diff --git a/scrapy/contracts/__init__.py b/scrapy/contracts/__init__.py
index 536bbdafb..b3f02a291 100644
--- a/scrapy/contracts/__init__.py
+++ b/scrapy/contracts/__init__.py
@@ -92,7 +92,7 @@ class ContractsManager(object):
         @wraps(cb)
         def cb_wrapper(response):
             try:
-                output = cb(response)
+                output = cb(response, **request.cb_kwargs)
                 output = list(iterate_spider_output(output))
             except Exception:
                 case = _create_testcase(method, 'callback')
@@ -133,7 +133,7 @@ class Contract(object):
                 else:
                     results.addSuccess(self.testcase_pre)
                 finally:
-                    return list(iterate_spider_output(cb(response)))
+                    return list(iterate_spider_output(cb(response, **request.cb_kwargs)))
 
             request.callback = wrapper
 
@@ -145,7 +145,7 @@ class Contract(object):
 
             @wraps(cb)
             def wrapper(response):
-                output = list(iterate_spider_output(cb(response)))
+                output = list(iterate_spider_output(cb(response, **request.cb_kwargs)))
                 try:
                     results.startTest(self.testcase_post)
                     self.post_process(output)
diff --git a/scrapy/contracts/default.py b/scrapy/contracts/default.py
index 7745959a7..24f6c2e77 100644
--- a/scrapy/contracts/default.py
+++ b/scrapy/contracts/default.py
@@ -1,3 +1,5 @@
+import json
+
 from scrapy.item import BaseItem
 from scrapy.http import Request
 from scrapy.exceptions import ContractFail
@@ -18,6 +20,20 @@ class UrlContract(Contract):
         return args
 
 
+class CallbackKeywordArgumentsContract(Contract):
+    """ Contract to set the keyword arguments for the request.
+        The value should be a JSON-encoded dictionary, e.g.:
+
+        @cb_kwargs {"arg1": "some value"}
+    """
+
+    name = 'cb_kwargs'
+
+    def adjust_request_args(self, args):
+        args['cb_kwargs'] = json.loads(' '.join(self.args))
+        return args
+
+
 class ReturnsContract(Contract):
     """ Contract to check the output of a callback
 
diff --git a/scrapy/settings/default_settings.py b/scrapy/settings/default_settings.py
index 5884dfc60..52a701edf 100644
--- a/scrapy/settings/default_settings.py
+++ b/scrapy/settings/default_settings.py
@@ -291,6 +291,7 @@ TELNETCONSOLE_PASSWORD = None
 SPIDER_CONTRACTS = {}
 SPIDER_CONTRACTS_BASE = {
     'scrapy.contracts.default.UrlContract': 1,
-    'scrapy.contracts.default.ReturnsContract': 2,
-    'scrapy.contracts.default.ScrapesContract': 3,
+    'scrapy.contracts.default.CallbackKeywordArgumentsContract': 2,
+    'scrapy.contracts.default.ReturnsContract': 3,
+    'scrapy.contracts.default.ScrapesContract': 4,
 }