fix(router): ensure that root URL redirect doesn't redirect non-root URLs

Closes #2221

modules/angular2/src/router/route_recognizer.ts

@@ -57,8 +57,12 @@ export class RouteRecognizer {
     var solutions = ListWrapper.create();
 
     MapWrapper.forEach(this.redirects, (target, path) => {
-      // TODO: "/" redirect case
-      if (StringWrapper.startsWith(url, path)) {
+      // "/" redirect case
+      if (path == '/' || path == '') {
+        if (path == url) {
+          url = target;
+        }
+      } else if (StringWrapper.startsWith(url, path)) {
         url = target + StringWrapper.substring(url, path.length);
       }
     });

modules/angular2/test/router/route_recognizer_spec.ts

@@ -76,6 +76,32 @@ export function main() {
       expect(solution.matchedUrl).toEqual('/b');
     });
 
+    it('should not perform root URL redirect on a non-root route', () => {
+      recognizer.addRedirect('/', '/foo');
+      recognizer.addConfig('/bar', handler);
+      var solutions = recognizer.recognize('/bar');
+      expect(solutions.length).toBe(1);
+
+      var solution = solutions[0];
+      expect(solution.handler).toEqual(handler);
+      expect(solution.matchedUrl).toEqual('/bar');
+    });
+
+    it('should perform a valid redirect when a slash or an empty string is being processed', () => {
+      recognizer.addRedirect('/', '/matias');
+      recognizer.addRedirect('', '/fatias');
+
+      recognizer.addConfig('/matias', handler);
+      recognizer.addConfig('/fatias', handler);
+
+      var solutions;
+
+      solutions = recognizer.recognize('/');
+      expect(solutions[0].matchedUrl).toBe('/matias');
+
+      solutions = recognizer.recognize('');
+      expect(solutions[0].matchedUrl).toBe('/fatias');
+    });
 
     it('should generate URLs', () => {
       recognizer.addConfig('/app/user/:name', handler, 'user');