Adding responseTime. Closes #60.

lib/methods.js

@@ -40,7 +40,10 @@ exports.request = function (method, url, params) {
 
     var deferred = Q.defer();
     var reqObj = defaultedRequestObj || request;
+    var timer = process.hrtime();
     reqObj(options, function (error, response, body) {
+        var elapsedTime = process.hrtime(timer);
+        var elapsedMilliseconds = (elapsedTime[0] * 1000) + (elapsedTime[1] / 1000000);
 /**
 Chakram Response Object
 @desc Encapsulates the results of a HTTP call into a single object
@@ -50,13 +53,15 @@ Chakram Response Object
 @property {String|Buffer|Object} body - The response body. Typically a JSON object unless the json option has been set to false, in which case will be either a String or Buffer
 @property {Object} jar - A {@link https://github.com/goinstant/tough-cookie tough cookie} jar
 @property {String} url - The request's original URL
+@property {Number} responseTime - The time taken to make the request (including redirects) at millisecond resolution
  */
         deferred.resolve({
             error : error,
             response: response,
             body: body,
             jar: options.jar,
-            url: url
+            url: url,
+            responseTime: elapsedMilliseconds
         });
     });
     return deferred.promise;
@@ -165,4 +170,4 @@ Clears any previously set default options.
  */
 exports.clearRequestDefaults = function () {
   defaultedRequestObj = undefined;
-};
+};

test/core/base.js

@@ -86,6 +86,14 @@ describe("Chakram", function() {
             expect(request).not.to.have.status(400);
             return chakram.wait().then(assertChakramResponseObject);
         });
+
+        it("should record response time", function () {
+            this.timeout(3000);
+            return chakram.get("http://httpbin.org/delay/2")
+            .then(function (obj) {
+                expect(obj.responseTime).to.exist.and.to.be.at.least(2000).and.at.most(3000);
+            });
+        });
     });
 
     describe("Multiple expects", function () {