feat(test_lib): implement SpyObject

modules/rtts_assert/src/rtts_assert.es6

@@ -13,6 +13,9 @@ function argPositionName(i) {
 
 var primitives = $traceurRuntime.type;
 
+export function proxy(){
+}
+
 function assertArgumentTypes(...params) {
   var actual, type;
   var currentArgErrors;
@@ -78,11 +81,14 @@ function prettyPrint(value) {
 }
 
 function isType(value, T, errors) {
-
   if (T === primitives.void) {
     return typeof value === 'undefined';
   }
 
+  if (_isProxy(value)) {
+    return true;
+  }
+
   if (T === primitives.any || value === null) {
     return true;
   }
@@ -143,6 +149,11 @@ function isType(value, T, errors) {
   // return res;
 }
 
+function _isProxy(obj) {
+  if (!obj || !obj.constructor || !obj.constructor.annotations) return false;
+  return obj.constructor.annotations.filter((a) => a instanceof proxy).length > 0;
+}
+
 function formatErrors(errors, indent = '  ') {
   return errors.map((e) => {
     if (typeof e === 'string') return indent + '- ' + e;