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diff --git a/dom/tests/mochitest/ajax/prototype/test/unit/ajax_test.js b/dom/tests/mochitest/ajax/prototype/test/unit/ajax_test.js
new file mode 100644
index 0000000000..9ceb985186
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+++ b/dom/tests/mochitest/ajax/prototype/test/unit/ajax_test.js
@@ -0,0 +1,286 @@
+var extendDefault = function(options) {
+  return Object.extend({
+    asynchronous: false,
+    method: 'get',
+    onException: function(request, e) { throw e }
+  }, options);
+};
+
+new Test.Unit.Runner({
+  setup: function() {
+    $('content').update('');
+    $('content2').update('');
+  },
+  
+  teardown: function() {
+    // hack to cleanup responders
+    Ajax.Responders.responders = [Ajax.Responders.responders[0]];
+  },
+  
+  testSynchronousRequest: function() {
+    this.assertEqual("", $("content").innerHTML);
+    
+    this.assertEqual(0, Ajax.activeRequestCount);
+    new Ajax.Request("../fixtures/hello.js", extendDefault({
+      asynchronous: false,
+      method: 'GET',
+      evalJS: 'force'
+    }));
+    this.assertEqual(0, Ajax.activeRequestCount);
+    
+    var h2 = $("content").firstChild;
+    this.assertEqual("Hello world!", h2.innerHTML);
+  },
+  
+  testUpdaterOptions: function() {
+    var options = {
+      method: 'get',
+      asynchronous: false,
+      evalJS: 'force',
+      onComplete: Prototype.emptyFunction
+    }
+    var request = new Ajax.Updater("content", "../fixtures/hello.js", options);
+    request.options.onComplete = function() {};
+    this.assertIdentical(Prototype.emptyFunction, options.onComplete);
+  },
+  
+  testEvalResponseShouldBeCalledBeforeOnComplete: function() {
+    if (this.isRunningFromRake) {
+      this.assertEqual("", $("content").innerHTML);
+    
+      this.assertEqual(0, Ajax.activeRequestCount);
+      new Ajax.Request("../fixtures/hello.js", extendDefault({
+        onComplete: function(response) { this.assertNotEqual("", $("content").innerHTML) }.bind(this)
+      }));
+      this.assertEqual(0, Ajax.activeRequestCount);
+    
+      var h2 = $("content").firstChild;
+      this.assertEqual("Hello world!", h2.innerHTML);
+    } else {
+      this.info(message);
+    }
+  },
+  
+  testContentTypeSetForSimulatedVerbs: function() {
+    if (this.isRunningFromRake) {
+      new Ajax.Request('/inspect', extendDefault({
+        method: 'put',
+        contentType: 'application/bogus',
+        onComplete: function(response) {
+          this.assertEqual('application/bogus; charset=UTF-8', response.responseJSON.headers['content-type']);
+        }.bind(this)
+      }));
+    } else {
+      this.info(message);
+    }
+  },
+  
+  testOnCreateCallback: function() {
+    new Ajax.Request("../fixtures/content.html", extendDefault({
+      onCreate: function(transport) { this.assertEqual(0, transport.readyState) }.bind(this),
+      onComplete: function(transport) { this.assertNotEqual(0, transport.readyState) }.bind(this)
+    }));
+  },
+  
+  testEvalJS: function() {
+    if (this.isRunningFromRake) {
+      
+      $('content').update();
+      new Ajax.Request("/response", extendDefault({
+        parameters: Fixtures.js,
+        onComplete: function(transport) { 
+          var h2 = $("content").firstChild;
+          this.assertEqual("Hello world!", h2.innerHTML);
+        }.bind(this)
+      }));
+      
+      $('content').update();
+      new Ajax.Request("/response", extendDefault({
+        evalJS: false,
+        parameters: Fixtures.js,
+        onComplete: function(transport) { 
+          this.assertEqual("", $("content").innerHTML);
+        }.bind(this)
+      }));
+    } else {
+      this.info(message);
+    }
+    
+    $('content').update();
+    new Ajax.Request("../fixtures/hello.js", extendDefault({
+      evalJS: 'force',
+      onComplete: function(transport) { 
+        var h2 = $("content").firstChild;
+        this.assertEqual("Hello world!", h2.innerHTML);
+      }.bind(this)
+    }));
+  },
+
+  testCallbacks: function() {
+    var options = extendDefault({
+      onCreate: function(transport) { this.assertInstanceOf(Ajax.Response, transport) }.bind(this)
+    });
+    
+    Ajax.Request.Events.each(function(state){
+      options['on' + state] = options.onCreate;
+    });
+
+    new Ajax.Request("../fixtures/content.html", options);
+  },
+
+  testResponseText: function() {
+    new Ajax.Request("../fixtures/empty.html", extendDefault({
+      onComplete: function(transport) { this.assertEqual('', transport.responseText) }.bind(this)
+    }));
+    
+    new Ajax.Request("../fixtures/content.html", extendDefault({
+      onComplete: function(transport) { this.assertEqual(sentence, transport.responseText.toLowerCase()) }.bind(this)
+    }));
+  },
+  
+  testResponseXML: function() {
+    if (this.isRunningFromRake) {
+      new Ajax.Request("/response", extendDefault({
+        parameters: Fixtures.xml,
+        onComplete: function(transport) { 
+          this.assertEqual('foo', transport.responseXML.getElementsByTagName('name')[0].getAttribute('attr'))
+        }.bind(this)
+      }));
+    } else {
+      this.info(message);
+    }
+  },
+      
+  testResponseJSON: function() {
+    if (this.isRunningFromRake) {
+      new Ajax.Request("/response", extendDefault({
+        parameters: Fixtures.json,
+        onComplete: function(transport) { this.assertEqual(123, transport.responseJSON.test) }.bind(this)
+      }));
+      
+      new Ajax.Request("/response", extendDefault({
+        parameters: {
+          'Content-Length': 0,
+          'Content-Type': 'application/json'
+        },
+        onComplete: function(transport) { this.assertNull(transport.responseJSON) }.bind(this)
+      }));
+      
+      new Ajax.Request("/response", extendDefault({
+        evalJSON: false,
+        parameters: Fixtures.json,
+        onComplete: function(transport) { this.assertNull(transport.responseJSON) }.bind(this)
+      }));
+    
+      new Ajax.Request("/response", extendDefault({
+        parameters: Fixtures.jsonWithoutContentType,
+        onComplete: function(transport) { this.assertNull(transport.responseJSON) }.bind(this)
+      }));
+    
+      new Ajax.Request("/response", extendDefault({
+        sanitizeJSON: true,
+        parameters: Fixtures.invalidJson,
+        onException: function(request, error) {
+          this.assert(error.message.include('Badly formed JSON string'));
+          this.assertInstanceOf(Ajax.Request, request);
+        }.bind(this)
+      }));
+    } else {
+      this.info(message);
+    }
+    
+    new Ajax.Request("../fixtures/data.json", extendDefault({
+      evalJSON: 'force',
+      onComplete: function(transport) { this.assertEqual(123, transport.responseJSON.test) }.bind(this)
+    }));
+  },
+  
+  testHeaderJSON: function() {
+    if (this.isRunningFromRake) {
+      new Ajax.Request("/response", extendDefault({
+        parameters: Fixtures.headerJson,
+        onComplete: function(transport, json) {
+          this.assertEqual('hello #éà', transport.headerJSON.test);
+          this.assertEqual('hello #éà', json.test);
+        }.bind(this)
+      }));
+    
+      new Ajax.Request("/response", extendDefault({
+        onComplete: function(transport, json) { 
+          this.assertNull(transport.headerJSON)
+          this.assertNull(json)
+        }.bind(this)
+      }));
+    } else {
+      this.info(message);
+    }
+  },
+  
+  testGetHeader: function() {
+    if (this.isRunningFromRake) {
+     new Ajax.Request("/response", extendDefault({
+        parameters: { 'X-TEST': 'some value' },
+        onComplete: function(transport) {
+          this.assertEqual('some value', transport.getHeader('X-Test'));
+          this.assertNull(transport.getHeader('X-Inexistant'));
+        }.bind(this)
+      }));
+    } else {
+      this.info(message);
+    }
+  },
+  
+  testParametersCanBeHash: function() {
+    if (this.isRunningFromRake) {
+      new Ajax.Request("/response", extendDefault({
+        parameters: $H({ "one": "two", "three": "four" }),
+        onComplete: function(transport) {
+          this.assertEqual("two", transport.getHeader("one"));
+          this.assertEqual("four", transport.getHeader("three"));
+          this.assertNull(transport.getHeader("toObject"));
+        }.bind(this)
+      }));
+    } else {
+      this.info(message);
+    }
+  },
+  
+  testIsSameOriginMethod: function() {
+    var isSameOrigin = Ajax.Request.prototype.isSameOrigin;
+    this.assert(isSameOrigin.call({ url: '/foo/bar.html' }), '/foo/bar.html');
+    this.assert(isSameOrigin.call({ url: window.location.toString() }), window.location);
+    this.assert(!isSameOrigin.call({ url: 'http://example.com' }), 'http://example.com');
+
+    if (this.isRunningFromRake) {
+      Ajax.Request.prototype.isSameOrigin = function() {
+        return false
+      };
+
+      $("content").update('same origin policy');
+      new Ajax.Request("/response", extendDefault({
+        parameters: Fixtures.js,
+        onComplete: function(transport) { 
+          this.assertEqual("same origin policy", $("content").innerHTML);
+        }.bind(this)
+      }));
+
+      new Ajax.Request("/response", extendDefault({
+        parameters: Fixtures.invalidJson,
+        onException: function(request, error) {
+          this.assert(error.message.include('Badly formed JSON string'));
+        }.bind(this)
+      }));
+
+      new Ajax.Request("/response", extendDefault({
+        parameters: { 'X-JSON': '{});window.attacked = true;({}' },
+        onException: function(request, error) {
+          this.assert(error.message.include('Badly formed JSON string'));
+        }.bind(this)
+      }));
+
+      Ajax.Request.prototype.isSameOrigin = isSameOrigin;
+    } else {
+      this.info(message);
+    }
+  }
+});