String} message
+   * @api public
+   */
+
+  assert.propertyNotVal = function (obj, prop, val, msg) {
+    new Assertion(obj, msg).to.not.have.property(prop, val);
+  };
+
+  /**
+   * ### .deepPropertyVal(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 deep
+   * reference.
+   *
+   *     assert.deepPropertyVal({ tea: { green: 'matcha' }}, 'tea.green', 'matcha');
+   *
+   * @name deepPropertyVal
+   * @param {Object} object
+   * @param {String} property
+   * @param {Mixed} value
+   * @param {String} message
+   * @api public
+   */
+
+  assert.deepPropertyVal = function (obj, prop, val, msg) {
+    new Assertion(obj, msg).to.have.deep.property(prop, val);
+  };
+
+  /**
+   * ### .deepPropertyNotVal(object, property, value, [message])
+   *
+   * Asserts that `object` has a property named by `property`, but with a value
+   * different from that given by `value`. `property` can use dot- and
+   * bracket-notation for deep reference.
+   *
+   *     assert.deepPropertyNotVal({ tea: { green: 'matcha' }}, 'tea.green', 'konacha');
+   *
+   * @name deepPropertyNotVal
+   * @param {Object} object
+   * @param {String} property
+   * @param {Mixed} value
+   * @param {String} message
+   * @api public
+   */
+
+  assert.deepPropertyNotVal = function (obj, prop, val, msg) {
+    new Assertion(obj, msg).to.not.have.deep.property(prop, val);
+  };
+
+  /**
+   * ### .lengthOf(object, length, [message])
+   *
+   * Asserts that `object` has a `length` property with the expected value.
+   *
+   *     assert.lengthOf([1,2,3], 3, 'array has length of 3');
+   *     assert.lengthOf('foobar', 5, 'string has length of 6');
+   *
+   * @name lengthOf
+   * @param {Mixed} object
+   * @param {Number} length
+   * @param {String} message
+   * @api public
+   */
+
+  assert.lengthOf = function (exp, len, msg) {
+    new Assertion(exp, msg).to.have.length(len);
+  };
+
+  /**
+   * ### .throws(function, [constructor/string/regexp], [string/regexp], [message])
+   *
+   * Asserts that `function` will throw an error that is an instance of
+   * `constructor`, or alternately that it will throw an error with message
+   * matching `regexp`.
+   *
+   *     assert.throw(fn, 'function throws a reference error');
+   *     assert.throw(fn, /function throws a reference error/);
+   *     assert.throw(fn, ReferenceError);
+   *     assert.throw(fn, ReferenceError, 'function throws a reference error');
+   *     assert.throw(fn, ReferenceError, /function throws a reference error/);
+   *
+   * @name throws
+   * @alias throw
+   * @alias Throw
+   * @param {Function} function
+   * @param {ErrorConstructor} constructor
+   * @param {RegExp} regexp
+   * @param {String} message
+   * @see https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Error#Error_types
+   * @api public
+   */
+
+  assert.Throw = function (fn, errt, errs, msg) {
+    if ('string' === typeof errt || errt instanceof RegExp) {
+      errs = errt;
+      errt = null;
+    }
+
+    new Assertion(fn, msg).to.Throw(errt, errs);
+  };
+
+  /**
+   * ### .doesNotThrow(function, [constructor/regexp], [message])
+   *
+   * Asserts that `function` will _not_ throw an error that is an instance of
+   * `constructor`, or alternately that it will not throw an error with message
+   * matching `regexp`.
+   *
+   *     assert.doesNotThrow(fn, Error, 'function does not throw');
+   *
+   * @name doesNotThrow
+   * @param {Function} function
+   * @param {ErrorConstructor} constructor
+   * @param {RegExp} regexp
+   * @param {String} message
+   * @see https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Error#Error_types
+   * @api public
+   */
+
+  assert.doesNotThrow = function (fn, type, msg) {
+    if ('string' === typeof type) {
+      msg = type;
+      type = null;
+    }
+
+    new Assertion(fn, msg).to.not.Throw(type);
+  };
+
+  /**
+   * ### .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
+   * @api public
+   */
+
+  assert.operator = function (val, operator, val2, msg) {
+    if (!~['==', '===', '>', '>=', '<', '<=', '!=', '!=='].indexOf(operator)) {
+      throw new Error('Invalid operator "' + operator + '"');
+    }
+    var test = new Assertion(eval(val + operator + val2), msg);
+    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
+   * @api public
+   */
+
+  assert.closeTo = function (act, exp, delta, msg) {
+    new Assertion(act, msg).to.be.closeTo(exp, delta);
+  };
+
+  /**
+   * ### .sameMembers(set1, set2, [message])
+   *
+   * Asserts that `set1` and `set2` have the same members.
+   * Order is not taken into account.
+   *
+   *     assert.sameMembers([ 1, 2, 3 ], [ 2, 1, 3 ], 'same members');
+   *
+   * @name sameMembers
+   * @param {Array} superset
+   * @param {Array} subset
+   * @param {String} message
+   * @api public
+   */
+
+  assert.sameMembers = function (set1, set2, msg) {
+    new Assertion(set1, msg).to.have.same.members(set2);
+  }
+
+  /**
+   * ### .includeMembers(superset, subset, [message])
+   *
+   * Asserts that `subset` is included in `superset`.
+   * Order is not taken into account.
+   *
+   *     assert.includeMembers([ 1, 2, 3 ], [ 2, 1 ], 'include members');
+   *
+   * @name includeMembers
+   * @param {Array} superset
+   * @param {Array} subset
+   * @param {String} message
+   * @api public
+   */
+
+  assert.includeMembers = function (superset, subset, msg) {
+    new Assertion(superset, msg).to.include.members(subset);
+  }
+
+  /*!
+   * Undocumented / untested
+   */
+
+  assert.ifError = function (val, msg) {
+    new Assertion(val, msg).to.not.be.ok;
+  };
+
+  /*!
+   * Aliases.
+   */
+
+  (function alias(name, as){
+    assert[as] = assert[name];
+    return alias;
+  })
+  ('Throw', 'throw')
+  ('Throw', 'throws');
+};
+
+});
+require.register("chai/lib/chai/interface/expect.js", function(exports, require, module){
+/*!
+ * chai
+ * Copyright(c) 2011-2013 Jake Luer <jake@alogicalparadox.com>
+ * MIT Licensed
+ */
+
+module.exports = function (chai, util) {
+  chai.expect = function (val, message) {
+    return new chai.Assertion(val, message);
+  };
+};
+
+
+});
+require.register("chai/lib/chai/interface/should.js", function(exports, require, module){
+/*!
+ * chai
+ * Copyright(c) 2011-2013 Jake Luer <jake@alogicalparadox.com>
+ * MIT Licensed
+ */
+
+module.exports = function (chai, util) {
+  var Assertion = chai.Assertion;
+
+  function loadShould () {
+    // modify Object.prototype to have `should`
+    Object.defineProperty(Object.prototype, 'should',
+      {
+        set: function (value) {
+          // See https://github.com/chaijs/chai/issues/86: this makes
+          // `whatever.should = someValue` actually set `someValue`, which is
+          // especially useful for `global.should = require('chai').should()`.
+          //
+          // Note that we have to use [[DefineProperty]] instead of [[Put]]
+          // since otherwise we would trigger this very setter!
+          Object.defineProperty(this, 'should', {
+            value: value,
+            enumerable: true,
+            configurable: true,
+            writable: true
+          });
+        }
+      , get: function(){
+          if (this instanceof String || this instanceof Number) {
+            return new Assertion(this.constructor(this));
+          } else if (this instanceof Boolean) {
+            return new Assertion(this == true);
+          }
+          return new Assertion(this);
+        }
+      , configurable: true
+    });
+
+    var should = {};
+
+    should.equal = function (val1, val2, msg) {
+      new Assertion(val1, msg).to.equal(val2);
+    };
+
+    should.Throw = function (fn, errt, errs, msg) {
+      new Assertion(fn, msg).to.Throw(errt, errs);
+    };
+
+    should.exist = function (val, msg) {
+      new Assertion(val, msg).to.exist;
+    }
+
+    // negation
+    should.not = {}
+
+    should.not.equal = function (val1, val2, msg) {
+      new Assertion(val1, msg).to.not.equal(val2);
+    };
+
+    should.not.Throw = function (fn, errt, errs, msg) {
+      new Assertion(fn, msg).to.not.Throw(errt, errs);
+    };
+
+    should.not.exist = function (val, msg) {
+      new Assertion(val, msg).to.not.exist;
+    }
+
+    should['throw'] = should['Throw'];
+    should.not['throw'] = should.not['Throw'];
+
+    return should;
+  };
+
+  chai.should = loadShould;
+  chai.Should = loadShould;
+};
+
+});
+require.register("chai/lib/chai/utils/addChainableMethod.js", function(exports, require, module){
+/*!
+ * Chai - addChainingMethod utility
+ * Copyright(c) 2012-2013 Jake Luer <jake@alogicalparadox.com>
+ * MIT Licensed
+ */
+
+/*!
+ * Module dependencies
+ */
+
+var transferFlags = require('./transferFlags');
+
+/*!
+ * Module variables
+ */
+
+// Check whether `__proto__` is supported
+var hasProtoSupport = '__proto__' in Object;
+
+// Without `__proto__` support, this module will need to add properties to a function.
+// However, some Function.prototype methods cannot be overwritten,
+// and there seems no easy cross-platform way to detect them (@see chaijs/chai/issues/69).
+var excludeNames = /^(?:length|name|arguments|caller)$/;
+
+// Cache `Function` properties
+var call  = Function.prototype.call,
+    apply = Function.prototype.apply;
+
+/**
+ * ### addChainableMethod (ctx, name, method, chainingBehavior)
+ *
+ * Adds a method to an object, such that the method can also be chained.
+ *
+ *     utils.addChainableMethod(chai.Assertion.prototype, 'foo', function (str) {
+ *       var obj = utils.flag(this, 'object');
+ *       new chai.Assertion(obj).to.be.equal(str);
+ *     });
+ *
+ * Can also be accessed directly from `chai.Assertion`.
+ *
+ *     chai.Assertion.addChainableMethod('foo', fn, chainingBehavior);
+ *
+ * The result can then be used as both a method assertion, executing both `method` and
+ * `chainingBehavior`, or as a language chain, which only executes `chainingBehavior`.
+ *
+ *     expect(fooStr).to.be.foo('bar');
+ *     expect(fooStr).to.be.foo.equal('foo');
+ *
+ * @param {Object} ctx object to which the method is added
+ * @param {String} name of method to add
+ * @param {Function} method function to be used for `name`, when called
+ * @param {Function} chainingBehavior function to be called every time the property is accessed
+ * @name addChainableMethod
+ * @api public
+ */
+
+module.exports = function (ctx, name, method, chainingBehavior) {
+  if (typeof chainingBehavior !== 'function')
+    chainingBehavior = function () { };
+
+  Object.defineProperty(ctx, name,
+    { get: function () {
+        chainingBehavior.call(this);
+
+        var assert = function () {
+          var result = method.apply(this, arguments);
+          return result === undefined ? this : result;
+        };
+
+        // Use `__proto__` if available
+        if (hasProtoSupport) {
+          // Inherit all properties from the object by replacing the `Function` prototype
+          var prototype = assert.__proto__ = Object.create(this);
+          // Restore the `call` and `apply` methods from `Function`
+          prototype.call = call;
+          prototype.apply = apply;
+        }
+        // Otherwise, redefine all properties (slow!)
+        else {
+          var asserterNames = Object.getOwnPropertyNames(ctx);
+          asserterNames.forEach(function (asserterName) {
+            if (!excludeNames.test(asserterName)) {
+              var pd = Object.getOwnPropertyDescriptor(ctx, asserterName);
+              Object.defineProperty(assert, asserterName, pd);
+            }
+          });
+        }
+
+        transferFlags(this, assert);
+        return assert;
+      }
+    , configurable: true
+  });
+};
+
+});
+require.register("chai/lib/chai/utils/addMethod.js", function(exports, require, module){
+/*!
+ * Chai - addMethod utility
+ * Copyright(c) 2012-2013 Jake Luer <jake@alogicalparadox.com>
+ * MIT Licensed
+ */
+
+/**
+ * ### .addMethod (ctx, name, method)
+ *
+ * Adds a method to the prototype of an object.
+ *
+ *     utils.addMethod(chai.Assertion.prototype, 'foo', function (str) {
+ *       var obj = utils.flag(this, 'object');
+ *       new chai.Assertion(obj).to.be.equal(str);
+ *     });
+ *
+ * Can also be accessed directly from `chai.Assertion`.
+ *
+ *     chai.Assertion.addMethod('foo', fn);
+ *
+ * Then can be used as any other assertion.
+ *
+ *     expect(fooStr).to.be.foo('bar');
+ *
+ * @param {Object} ctx object to which the method is added
+ * @param {String} name of method to add
+ * @param {Function} method function to be used for name
+ * @name addMethod
+ * @api public
+ */
+
+module.exports = function (ctx, name, method) {
+  ctx[name] = function () {
+    var result = method.apply(this, arguments);
+    return result === undefined ? this : result;
+  };
+};
+
+});
+require.register("chai/lib/chai/utils/addProperty.js", function(exports, require, module){
+/*!
+ * Chai - addProperty utility
+ * Copyright(c) 2012-2013 Jake Luer <jake@alogicalparadox.com>
+ * MIT Licensed
+ */
+
+/**
+ * ### addProperty (ctx, name, getter)
+ *
+ * Adds a property to the prototype of an object.
+ *
+ *     utils.addProperty(chai.Assertion.prototype, 'foo', function () {
+ *       var obj = utils.flag(this, 'object');
+ *       new chai.Assertion(obj).to.be.instanceof(Foo);
+ *     });
+ *
+ * Can also be accessed directly from `chai.Assertion`.
+ *
+ *     chai.Assertion.addProperty('foo', fn);
+ *
+ * Then can be used as any other assertion.
+ *
+ *     expect(myFoo).to.be.foo;
+ *
+ * @param {Object} ctx object to which the property is added
+ * @param {String} name of property to add
+ * @param {Function} getter function to be used for name
+ * @name addProperty
+ * @api public
+ */
+
+module.exports = function (ctx, name, getter) {
+  Object.defineProperty(ctx, name,
+    { get: function () {
+        var result = getter.call(this);
+        return result === undefined ? this : result;
+      }
+    , configurable: true
+  });
+};
+
+});
+require.register("chai/lib/chai/utils/eql.js", function(exports, require, module){
+// This is (almost) directly from Node.js assert
+// https://github.com/joyent/node/blob/f8c335d0caf47f16d31413f89aa28eda3878e3aa/lib/assert.js
+
+module.exports = _deepEqual;
+
+var getEnumerableProperties = require('./getEnumerableProperties');
+
+// for the browser
+var Buffer;
+try {
+  Buffer = require('buffer').Buffer;
+} catch (ex) {
+  Buffer = {
+    isBuffer: function () { return false; }
+  };
+}
+
+function _deepEqual(actual, expected, memos) {
+
+  // 7.1. All identical values are equivalent, as determined by ===.
+  if (actual === expected) {
+    return true;
+
+  } else if (Buffer.isBuffer(actual) && Buffer.isBuffer(expected)) {
+    if (actual.length != expected.length) return false;
+
+    for (var i = 0; i < actual.length; i++) {
+      if (actual[i] !== expected[i]) return false;
+    }
+
+    return true;
+
+  // 7.2. If the expected value is a Date object, the actual value is
+  // equivalent if it is also a Date object that refers to the same time.
+  } else if (expected instanceof Date) {
+    if (!(actual instanceof Date)) return false;
+    return actual.getTime() === expected.getTime();
+
+  // 7.3. Other pairs that do not both pass typeof value == 'object',
+  // equivalence is determined by ==.
+  } else if (typeof actual != 'object' && typeof expected != 'object') {
+    return actual === expected;
+
+  } else if (expected instanceof RegExp) {
+    if (!(actual instanceof RegExp)) return false;
+    return actual.toString() === expected.toString();
+
+  // 7.4. For all other Object pairs, including Array objects, equivalence is
+  // determined by having the same number of owned properties (as verified
+  // with Object.prototype.hasOwnProperty.call), the same set of keys
+  // (although not necessarily the same order), equivalent values for every
+  // corresponding key, and an identical 'prototype' property. Note: this
+  // accounts for both named and indexed properties on Arrays.
+  } else {
+    return objEquiv(actual, expected, memos);
+  }
+}
+
+function isUndefinedOrNull(value) {
+  return value === null || value === undefined;
+}
+
+function isArguments(object) {
+  return Object.prototype.toString.call(object) == '[object Arguments]';
+}
+
+function objEquiv(a, b, memos) {
+  if (isUndefinedOrNull(a) || isUndefinedOrNull(b))
+    return false;
+
+  // an identical 'prototype' property.
+  if (a.prototype !== b.prototype) return false;
+
+  // check if we have already compared a and b
+  var i;
+  if (memos) {
+    for(i = 0; i < memos.length; i++) {
+      if ((memos[i][0] === a && memos[i][1] === b) ||
+          (memos[i][0] === b && memos[i][1] === a))
+        return true;
+    }
+  } else {
+    memos = [];
+  }
+
+  //~~~I've managed to break Object.keys through screwy arguments passing.
+  //   Converting to array solves the problem.
+  if (isArguments(a)) {
+    if (!isArguments(b)) {
+      return false;
+    }
+    a = pSlice.call(a);
+    b = pSlice.call(b);
+    return _deepEqual(a, b, memos);
+  }
+  try {
+    var ka = getEnumerableProperties(a),
+        kb = getEnumerableProperties(b),
+        key;
+  } catch (e) {//happens when one is a string literal and the other isn't
+    return false;
+  }
+
+  // having the same number of owned properties (keys incorporates
+  // hasOwnProperty)
+  if (ka.length != kb.length)
+    return false;
+
+  //the same set of keys (although not necessarily the same order),
+  ka.sort();
+  kb.sort();
+  //~~~cheap key test
+  for (i = ka.length - 1; i >= 0; i--) {
+    if (ka[i] != kb[i])
+      return false;
+  }
+
+  // remember objects we have compared to guard against circular references
+  memos.push([ a, b ]);
+
+  //equivalent values for every corresponding key, and
+  //~~~possibly expensive deep test
+  for (i = ka.length - 1; i >= 0; i--) {
+    key = ka[i];
+    if (!_deepEqual(a[key], b[key], memos)) return false;
+  }
+
+  return true;
+}
+
+});
+require.register("chai/lib/chai/utils/flag.js", function(exports, require, module){
+/*!
+ * Chai - flag utility
+ * Copyright(c) 2012-2013 Jake Luer <jake@alogicalparadox.com>
+ * MIT Licensed
+ */
+
+/**
+ * ### flag(object ,key, [value])
+ *
+ * Get or set a flag value on an object. If a
+ * value is provided it will be set, else it will
+ * return the currently set value or `undefined` if
+ * the value is not set.
+ *
+ *     utils.flag(this, 'foo', 'bar'); // setter
+ *     utils.flag(this, 'foo'); // getter, returns `bar`
+ *
+ * @param {Object} object (constructed Assertion
+ * @param {String} key
+ * @param {Mixed} value (optional)
+ * @name flag
+ * @api private
+ */
+
+module.exports = function (obj, key, value) {
+  var flags = obj.__flags || (obj.__flags = Object.create(null));
+  if (arguments.length === 3) {
+    flags[key] = value;
+  } else {
+    return flags[key];
+  }
+};
+
+});
+require.register("chai/lib/chai/utils/getActual.js", function(exports, require, module){
+/*!
+ * Chai - getActual utility
+ * Copyright(c) 2012-2013 Jake Luer <jake@alogicalparadox.com>
+ * MIT Licensed
+ */
+
+/**
+ * # getActual(object, [actual])
+ *
+ * Returns the `actual` value for an Assertion
+ *
+ * @param {Object} object (constructed Assertion)
+ * @param {Arguments} chai.Assertion.prototype.assert arguments
+ */
+
+module.exports = function (obj, args) {
+  var actual = args[4];
+  return 'undefined' !== typeof actual ? actual : obj._obj;
+};
+
+});
+require.register("chai/lib/chai/utils/getEnumerableProperties.js", function(exports, require, module){
+/*!
+ * Chai - getEnumerableProperties utility
+ * Copyright(c) 2012-2013 Jake Luer <jake@alogicalparadox.com>
+ * MIT Licensed
+ */
+
+/**
+ * ### .getEnumerableProperties(object)
+ *
+ * This allows the retrieval of enumerable property names of an object,
+ * inherited or not.
+ *
+ * @param {Object} object
+ * @returns {Array}
+ * @name getEnumerableProperties
+ * @api public
+ */
+
+module.exports = function getEnumerableProperties(object) {
+  var result = [];
+  for (var name in object) {
+    result.push(name);
+  }
+  return result;
+};
+
+});
+require.register("chai/lib/chai/utils/getMessage.js", function(exports, require, module){
+/*!
+ * Chai - message composition utility
+ * C

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