diff --git a/node_modules/c9/ratelimit.js b/node_modules/c9/ratelimit.js
index 4cb15f81..1b045036 100644
--- a/node_modules/c9/ratelimit.js
+++ b/node_modules/c9/ratelimit.js
@@ -30,6 +30,7 @@ function ratelimit(key, duration, max) {
         return true;
     }
     
+    // Returns a deep value from an object. E.g. resolveValue({user: {id: 5}}, "user.id") === 5
     function resolveValue(obj, path) {
         return path.split('.').reduce(function(prev, curr) {
             return prev ? prev[curr] : undefined;
diff --git a/node_modules/c9/ratelimit_test.js b/node_modules/c9/ratelimit_test.js
index 034e5751..7cff5de9 100644
--- a/node_modules/c9/ratelimit_test.js
+++ b/node_modules/c9/ratelimit_test.js
@@ -5,6 +5,7 @@ require("c9/inline-mocha")(module);
 var ratelimit = require("./ratelimit");
 var assert = require("assert");
 var async = require("async");
+var sinon = require("sinon");
 
 describe("ratelimit", function() {
     
@@ -77,37 +78,27 @@ describe("ratelimit", function() {
     });
     
     it("Should expire keys at the correct times", function (done) {
+        var clock = sinon.useFakeTimers();
         var limiter = ratelimit("username", 50, 2);
-        async.series([
-            function(next) {    
-                limiter({params: {username: "mario"}}, null, function(err) {
-                    assert(!err, err);
-                    setTimeout(next, 40);
-                });
-            },
-            function (next) {
-                limiter({params: {username: "mario"}}, null, function(err) {
-                    assert(!err, err);
-                    setTimeout(next, 45);
-                });
-            },
-            function (next) {
-                limiter({params: {username: "mario"}}, null, function(err) {
-                    assert(!err, err);
-                    limiter({params: {username: "mario"}}, null, function(err) {
-                        assert(err);
-                        assert.equal(err.code, 429);
-                        setTimeout(next, 40);
-                    });
-                });
-            },
-            function (next) {
-                limiter({params: {username: "mario"}}, null, function(err) {
-                    assert(!err, err);
-                    next();
-                });
-            }
-        ], done);
+        limiter({params: {username: "mario"}}, null, function(err){
+            assert(!err, err);
+        });
+        clock.tick(40);
+        limiter({params: {username: "mario"}}, null, function(err){
+            assert(!err, err);
+        });
+        clock.tick(45);
+        limiter({params: {username: "mario"}}, null, function(err){
+            assert(!err, err);
+        });
+        limiter({params: {username: "mario"}}, null, function(err){
+            assert(err);
+            assert.equal(err.code, 429);
+        });
+        clock.tick(40);
+        limiter({params: {username: "mario"}}, null, function(err){
+            assert(!err, err);
+        });
+        done();
     });
-    
 });
\ No newline at end of file