diff --git a/lib/mock-ajax.js b/lib/mock-ajax.js
index 8667d0a..19fda97 100644
--- a/lib/mock-ajax.js
+++ b/lib/mock-ajax.js
@@ -44,7 +44,7 @@ WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
     }
 }(typeof window !== 'undefined' ? window : global, function (global, getJasmineRequireObj) {
 
-// 
+//
 getJasmineRequireObj().ajax = function(jRequire) {
   var $ajax = {};
 
@@ -284,6 +284,14 @@ getJasmineRequireObj().AjaxFakeRequest = function(eventBusFactory) {
       return null;
     }
 
+    extend(FakeXMLHttpRequest, {
+        UNSENT: 0,
+        OPENED: 1,
+        HEADERS_RECEIVED: 2,
+        LOADING: 3,
+        DONE: 4
+    });
+
     var iePropertiesThatCannotBeCopied = ['responseBody', 'responseText', 'responseXML', 'status', 'statusText', 'responseTimeout', 'responseURL'];
     extend(FakeXMLHttpRequest.prototype, new global.XMLHttpRequest(), iePropertiesThatCannotBeCopied);
     extend(FakeXMLHttpRequest.prototype, {
@@ -292,7 +300,7 @@ getJasmineRequireObj().AjaxFakeRequest = function(eventBusFactory) {
         this.url = arguments[1];
         this.username = arguments[3];
         this.password = arguments[4];
-        this.readyState = 1;
+        this.readyState = FakeXMLHttpRequest.OPENED;
         this.requestHeaders = {};
         this.eventBus.trigger('readystatechange');
       },
@@ -310,7 +318,7 @@ getJasmineRequireObj().AjaxFakeRequest = function(eventBusFactory) {
       },
 
       abort: function() {
-        this.readyState = 0;
+        this.readyState = FakeXMLHttpRequest.UNSENT;
         this.status = 0;
         this.statusText = "abort";
         this.eventBus.trigger('readystatechange');
@@ -319,7 +327,7 @@ getJasmineRequireObj().AjaxFakeRequest = function(eventBusFactory) {
         this.eventBus.trigger('loadend');
       },
 
-      readyState: 0,
+      readyState: FakeXMLHttpRequest.UNSENT,
 
       onloadstart: null,
       onprogress: null,
@@ -403,7 +411,7 @@ getJasmineRequireObj().AjaxFakeRequest = function(eventBusFactory) {
           case null:
           case "":
           case "text":
-            return this.readyState >= 3 ? this.responseText : "";
+            return this.readyState >= FakeXMLHttpRequest.LOADING ? this.responseText : "";
           case "json":
             return JSON.parse(this.responseText);
           case "arraybuffer":
@@ -417,20 +425,20 @@ getJasmineRequireObj().AjaxFakeRequest = function(eventBusFactory) {
 
 
       respondWith: function(response) {
-        if (this.readyState === 4) {
+        if (this.readyState === FakeXMLHttpRequest.DONE) {
           throw new Error("FakeXMLHttpRequest already completed");
         }
 
         this.status = response.status;
         this.statusText = response.statusText || "";
         this.responseHeaders = normalizeHeaders(response.responseHeaders, response.contentType);
-        this.readyState = 2;
+        this.readyState = FakeXMLHttpRequest.HEADERS_RECEIVED;
         this.eventBus.trigger('readystatechange');
 
         this.responseText = response.responseText || "";
         this.responseType = response.responseType || "";
         this.responseURL = response.responseURL || null;
-        this.readyState = 4;
+        this.readyState = FakeXMLHttpRequest.DONE;
         this.responseXML = getResponseXml(response.responseText, this.getResponseHeader('content-type') || '');
         if (this.responseXML) {
           this.responseType = 'document';
@@ -449,10 +457,10 @@ getJasmineRequireObj().AjaxFakeRequest = function(eventBusFactory) {
       },
 
       responseTimeout: function() {
-        if (this.readyState === 4) {
+        if (this.readyState === FakeXMLHttpRequest.DONE) {
           throw new Error("FakeXMLHttpRequest already completed");
         }
-        this.readyState = 4;
+        this.readyState = FakeXMLHttpRequest.DONE;
         jasmine.clock().tick(30000);
         this.eventBus.trigger('readystatechange');
         this.eventBus.trigger('progress');
@@ -461,10 +469,10 @@ getJasmineRequireObj().AjaxFakeRequest = function(eventBusFactory) {
       },
 
       responseError: function() {
-        if (this.readyState === 4) {
+        if (this.readyState === FakeXMLHttpRequest.DONE) {
           throw new Error("FakeXMLHttpRequest already completed");
         }
-        this.readyState = 4;
+        this.readyState = FakeXMLHttpRequest.DONE;
         this.eventBus.trigger('readystatechange');
         this.eventBus.trigger('progress');
         this.eventBus.trigger('error');
diff --git a/spec/fakeRequestSpec.js b/spec/fakeRequestSpec.js
index 5243d7e..bf90728 100644
--- a/spec/fakeRequestSpec.js
+++ b/spec/fakeRequestSpec.js
@@ -117,19 +117,39 @@ describe('FakeRequest', function() {
       this.request = new this.FakeRequest();
     });
 
-    it('has an initial ready state of 0 (uninitialized)', function() {
+    it('has a static state UNSENT', function () {
+        expect(this.FakeRequest.UNSENT).toBe(0);
+    });
+
+    it('has a static state OPENED', function () {
+        expect(this.FakeRequest.OPENED).toBe(1);
+    });
+
+    it('has a static state HEADERS_RECEIVED', function () {
+        expect(this.FakeRequest.HEADERS_RECEIVED).toBe(2);
+    });
+
+    it('has a static state LOADING', function () {
+        expect(this.FakeRequest.LOADING).toBe(3);
+    });
+
+    it('has a static state DONE', function () {
+        expect(this.FakeRequest.DONE).toBe(4);
+    });
+
+    it('has an initial ready state of 0 (unsent)', function() {
       expect(this.request.readyState).toBe(0);
       expect(this.fakeEventBus.trigger).not.toHaveBeenCalled();
     });
 
-    it('has a ready state of 1 (open) when opened', function() {
+    it('has a ready state of 1 (opened) when opened', function() {
       this.request.open();
 
       expect(this.request.readyState).toBe(1);
       expect(this.fakeEventBus.trigger).toHaveBeenCalledWith('readystatechange');
     });
 
-    it('has a ready state of 0 (uninitialized) when aborted', function() {
+    it('has a ready state of 0 (unsent) when aborted', function() {
       this.request.open();
       this.fakeEventBus.trigger.calls.reset();
 
@@ -139,7 +159,7 @@ describe('FakeRequest', function() {
       expect(this.fakeEventBus.trigger).toHaveBeenCalledWith('readystatechange');
     });
 
-    it('has a ready state of 1 (sent) when sent', function() {
+    it('has a ready state of 1 (opened) when sent', function() {
       this.request.open();
       this.fakeEventBus.trigger.calls.reset();
 
@@ -150,7 +170,7 @@ describe('FakeRequest', function() {
       expect(this.fakeEventBus.trigger).not.toHaveBeenCalledWith('readystatechange');
     });
 
-    it('has a ready state of 4 (loaded) when timed out', function() {
+    it('has a ready state of 4 (done) when timed out', function() {
       this.request.open();
       this.request.send();
       this.fakeEventBus.trigger.calls.reset();
@@ -163,7 +183,7 @@ describe('FakeRequest', function() {
       expect(this.fakeEventBus.trigger).toHaveBeenCalledWith('readystatechange');
     });
 
-    it('has a ready state of 4 (loaded) when network erroring', function() {
+    it('has a ready state of 4 (done) when network erroring', function() {
       this.request.open();
       this.request.send();
       this.fakeEventBus.trigger.calls.reset();
@@ -174,7 +194,7 @@ describe('FakeRequest', function() {
       expect(this.fakeEventBus.trigger).toHaveBeenCalledWith('readystatechange');
     });
 
-    it('has a ready state of 4 (loaded) when responding', function() {
+    it('has a ready state of 4 (done) when responding', function() {
       this.request.open();
       this.request.send();
       this.fakeEventBus.trigger.calls.reset();
@@ -185,7 +205,7 @@ describe('FakeRequest', function() {
       expect(this.fakeEventBus.trigger).toHaveBeenCalledWith('readystatechange');
     });
 
-    it('has a ready state of 2, then 4 (loaded) when responding', function() {
+    it('has a ready state of 2, then 4 (done) when responding', function() {
       this.request.open();
       this.request.send();
       this.fakeEventBus.trigger.calls.reset();