text: YUI.add('lang-test', function (Y) {
  
  var Assert = Y.Assert,
      Lang   = Y.Lang,
  
      doc = Y.config.doc,
  
      // A string comprised of only whitespace, as defined by ES 5.
      WHITESPACE = "\x09\x0A\x0B\x0C\x0D\x20\xA0\u1680\u180E\u2000\u2001\u2002\u2003\u2004\u2005\u2006\u2007\u2008\u2009\u200A\u2028\u2029\u202F\u205F\u3000\uFEFF",
  
      suite = new Y.Test.Suite('YUI: Lang');
  
  suite.add(new Y.Test.Case({
      name: 'Lang tests',
  
      _should: {
          ignore: {
              test_is_array_dom: (Y.UA.nodejs)
          }
      },
      '_isNative() should return true for native functions': function () {
          Assert.isTrue(Lang._isNative(Object.prototype.toString), 'Object.prototype.toString is native');
          Assert.isTrue(Lang._isNative(Array.prototype.concat), 'Array.prototype.concat is native');
          Assert.isTrue(Lang._isNative(String.prototype.replace), 'String.prototype.replace is native');
  
          if (doc) { // may not exist in Node.js
              Assert.isTrue(Lang._isNative(doc.getElementById), 'document.getElementById is native');
              Assert.isTrue(Lang._isNative(doc.getElementsByTagName('body')[0].cloneNode), 'DOM cloneNode() is native');
          }
      },
  
      '_isNative() should return false for non-native functions': function () {
          Assert.isFalse(Lang._isNative(Lang._isNative), 'Lang._isNative is not native');
          Assert.isFalse(Lang._isNative(YUI), 'YUI is not native');
          Assert.isFalse(Lang._isNative(function () {}, 'An anonymous function is not native'));
          Assert.isFalse(Lang._isNative(function () { '[native code]' }, 'Tricky non-native function is not native'));
          Assert.isFalse(Lang._isNative(function () { return '[native code]'; }, 'Anothre tricky non-native function is not native'));
      },
  
      test_is_array: function() {
          Assert.isTrue(Lang.isArray([1, 2]), "Array literals are arrays");
          Assert.isFalse(Lang.isArray({"one": "two"}), "Object literals are not arrays");
  
          var a = [];
          a["one"] = "two";
          Assert.isTrue(Lang.isArray(a), "'Associative' arrays are arrays");
      },
  
      test_is_array_dom: function() {
  
          // TODO: Does this really all need to be excluded for nodejs?
  
          // Seems like only the dom stuff needs to be excluded.
          // The other stuff is basic array stuff.
  
          Assert.isFalse(Lang.isArray(document.getElementsByTagName("body")),
                  "Element collections are array-like, but not arrays");
  
          Assert.isFalse(Lang.isArray(null), "null is not an array");
          Assert.isFalse(Lang.isArray(''), "'' is not an array");
          Assert.isFalse(Lang.isArray(undefined), "undefined is not an array");
  
          if (Array.isArray) {
              Assert.areSame(Array.isArray, Lang.isArray, 'Lang.isArray() should use native Array.isArray() when available');
          }
      },
  
      test_is_boolean: function() {
          Assert.isTrue(Lang.isBoolean(false), "false failed boolean check");
          Assert.isFalse(Lang.isBoolean(1), "the number 1 is not a boolean");
          Assert.isFalse(Lang.isBoolean("true"), "the string 'true' is not a boolean");
      },
  
      test_is_function: function() {
          Assert.isTrue(Lang.isFunction(function(){}), "a function is a function");
          Assert.isFalse(Lang.isFunction({foo: "bar"}), "an object is not a function");
      },
  
      test_is_null: function() {
          Assert.isTrue(Lang.isNull(null), "null is null");
          Assert.isFalse(Lang.isNull(undefined), "undefined is not null");
          Assert.isFalse(Lang.isNull(""), "empty string is not null");
      },
  
      test_is_number: function() {
          Assert.isTrue(Lang.isNumber(0), "0 is a number");
          Assert.isTrue(Lang.isNumber(123.123), "123.123 is a number");
          Assert.isFalse(Lang.isNumber('123.123'), "the string '123.123' is not a number, even though it can be cast into one");
          Assert.isFalse(Lang.isNumber(1/0), "undefined numbers and infinity are not numbers we want to use");
      },
  
      test_is_object: function() {
          Assert.isTrue(Lang.isObject({}), "an object is an object");
          Assert.isTrue(Lang.isObject(function(){}), "a function is an object");
          Assert.isTrue(Lang.isObject([]), "an array is an object");
          Assert.isFalse(Lang.isObject(1), "numbers are not objects");
          Assert.isFalse(Lang.isObject(true), "boolean values are not objects");
          Assert.isFalse(Lang.isObject("{}"), "strings are not objects");
          Assert.isFalse(Lang.isObject(null), "null should return false even though it technically is an object");
      },
  
      test_is_string: function() {
          Assert.isTrue(Lang.isString("{}"), "a string is a string");
          Assert.isFalse(Lang.isString({foo: "bar"}), "an object is not a string");
          Assert.isFalse(Lang.isString(123), "a number is not a string");
          Assert.isFalse(Lang.isString(true), "boolean values are not strings");
      },
  
      test_is_undefined: function() {
          Assert.isTrue(Lang.isUndefined(undefined), "undefined is undefined");
          Assert.isFalse(Lang.isUndefined(false), "boolean false is not undefined");
          Assert.isFalse(Lang.isUndefined(null), "null is not undefined");
      },
  
      test_trim: function() {
          Assert.areEqual(Lang.trim("  My String"), "My String");
          Assert.areEqual(Lang.trim("My String  "), "My String");
          Assert.areEqual(Lang.trim("  My String  "), "My String");
          Assert.areEqual(Lang.trim(WHITESPACE).length, 0);
          Assert.areEqual(Lang.trim(null), null);
          Assert.areEqual(Lang.trim(undefined), undefined);
          Assert.areEqual(Lang.trim({}), "[object Object]");
      },
  
      test_trim_left: function() {
          Assert.areEqual(Lang.trimLeft("  My String"), "My String");
          Assert.areEqual(Lang.trimLeft("My String  "), "My String  ");
          Assert.areEqual(Lang.trimLeft("  My String  "), "My String  ");
          Assert.areEqual(Lang.trimLeft(WHITESPACE + "My String"), "My String");
      },
  
      test_trim_right: function() {
          Assert.areEqual(Lang.trimRight("  My String"), "  My String");
          Assert.areEqual(Lang.trimRight("My String  "), "My String");
          Assert.areEqual(Lang.trimRight("  My String  "), "  My String");
          Assert.areEqual(Lang.trimRight("My String" + WHITESPACE), "My String");
      },
  
      test_is_value: function() {
          Assert.isFalse(Lang.isValue(null), "null should be false");
          Assert.isFalse(Lang.isValue(undefined), "undefined should be false");
          Assert.isFalse(Lang.isValue(parseInt("adsf", 10)), "NaN should be false");
          Assert.isFalse(Lang.isValue(1/0), "undefined numbers and infinity should be false");
          Assert.isTrue(Lang.isValue(new Date()), "date should be true");
          Assert.isTrue(Lang.isValue(""), "Empty string should be true");
          Assert.isTrue(Lang.isValue(false), "false should be true");
      },
  
      test_is_date: function() {
          Assert.isFalse(Lang.isDate(null), "null should be false");
          Assert.isFalse(Lang.isDate(undefined), "undefined should be false");
          Assert.isFalse(Lang.isDate(parseInt("adsf", 10)), "NaN should be false");
          Assert.isFalse(Lang.isDate(1/0), "undefined numbers and infinity should be false");
          Assert.isFalse(Lang.isDate(NaN), "NaN should be false");
          Assert.isTrue(Lang.isDate(new Date()), "date should be true");
          Assert.isFalse(Lang.isDate(""), "Empty string should be false");
          Assert.isFalse(Lang.isDate(false), "false should be false");
  
          var badDateObj = new Date('junk');
          Assert.isFalse(Lang.isDate(badDateObj), "A date object containing and invalid date should be false.");
      },
  
      test_now: function () {
          Assert.isNumber(Lang.now(), 'Lang.now() should return the current time in milliseconds');
  
          if (Date.now) {
              Assert.areSame(Date.now, Lang.now, 'Lang.now() should be native Date.now() when available');
          }
      },
  
      test_sub: function () {
          Assert.areSame(
              'foo foo bar bar {baz} false 0',
              Lang.sub('foo {foo} bar {bar} {baz} {moo} {zoo}', {foo: 'foo', bar: 'bar', moo: false, zoo: 0}),
              'should replace placeholders'
          );
  
          Assert.areSame(
              'foo foo bar {bar}',
              Lang.sub('foo { foo } bar {bar}', {foo: 'foo'}),
              'whitespace inside a placeholder is ignored'
          );
  
          Assert.areSame(
              'foo foo bar {bar}',
              Lang.sub('foo {foo|moo} bar {bar}', {foo: 'foo'}),
              'anything after a pipe inside a placeholder is ignored'
          );
      }
  }));
  
  Y.Test.Runner.add(suite);
  
  }, '@VERSION@', {requires: ['test']});
  