feat(facade): toUpperCase and toLowerCase

modules/angular2/test/facade/lang_spec.js

@@ -1,7 +1,7 @@
 import {describe, it, expect, beforeEach, ddescribe, iit, xit, el} from 'angular2/test_lib';
 
 import {ListWrapper} from 'angular2/src/facade/collection';
-import {isPresent, RegExpWrapper, RegExpMatcherWrapper, CONST_EXPR} from 'angular2/src/facade/lang';
+import {isPresent, RegExpWrapper, RegExpMatcherWrapper, StringWrapper, CONST_EXPR} from 'angular2/src/facade/lang';
 
 export function main() {
   describe('RegExp', () => {
@@ -20,13 +20,34 @@ export function main() {
 
       expect(indexes).toEqual([1, 4, 8, 9]);
     })
- });
+  });
 
   describe('const', () => {
     it('should support const expressions both in TS and Dart', () => {
       const numbers = CONST_EXPR([1, 2, 3]);
       expect(numbers).toEqual([1, 2, 3]);
     })
- });
+  });
+
+  describe('String', () => {
+    var upper, lower;
+
+    beforeEach(() => {
+      upper = 'SOMETHING'
+      lower = 'something';
+    });
+
+    it('should upper case a string', () => {
+      var str = StringWrapper.toUpperCase(lower);
+
+      expect(str).toEqual(upper);
+    });
+
+    it('should lower case a string', () => {
+      var str = StringWrapper.toLowerCase(upper);
+
+      expect(str).toEqual(lower);
+    });
+  });
 
 }