A Simple BDD (Behaviour Driven Development) library for JavaScript.

/*
 * A Simple BDD (Behaviour Driven Development) library for JavaScript.
 *
 *   Copyright (c) 2008  Takanori Ishikawa  <takanori.ishikawa@gmail.com>
 *   All rights reserved.
 *
 *   Redistribution and use in source and binary forms, with or without
 *   modification, are permitted provided that the following conditions
 *   are met:
 * 
 *   1. Redistributions of source code must retain the above copyright
 *      notice, this list of conditions and the following disclaimer.
 *
 *   2. Redistributions in binary form must reproduce the above copyright
 *      notice, this list of conditions and the following disclaimer in the
 *      documentation and/or other materials provided with the distribution.
 *
 *   3. Neither the name of the authors nor the names of its contributors
 *      may be used to endorse or promote products derived from this
 *      software without specific prior written permission.
 *
 *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
 *   TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 *   PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 *   LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 *   NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 *   SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
/**
 * A Tiny JavaScript liberary for Behaviour-Driven Development (BDD).
 *
 *   Author: Takanori Ishikawa <takanori.ishikawa@gmail.com>
 *   Copyright: Takanori Ishikawa 2008
 *   License: BSD License (see above)
 *
 * Supported Browsers:
 *   [Win] IE 6, Firefox 2
 *   [Mac] Safari 3, Firefox 2
 *
 * Usage:
 *   Spec.describe("Spec.should", function() {
 *     "simple values": function() {
 *       "should": function() {
 *         Spec.should(true);
 *         Spec.should(1);
 *       }, 
 *       ...
 *     },
 *     ...
 *   });
 *
 * See Also:
 *   Behavior Driven Development - Wikipedia, the free encyclopedia
 *   http://en.wikipedia.org/wiki/Behavior_driven_development
 *
 */
 
 
/**
 * Spec is the BDD style test utilities.
 */
var Spec = {
  /** Replace the Spec.describe function with empty function if false. */
  enabled: true,
 
  /** Indicates whether object 'a' is "equal to" 'b'. */
  equals: function(a, b) {
    if (a instanceof Array && b instanceof Array) {
      if (a.length != b.length) return false;
      for (var i = 0; i < a.length; i++) if (!Spec.equals(a[i], b[i])) return false;
      return true;
    }
    if ((a != null && b != null) && (typeof a == "object" && typeof b == "object")) {
      for (var i in a) if (!Spec.equals(a[i], b[i])) return false;
      return true;
    }
    return (a == b);
  },
 
  /** equivalent to xUint's assert */
  should: function(expection, message) {
    Spec.currentIndicator++;
    if (!expection) {
      var warning = [
        "[Spec failed",
        Spec.currentTitle ? " (" + Spec.currentTitle + ")] " : "] ",
        (message || (Spec.currentMessage + " " + Spec.currentIndicator) || "")
      ].join("");
 
      alert(warning);
      throw warning;
    }
    return !!expection;
  },
 
  /** Write your specification by using describe method. */
  describe: function(title, spec) {
    Spec.currentTitle = title;
    for (var name in spec) {
      Spec.currentMessage = name;
      Spec.currentIndicator = 0;
      spec[name]();
      Spec.currentIndicator = null;
    }
    Spec.currentMessage = Spec.currentTitle = null;
  },
  Version: "0.1"
};
 
// Other BDD style stuffs.
Spec.should.equal = function(a, b, message) { return Spec.should(Spec.equals(a, b), message); };
Spec.should.not = function(a, message) { return Spec.should(!a, message); };
Spec.should.not.equal = function(a, b, message) { return Spec.should(!Spec.equals(a, b), message); };
if (!Spec.enabled) Spec.describe = function(){};
 
 
// self test
Spec.describe("Spec object", {
  "should": function() {
    Spec.should(true);
    Spec.should(1);
  }, 
  "should.not": function() {
    Spec.should.not(false);
    Spec.should.not(0);
  },
  "should.equal": function() {
    Spec.should.equal(null, null);
    Spec.should.equal("", "");
    Spec.should.equal(12345, 12345);
    Spec.should.equal([0,1,2], [0,1,2]);
    Spec.should.equal([0,1,[0,1,2]], [0,1,[0,1,2]]);
    Spec.should.equal({}, {});
    Spec.should.equal({x:1}, {x:1});
    Spec.should.equal({x:[1]}, {x:[1]});
  },
  "should.not.equal": function() {
    Spec.should.not.equal([1,2,3], [1,2,3,4]);
    Spec.should.not.equal({x:1}, [1,2,3,4]);
  }
});