added unit testing, and started implementing unit tests...phew

node_modules/assertion-error/index.js

@@ -0,0 +1,116 @@
+/*!
+ * 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 || AssertionError;
+  if (Error.captureStackTrace) {
+    Error.captureStackTrace(this, ssf);
+  } else {
+    try {
+      throw new Error();
+    } catch(e) {
+      this.stack = e.stack;
+    }
+  }
+}
+
+/*!
+ * 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;
+};