Fix some tests

platform/platform-tests.ts

@@ -1,6 +1,6 @@
 /// <reference path="platform.d.ts" />
 
-declare interface ITestContainer {
+interface ITestContainer {
     [name: string]: PlatformStatic;
 }
 
@@ -54,7 +54,7 @@ function runTests() {
 
 
         onFalse = (name: string) => {
-            return function () => {
+            return () => {
                 console.log('\tfailed on prop "' + name + '" for "' + n + '"');
             }
         }

platform/platform.d.ts

@@ -14,8 +14,8 @@ interface PlatformStatic {
     ua?: string;
     version?: string;
     os?: PlatformOS;
-    parse(ua: string): PlatformStatic;
-    toString(): string;
+    parse?(ua: string): PlatformStatic;
+    toString?(): string;
 }
 
 interface PlatformOS {