prompt: We are currently solving the following issue within our repository. Here is the issue text:
  --- BEGIN ISSUE ---
  scrapy check command ignores contracts with the same URL
  ### Description
  When testing callbacks with the same URL, only one callback is tested.
  
  ### Reproduce
  ```python
  class DemoSpider(Spider):
      name = 'demo_spider'
  
      def returns_item_with_url(self, response):
          """ method which returns request
          @url http://scrapy.org
          @returns items 1 1
          """
          return TestItem(url=response.url)
  
      def returns_item_with_name(self, response):
          """ method which returns request
          @url http://scrapy.org
          @returns items 1 1
          """
          return TestItem(name='scrapy')
  ```
  
  Then run `scrapy check`.
  
  You'll get the following output:
  
  ```
  .
  ----------------------------------------------------------------------
  Ran 1 contract in 0.894s
  
  OK
  ```
  
  ### Reason
  This is default behavior for crawlers to filter same URLs.
  
  ### Solution
  Use `dont_filter` in requests returned by `ContractsManager`.
  
  --- END ISSUE ---
  
  Below are some code segments, each from a relevant file. One or more of these files may contain bugs.
  --- BEGIN FILES ---
  Path: `scrapy/contracts/__init__.py`
  Content:
  ```
  1 import sys
  2 import re
  3 from functools import wraps
  4 from inspect import getmembers
  5 from unittest import TestCase
  6 
  7 from scrapy.http import Request
  8 from scrapy.utils.spider import iterate_spider_output
  9 from scrapy.utils.python import get_spec
  10 
  11 
  12 class ContractsManager(object):
  13     contracts = {}
  14 
  15     def __init__(self, contracts):
  16         for contract in contracts:
  17             self.contracts[contract.name] = contract
  18 
  19     def tested_methods_from_spidercls(self, spidercls):
  20         methods = []
  21         for key, value in getmembers(spidercls):
  22             if (callable(value) and value.__doc__ and
  23                     re.search(r'^\s*@', value.__doc__, re.MULTILINE)):
  24                 methods.append(key)
  25 
  26         return methods
  27 
  28     def extract_contracts(self, method):
  29         contracts = []
  30         for line in method.__doc__.split('\n'):
  31             line = line.strip()
  32 
  33             if line.startswith('@'):
  34                 name, args = re.match(r'@(\w+)\s*(.*)', line).groups()
  35                 args = re.split(r'\s+', args)
  36 
  37                 contracts.append(self.contracts[name](method, *args))
  38 
  39         return contracts
  40 
  41     def from_spider(self, spider, results):
  42         requests = []
  43         for method in self.tested_methods_from_spidercls(type(spider)):
  44             bound_method = spider.__getattribute__(method)
  45             requests.append(self.from_method(bound_method, results))
  46 
  47         return requests
  48 
  49     def from_method(self, method, results):
  50         contracts = self.extract_contracts(method)
  51         if contracts:
  52             request_cls = Request
  53             for contract in contracts:
  54                 if contract.request_cls is not None:
  55                     request_cls = contract.request_cls
  56 
  57             # calculate request args
  58             args, kwargs = get_spec(request_cls.__init__)
  59             kwargs['callback'] = method
  60             for contract in contracts:
  61                 kwargs = contract.adjust_request_args(kwargs)
  62 
  63             args.remove('self')
  64 
  65             # check if all positional arguments are defined in kwargs
  66             if set(args).issubset(set(kwargs)):
  67                 request = request_cls(**kwargs)
  68 
  69                 # execute pre and post hooks in order
  70                 for contract in reversed(contracts):
  71                     request = contract.add_pre_hook(request, results)
  72                 for contract in contracts:
  73                     request = contract.add_post_hook(request, results)
  74 
  75                 self._clean_req(request, method, results)
  76                 return request
  77 
  78     def _clean_req(self, request, method, results):
  79         """ stop the request from returning objects and records any errors """
  80 
  81         cb = request.callback
  82 
  83         @wraps(cb)
  84         def cb_wrapper(response):
  85             try:
  86                 output = cb(response)
  87                 output = list(iterate_spider_output(output))
  88             except:
  89                 case = _create_testcase(method, 'callback')
  90                 results.addError(case, sys.exc_info())
  91 
  92         def eb_wrapper(failure):
  93             case = _create_testcase(method, 'errback')
  94             exc_info = failure.type, failure.value, failure.getTracebackObject()
  95             results.addError(case, exc_info)
  96 
  97         request.callback = cb_wrapper
  98         request.errback = eb_wrapper
  99 
  100 
  101 class Contract(object):
  102     """ Abstract class for contracts """
  103     request_cls = None
  104 
  105     def __init__(self, method, *args):
  106         self.testcase_pre = _create_testcase(method, '@%s pre-hook' % self.name)
  107         self.testcase_post = _create_testcase(method, '@%s post-hook' % self.name)
  108         self.args = args
  109 
  110     def add_pre_hook(self, request, results):
  111         if hasattr(self, 'pre_process'):
  112             cb = request.callback
  113 
  114             @wraps(cb)
  115             def wrapper(response):
  116                 try:
  117                     results.startTest(self.testcase_pre)
  118                     self.pre_process(response)
  119                     results.stopTest(self.testcase_pre)
  120                 except AssertionError:
  121                     results.addFailure(self.testcase_pre, sys.exc_info())
  122                 except Exception:
  123                     results.addError(self.testcase_pre, sys.exc_info())
  124                 else:
  125                     results.addSuccess(self.testcase_pre)
  126                 finally:
  127                     return list(iterate_spider_output(cb(response)))
  128 
  129             request.callback = wrapper
  130 
  131         return request
  132 
  133     def add_post_hook(self, request, results):
  134         if hasattr(self, 'post_process'):
  135             cb = request.callback
  136 
  137             @wraps(cb)
  138             def wrapper(response):
  139                 output = list(iterate_spider_output(cb(response)))
  140                 try:
  141                     results.startTest(self.testcase_post)
  142                     self.post_process(output)
  143                     results.stopTest(self.testcase_post)
  144                 except AssertionError:
  145                     results.addFailure(self.testcase_post, sys.exc_info())
  146                 except Exception:
  147                     results.addError(self.testcase_post, sys.exc_info())
  148                 else:
  149                     results.addSuccess(self.testcase_post)
  150                 finally:
  151                     return output
  152 
  153             request.callback = wrapper
  154 
  155         return request
  156 
  157     def adjust_request_args(self, args):
  158         return args
  159 
  160 
  161 def _create_testcase(method, desc):
  162     spider = method.__self__.name
  163 
  164     class ContractTestCase(TestCase):
  165         def __str__(_self):
  166             return "[%s] %s (%s)" % (spider, method.__name__, desc)
  167 
  168     name = '%s_%s' % (spider, method.__name__)
  169     setattr(ContractTestCase, name, lambda x: x)
  170     return ContractTestCase(name)
  171
  ```
  --- END FILES ---
  
  Please first localize the bug based on the issue statement, and then generate a patch according to the `git diff` format fenced by three backticks.
  
  Here is an example:
  
  ```diff
  diff --git a/examples/server_async.py b/examples/server_async.py
  --- a/examples/server_async.py
  +++ b/examples/server_async.py
  @@ -313,4 +313,4 @@
   
   
   if __name__ == "__main__":
  -    asyncio.run(run_async_server("."), debug=True)
  +    asyncio.run(run_async_server(), debug=True)
  diff --git a/examples/server_sync.py b/examples/server_sync.py
  --- a/examples/server_sync.py
  +++ b/examples/server_sync.py
  @@ -313,5 +313,5 @@
   
   
   if __name__ == "__main__":
  -    server = run_sync_server(".")
  +    server = run_sync_server()
       server.shutdown()
  
  ```
  
golden_diff: diff --git a/scrapy/contracts/__init__.py b/scrapy/contracts/__init__.py
  --- a/scrapy/contracts/__init__.py
  +++ b/scrapy/contracts/__init__.py
  @@ -56,7 +56,12 @@
   
               # calculate request args
               args, kwargs = get_spec(request_cls.__init__)
  +
  +            # Don't filter requests to allow
  +            # testing different callbacks on the same URL.
  +            kwargs['dont_filter'] = True
               kwargs['callback'] = method
  +
               for contract in contracts:
                   kwargs = contract.adjust_request_args(kwargs)
  
verification_info: {"golden_diff": "diff --git a/scrapy/contracts/__init__.py b/scrapy/contracts/__init__.py\n--- a/scrapy/contracts/__init__.py\n+++ b/scrapy/contracts/__init__.py\n@@ -56,7 +56,12 @@\n \n             # calculate request args\n             args, kwargs = get_spec(request_cls.__init__)\n+\n+            # Don't filter requests to allow\n+            # testing different callbacks on the same URL.\n+            kwargs['dont_filter'] = True\n             kwargs['callback'] = method\n+\n             for contract in contracts:\n                 kwargs = contract.adjust_request_args(kwargs)\n", "issue": "scrapy check command ignores contracts with the same URL\n### Description\r\nWhen testing callbacks with the same URL, only one callback is tested.\r\n\r\n### Reproduce\r\n```python\r\nclass DemoSpider(Spider):\r\n    name = 'demo_spider'\r\n\r\n    def returns_item_with_url(self, response):\r\n        \"\"\" method which returns request\r\n        @url http://scrapy.org\r\n        @returns items 1 1\r\n        \"\"\"\r\n        return TestItem(url=response.url)\r\n\r\n    def returns_item_with_name(self, response):\r\n        \"\"\" method which returns request\r\n        @url http://scrapy.org\r\n        @returns items 1 1\r\n        \"\"\"\r\n        return TestItem(name='scrapy')\r\n```\r\n\r\nThen run `scrapy check`.\r\n\r\nYou'll get the following output:\r\n\r\n```\r\n.\r\n----------------------------------------------------------------------\r\nRan 1 contract in 0.894s\r\n\r\nOK\r\n```\r\n\r\n### Reason\r\nThis is default behavior for crawlers to filter same URLs.\r\n\r\n### Solution\r\nUse `dont_filter` in requests returned by `ContractsManager`.\n", "before_files": [{"content": "import sys\nimport re\nfrom functools import wraps\nfrom inspect import getmembers\nfrom unittest import TestCase\n\nfrom scrapy.http import Request\nfrom scrapy.utils.spider import iterate_spider_output\nfrom scrapy.utils.python import get_spec\n\n\nclass ContractsManager(object):\n    contracts = {}\n\n    def __init__(self, contracts):\n        for contract in contracts:\n            self.contracts[contract.name] = contract\n\n    def tested_methods_from_spidercls(self, spidercls):\n        methods = []\n        for key, value in getmembers(spidercls):\n            if (callable(value) and value.__doc__ and\n                    re.search(r'^\\s*@', value.__doc__, re.MULTILINE)):\n                methods.append(key)\n\n        return methods\n\n    def extract_contracts(self, method):\n        contracts = []\n        for line in method.__doc__.split('\\n'):\n            line = line.strip()\n\n            if line.startswith('@'):\n                name, args = re.match(r'@(\\w+)\\s*(.*)', line).groups()\n                args = re.split(r'\\s+', args)\n\n                contracts.append(self.contracts[name](method, *args))\n\n        return contracts\n\n    def from_spider(self, spider, results):\n        requests = []\n        for method in self.tested_methods_from_spidercls(type(spider)):\n            bound_method = spider.__getattribute__(method)\n            requests.append(self.from_method(bound_method, results))\n\n        return requests\n\n    def from_method(self, method, results):\n        contracts = self.extract_contracts(method)\n        if contracts:\n            request_cls = Request\n            for contract in contracts:\n                if contract.request_cls is not None:\n                    request_cls = contract.request_cls\n\n            # calculate request args\n            args, kwargs = get_spec(request_cls.__init__)\n            kwargs['callback'] = method\n            for contract in contracts:\n                kwargs = contract.adjust_request_args(kwargs)\n\n            args.remove('self')\n\n            # check if all positional arguments are defined in kwargs\n            if set(args).issubset(set(kwargs)):\n                request = request_cls(**kwargs)\n\n                # execute pre and post hooks in order\n                for contract in reversed(contracts):\n                    request = contract.add_pre_hook(request, results)\n                for contract in contracts:\n                    request = contract.add_post_hook(request, results)\n\n                self._clean_req(request, method, results)\n                return request\n\n    def _clean_req(self, request, method, results):\n        \"\"\" stop the request from returning objects and records any errors \"\"\"\n\n        cb = request.callback\n\n        @wraps(cb)\n        def cb_wrapper(response):\n            try:\n                output = cb(response)\n                output = list(iterate_spider_output(output))\n            except:\n                case = _create_testcase(method, 'callback')\n                results.addError(case, sys.exc_info())\n\n        def eb_wrapper(failure):\n            case = _create_testcase(method, 'errback')\n            exc_info = failure.type, failure.value, failure.getTracebackObject()\n            results.addError(case, exc_info)\n\n        request.callback = cb_wrapper\n        request.errback = eb_wrapper\n\n\nclass Contract(object):\n    \"\"\" Abstract class for contracts \"\"\"\n    request_cls = None\n\n    def __init__(self, method, *args):\n        self.testcase_pre = _create_testcase(method, '@%s pre-hook' % self.name)\n        self.testcase_post = _create_testcase(method, '@%s post-hook' % self.name)\n        self.args = args\n\n    def add_pre_hook(self, request, results):\n        if hasattr(self, 'pre_process'):\n            cb = request.callback\n\n            @wraps(cb)\n            def wrapper(response):\n                try:\n                    results.startTest(self.testcase_pre)\n                    self.pre_process(response)\n                    results.stopTest(self.testcase_pre)\n                except AssertionError:\n                    results.addFailure(self.testcase_pre, sys.exc_info())\n                except Exception:\n                    results.addError(self.testcase_pre, sys.exc_info())\n                else:\n                    results.addSuccess(self.testcase_pre)\n                finally:\n                    return list(iterate_spider_output(cb(response)))\n\n            request.callback = wrapper\n\n        return request\n\n    def add_post_hook(self, request, results):\n        if hasattr(self, 'post_process'):\n            cb = request.callback\n\n            @wraps(cb)\n            def wrapper(response):\n                output = list(iterate_spider_output(cb(response)))\n                try:\n                    results.startTest(self.testcase_post)\n                    self.post_process(output)\n                    results.stopTest(self.testcase_post)\n                except AssertionError:\n                    results.addFailure(self.testcase_post, sys.exc_info())\n                except Exception:\n                    results.addError(self.testcase_post, sys.exc_info())\n                else:\n                    results.addSuccess(self.testcase_post)\n                finally:\n                    return output\n\n            request.callback = wrapper\n\n        return request\n\n    def adjust_request_args(self, args):\n        return args\n\n\ndef _create_testcase(method, desc):\n    spider = method.__self__.name\n\n    class ContractTestCase(TestCase):\n        def __str__(_self):\n            return \"[%s] %s (%s)\" % (spider, method.__name__, desc)\n\n    name = '%s_%s' % (spider, method.__name__)\n    setattr(ContractTestCase, name, lambda x: x)\n    return ContractTestCase(name)\n", "path": "scrapy/contracts/__init__.py"}], "after_files": [{"content": "import sys\nimport re\nfrom functools import wraps\nfrom inspect import getmembers\nfrom unittest import TestCase\n\nfrom scrapy.http import Request\nfrom scrapy.utils.spider import iterate_spider_output\nfrom scrapy.utils.python import get_spec\n\n\nclass ContractsManager(object):\n    contracts = {}\n\n    def __init__(self, contracts):\n        for contract in contracts:\n            self.contracts[contract.name] = contract\n\n    def tested_methods_from_spidercls(self, spidercls):\n        methods = []\n        for key, value in getmembers(spidercls):\n            if (callable(value) and value.__doc__ and\n                    re.search(r'^\\s*@', value.__doc__, re.MULTILINE)):\n                methods.append(key)\n\n        return methods\n\n    def extract_contracts(self, method):\n        contracts = []\n        for line in method.__doc__.split('\\n'):\n            line = line.strip()\n\n            if line.startswith('@'):\n                name, args = re.match(r'@(\\w+)\\s*(.*)', line).groups()\n                args = re.split(r'\\s+', args)\n\n                contracts.append(self.contracts[name](method, *args))\n\n        return contracts\n\n    def from_spider(self, spider, results):\n        requests = []\n        for method in self.tested_methods_from_spidercls(type(spider)):\n            bound_method = spider.__getattribute__(method)\n            requests.append(self.from_method(bound_method, results))\n\n        return requests\n\n    def from_method(self, method, results):\n        contracts = self.extract_contracts(method)\n        if contracts:\n            request_cls = Request\n            for contract in contracts:\n                if contract.request_cls is not None:\n                    request_cls = contract.request_cls\n\n            # calculate request args\n            args, kwargs = get_spec(request_cls.__init__)\n\n            # Don't filter requests to allow\n            # testing different callbacks on the same URL.\n            kwargs['dont_filter'] = True\n            kwargs['callback'] = method\n\n            for contract in contracts:\n                kwargs = contract.adjust_request_args(kwargs)\n\n            args.remove('self')\n\n            # check if all positional arguments are defined in kwargs\n            if set(args).issubset(set(kwargs)):\n                request = request_cls(**kwargs)\n\n                # execute pre and post hooks in order\n                for contract in reversed(contracts):\n                    request = contract.add_pre_hook(request, results)\n                for contract in contracts:\n                    request = contract.add_post_hook(request, results)\n\n                self._clean_req(request, method, results)\n                return request\n\n    def _clean_req(self, request, method, results):\n        \"\"\" stop the request from returning objects and records any errors \"\"\"\n\n        cb = request.callback\n\n        @wraps(cb)\n        def cb_wrapper(response):\n            try:\n                output = cb(response)\n                output = list(iterate_spider_output(output))\n            except:\n                case = _create_testcase(method, 'callback')\n                results.addError(case, sys.exc_info())\n\n        def eb_wrapper(failure):\n            case = _create_testcase(method, 'errback')\n            exc_info = failure.type, failure.value, failure.getTracebackObject()\n            results.addError(case, exc_info)\n\n        request.callback = cb_wrapper\n        request.errback = eb_wrapper\n\n\nclass Contract(object):\n    \"\"\" Abstract class for contracts \"\"\"\n    request_cls = None\n\n    def __init__(self, method, *args):\n        self.testcase_pre = _create_testcase(method, '@%s pre-hook' % self.name)\n        self.testcase_post = _create_testcase(method, '@%s post-hook' % self.name)\n        self.args = args\n\n    def add_pre_hook(self, request, results):\n        if hasattr(self, 'pre_process'):\n            cb = request.callback\n\n            @wraps(cb)\n            def wrapper(response):\n                try:\n                    results.startTest(self.testcase_pre)\n                    self.pre_process(response)\n                    results.stopTest(self.testcase_pre)\n                except AssertionError:\n                    results.addFailure(self.testcase_pre, sys.exc_info())\n                except Exception:\n                    results.addError(self.testcase_pre, sys.exc_info())\n                else:\n                    results.addSuccess(self.testcase_pre)\n                finally:\n                    return list(iterate_spider_output(cb(response)))\n\n            request.callback = wrapper\n\n        return request\n\n    def add_post_hook(self, request, results):\n        if hasattr(self, 'post_process'):\n            cb = request.callback\n\n            @wraps(cb)\n            def wrapper(response):\n                output = list(iterate_spider_output(cb(response)))\n                try:\n                    results.startTest(self.testcase_post)\n                    self.post_process(output)\n                    results.stopTest(self.testcase_post)\n                except AssertionError:\n                    results.addFailure(self.testcase_post, sys.exc_info())\n                except Exception:\n                    results.addError(self.testcase_post, sys.exc_info())\n                else:\n                    results.addSuccess(self.testcase_post)\n                finally:\n                    return output\n\n            request.callback = wrapper\n\n        return request\n\n    def adjust_request_args(self, args):\n        return args\n\n\ndef _create_testcase(method, desc):\n    spider = method.__self__.name\n\n    class ContractTestCase(TestCase):\n        def __str__(_self):\n            return \"[%s] %s (%s)\" % (spider, method.__name__, desc)\n\n    name = '%s_%s' % (spider, method.__name__)\n    setattr(ContractTestCase, name, lambda x: x)\n    return ContractTestCase(name)\n", "path": "scrapy/contracts/__init__.py"}]}