diff --git a/.travis.yml b/.travis.yml
index 2352ef124..0e77af9fd 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -7,6 +7,8 @@ branches:
     - /^\d\.\d+\.\d+(rc\d+|\.dev\d+)?$/
 matrix:
   include:
+    - env: TOXENV=flake8
+      python: 3.8
     - env: TOXENV=pypy3
       python: 3.5
     - env: TOXENV=py35
@@ -25,13 +27,6 @@ matrix:
       python: 3.6
 install:
   - |
-      if [ "$TOXENV" = "pypy" ]; then
-        export PYPY_VERSION="pypy-6.0.0-linux_x86_64-portable"
-        wget "https://bitbucket.org/squeaky/portable-pypy/downloads/${PYPY_VERSION}.tar.bz2"
-        tar -jxf ${PYPY_VERSION}.tar.bz2
-        virtualenv --python="$PYPY_VERSION/bin/pypy" "$HOME/virtualenvs/$PYPY_VERSION"
-        source "$HOME/virtualenvs/$PYPY_VERSION/bin/activate"
-      fi
       if [ "$TOXENV" = "pypy3" ]; then
         export PYPY_VERSION="pypy3.5-5.9-beta-linux_x86_64-portable"
         wget "https://bitbucket.org/squeaky/portable-pypy/downloads/${PYPY_VERSION}.tar.bz2"
diff --git a/conftest.py b/conftest.py
index 7da4c4976..d54ce155c 100644
--- a/conftest.py
+++ b/conftest.py
@@ -17,3 +17,13 @@ for line in open('tests/ignores.txt'):
 def chdir(tmpdir):
     """Change to pytest-provided temporary directory"""
     tmpdir.chdir()
+
+
+def pytest_collection_modifyitems(session, config, items):
+    # Avoid executing tests when executing `--flake8` flag (pytest-flake8)
+    try:
+        from pytest_flake8 import Flake8Item
+        if config.getoption('--flake8'):
+            items[:] = [item for item in items if isinstance(item, Flake8Item)]
+    except ImportError:
+        pass
diff --git a/extras/scrapy_zsh_completion b/extras/scrapy_zsh_completion
index 86c52c36c..e995947cb 100644
--- a/extras/scrapy_zsh_completion
+++ b/extras/scrapy_zsh_completion
@@ -61,7 +61,7 @@ _scrapy() {
 			'-c[evaluate the code in the shell, print the result and exit]:code:(CODE)'
 			'--no-redirect[do not handle HTTP 3xx status codes and print response as-is]'
 			'--spider[use this spider]:spider:_scrapy_spiders'
-			'::file:_files -g \*.http'
+			'::file:_files -g \*.html'
 			'::URL:_httpie_urls'
 		    )
 		    _scrapy_glb_opts $options
diff --git a/pytest.ini b/pytest.ini
index 73d169601..db5bee228 100644
--- a/pytest.ini
+++ b/pytest.ini
@@ -4,3 +4,251 @@ python_files=test_*.py __init__.py
 python_classes=
 addopts = --doctest-modules --assert=plain
 twisted = 1
+flake8-ignore =
+    # extras
+    extras/qps-bench-server.py E261 E501
+    extras/qpsclient.py E501 E261 E501
+    # scrapy/commands
+    scrapy/commands/__init__.py E128 E501
+    scrapy/commands/check.py F401 E501
+    scrapy/commands/crawl.py E501
+    scrapy/commands/edit.py E501
+    scrapy/commands/fetch.py E401 E302 E501 E128 E502 E731
+    scrapy/commands/genspider.py E128 E501 E502
+    scrapy/commands/list.py E302
+    scrapy/commands/parse.py E128 E501 E731 E226
+    scrapy/commands/runspider.py E501
+    scrapy/commands/settings.py E302 E128
+    scrapy/commands/shell.py E128 E501 E502
+    scrapy/commands/startproject.py E502 E127 E501 E128
+    scrapy/commands/version.py E501 E128
+    scrapy/commands/view.py F401 E302
+    # scrapy/contracts
+    scrapy/contracts/__init__.py E501 W504
+    scrapy/contracts/default.py E502 E128
+    # scrapy/core
+    scrapy/core/engine.py E261 E501 E128 E127 E306 E502
+    scrapy/core/scheduler.py E501
+    scrapy/core/scraper.py E501 E306 E261 E128 W504
+    scrapy/core/spidermw.py E501 E731 E502 E231 E126 E226
+    scrapy/core/downloader/__init__.py F401 E501
+    scrapy/core/downloader/contextfactory.py E501 E128 E126
+    scrapy/core/downloader/middleware.py E501 E502
+    scrapy/core/downloader/tls.py E501 E305 E241
+    scrapy/core/downloader/webclient.py E731 E501 E261 E502 E128 E126 E226
+    scrapy/core/downloader/handlers/__init__.py E501
+    scrapy/core/downloader/handlers/ftp.py E501 E305 E128 E127
+    scrapy/core/downloader/handlers/http.py F401
+    scrapy/core/downloader/handlers/http10.py E501
+    scrapy/core/downloader/handlers/http11.py E501
+    scrapy/core/downloader/handlers/s3.py E501 F401 E502 E128 E126
+    # scrapy/downloadermiddlewares
+    scrapy/downloadermiddlewares/ajaxcrawl.py E302 E501 E226
+    scrapy/downloadermiddlewares/decompression.py E501
+    scrapy/downloadermiddlewares/defaultheaders.py E501
+    scrapy/downloadermiddlewares/httpcache.py E501 E126
+    scrapy/downloadermiddlewares/httpcompression.py E502 E128
+    scrapy/downloadermiddlewares/httpproxy.py E501
+    scrapy/downloadermiddlewares/redirect.py E501 W504
+    scrapy/downloadermiddlewares/retry.py E501 E126
+    scrapy/downloadermiddlewares/robotstxt.py F401 E501
+    scrapy/downloadermiddlewares/stats.py E501
+    # scrapy/extensions
+    scrapy/extensions/closespider.py E501 E502 E128 E123
+    scrapy/extensions/corestats.py E302 E501
+    scrapy/extensions/feedexport.py E128 E501
+    scrapy/extensions/httpcache.py E128 E501 E303 F401
+    scrapy/extensions/memdebug.py E501
+    scrapy/extensions/spiderstate.py E302 E501
+    scrapy/extensions/telnet.py E501 W504
+    scrapy/extensions/throttle.py E501
+    # scrapy/http
+    scrapy/http/__init__.py F401
+    scrapy/http/common.py E501
+    scrapy/http/cookies.py E501
+    scrapy/http/request/__init__.py E501
+    scrapy/http/request/form.py E501 E123
+    scrapy/http/request/json_request.py E501
+    scrapy/http/response/__init__.py E501 E128 W293 W291
+    scrapy/http/response/html.py E302
+    scrapy/http/response/text.py E501 W293 E128 E124
+    scrapy/http/response/xml.py E302
+    # scrapy/linkextractors
+    scrapy/linkextractors/__init__.py E731 E502 E501 E402 F401
+    scrapy/linkextractors/lxmlhtml.py E501 E731 E226
+    # scrapy/loader
+    scrapy/loader/__init__.py E501 E502 E128
+    scrapy/loader/common.py E302
+    scrapy/loader/processors.py E501
+    # scrapy/pipelines
+    scrapy/pipelines/__init__.py E302
+    scrapy/pipelines/files.py E116 E501 E266
+    scrapy/pipelines/images.py E265 E501
+    scrapy/pipelines/media.py E125 E501 E266
+    # scrapy/selector
+    scrapy/selector/__init__.py F403 F401
+    scrapy/selector/unified.py F401 E501 E111
+    # scrapy/settings
+    scrapy/settings/__init__.py E501
+    scrapy/settings/default_settings.py E501 E261 E114 E116 E226
+    scrapy/settings/deprecated.py E501
+    # scrapy/spidermiddlewares
+    scrapy/spidermiddlewares/httperror.py E501
+    scrapy/spidermiddlewares/offsite.py E501
+    scrapy/spidermiddlewares/referer.py F401 E501 E129 W503 W504
+    scrapy/spidermiddlewares/urllength.py E501
+    # scrapy/spiders
+    scrapy/spiders/__init__.py F401 E501 E402
+    scrapy/spiders/crawl.py E501
+    scrapy/spiders/feed.py E501 E261
+    scrapy/spiders/sitemap.py E501
+    # scrapy/utils
+    scrapy/utils/benchserver.py E501
+    scrapy/utils/boto.py F401
+    scrapy/utils/conf.py E402 E502 E501
+    scrapy/utils/console.py E302 E261 F401 E306 E305
+    scrapy/utils/curl.py F401
+    scrapy/utils/datatypes.py E501 E226
+    scrapy/utils/decorators.py E501 E302
+    scrapy/utils/defer.py E501 E302 E128
+    scrapy/utils/deprecate.py E128 E501 E127 E502
+    scrapy/utils/display.py E302
+    scrapy/utils/engine.py F401 E261 E302
+    scrapy/utils/ftp.py E302
+    scrapy/utils/gz.py E305 E501 E302 W504
+    scrapy/utils/http.py F403 F401 E226
+    scrapy/utils/httpobj.py E302 E501
+    scrapy/utils/iterators.py E501 E701
+    scrapy/utils/job.py E302
+    scrapy/utils/log.py E128 W503
+    scrapy/utils/markup.py F403 F401 W292
+    scrapy/utils/misc.py E501 E226
+    scrapy/utils/multipart.py F403 F401 W292
+    scrapy/utils/project.py E501
+    scrapy/utils/python.py E501 E302
+    scrapy/utils/reactor.py E302 E226
+    scrapy/utils/reqser.py E501
+    scrapy/utils/request.py E302 E127 E501
+    scrapy/utils/response.py E501 E302 E128
+    scrapy/utils/signal.py E501 E128
+    scrapy/utils/sitemap.py E501
+    scrapy/utils/spider.py E271 E302 E501
+    scrapy/utils/ssl.py E501
+    scrapy/utils/template.py E302
+    scrapy/utils/test.py E302 E501
+    scrapy/utils/url.py E501 F403 F401 E128 F405
+    # scrapy
+    scrapy/__init__.py E402 E501
+    scrapy/_monkeypatches.py W293
+    scrapy/cmdline.py E502 E501
+    scrapy/crawler.py E501
+    scrapy/dupefilters.py E302 E501 E202
+    scrapy/exceptions.py E302 E501
+    scrapy/exporters.py E501 E261 E226
+    scrapy/extension.py E302
+    scrapy/interfaces.py E302 E501
+    scrapy/item.py E501 E128
+    scrapy/link.py E501
+    scrapy/logformatter.py E501 W293
+    scrapy/mail.py E402 E128 E501 E502
+    scrapy/middleware.py E502 E128 E501
+    scrapy/pqueues.py E501
+    scrapy/resolver.py E302
+    scrapy/responsetypes.py E128 E501 E305
+    scrapy/robotstxt.py E302 E501
+    scrapy/shell.py E501
+    scrapy/signalmanager.py E501
+    scrapy/spiderloader.py E225 F841 E501 E126
+    scrapy/squeues.py E128
+    scrapy/statscollectors.py E501
+    # tests
+    tests/__init__.py F401 E402 E501
+    tests/mockserver.py E401 E501 E126 E123 F401
+    tests/pipelines.py E302 F841 E226
+    tests/spiders.py E302 E501 E127
+    tests/test_closespider.py E501 E127
+    tests/test_command_fetch.py E501 E261
+    tests/test_command_parse.py F401 E302 E501 E128 E303 E226
+    tests/test_command_shell.py E501 E128
+    tests/test_commands.py F401 E128 E501
+    tests/test_contracts.py E501 E128 W293
+    tests/test_crawl.py E501 E741 E265
+    tests/test_crawler.py F841 E306 E501
+    tests/test_dependencies.py E302 F841 E501 E305
+    tests/test_downloader_handlers.py E124 E127 E128 E225 E261 E265 F401 E501 E502 E701 E711 E126 E226 E123
+    tests/test_downloadermiddleware.py E501
+    tests/test_downloadermiddleware_ajaxcrawlable.py E302 E501
+    tests/test_downloadermiddleware_cookies.py E731 E741 E501 E128 E303 E265 E126
+    tests/test_downloadermiddleware_decompression.py E127
+    tests/test_downloadermiddleware_defaultheaders.py E501
+    tests/test_downloadermiddleware_downloadtimeout.py E501
+    tests/test_downloadermiddleware_httpcache.py E713 E501 E302 E305 F401
+    tests/test_downloadermiddleware_httpcompression.py E501 F401 E251 E126 E123
+    tests/test_downloadermiddleware_httpproxy.py F401 E501 E128
+    tests/test_downloadermiddleware_redirect.py E501 E303 E128 E306 E127 E305
+    tests/test_downloadermiddleware_retry.py E501 E128 W293 E251 E502 E303 E126
+    tests/test_downloadermiddleware_robotstxt.py E501
+    tests/test_downloadermiddleware_stats.py E501
+    tests/test_dupefilters.py E302 E221 E501 E741 W293 W291 E128 E124
+    tests/test_engine.py E401 E501 E502 E128 E261
+    tests/test_exporters.py E501 E731 E306 E128 E124
+    tests/test_extension_telnet.py F401 F841
+    tests/test_feedexport.py E501 F401 F841 E241
+    tests/test_http_cookies.py E501
+    tests/test_http_headers.py E302 E501
+    tests/test_http_request.py F401 E402 E501 E231 E261 E127 E128 W293 E502 E128 E502 E126 E123
+    tests/test_http_response.py E501 E301 E502 E128 E265
+    tests/test_item.py E701 E128 E231 F841 E306
+    tests/test_link.py E501
+    tests/test_linkextractors.py E501 E128 E231 E124
+    tests/test_loader.py E302 E501 E731 E303 E741 E128 E117 E241
+    tests/test_logformatter.py E128 E501 E231 E122 E302
+    tests/test_mail.py E302 E128 E501 E305
+    tests/test_middleware.py E302 E501 E128
+    tests/test_pipeline_crawl.py E131 E501 E128 E126
+    tests/test_pipeline_files.py F401 E501 W293 E303 E272 E226
+    tests/test_pipeline_images.py F401 F841 E501 E303
+    tests/test_pipeline_media.py E501 E741 E731 E128 E261 E306 E502
+    tests/test_request_cb_kwargs.py E501
+    tests/test_responsetypes.py E501 E302 E305
+    tests/test_robotstxt_interface.py F401 E302 E501 W291 E501
+    tests/test_scheduler.py E501 E126 E123
+    tests/test_selector.py F401 E501 E127
+    tests/test_spider.py E501 F401
+    tests/test_spidermiddleware.py E501 E226
+    tests/test_spidermiddleware_httperror.py E128 E501 E127 E121
+    tests/test_spidermiddleware_offsite.py E302 E501 E128 E111 W293
+    tests/test_spidermiddleware_output_chain.py F401 E501 E302 W293 E226
+    tests/test_spidermiddleware_referer.py F401 E501 E302 F841 E125 E201 E261 E124 E501 E241 E121
+    tests/test_squeues.py E501 E302 E701 E741
+    tests/test_utils_conf.py E501 E231 E303 E128
+    tests/test_utils_console.py E302 E231
+    tests/test_utils_curl.py E501
+    tests/test_utils_datatypes.py E402 E501 E305
+    tests/test_utils_defer.py E306 E261 E501 E302 F841 E226
+    tests/test_utils_deprecate.py F841 E306 E501
+    tests/test_utils_http.py E302 E501 E502 E128 W504
+    tests/test_utils_httpobj.py E302
+    tests/test_utils_iterators.py E501 E128 E129 E302 E303 E241
+    tests/test_utils_log.py E741 E226
+    tests/test_utils_python.py E501 E303 E731 E701 E305
+    tests/test_utils_reqser.py F401 E501 E128
+    tests/test_utils_request.py E302 E501 E128 E305
+    tests/test_utils_response.py E501
+    tests/test_utils_signal.py E741 F841 E302 E731 E226
+    tests/test_utils_sitemap.py E302 E128 E501 E124
+    tests/test_utils_spider.py E261 E302 E305
+    tests/test_utils_template.py E305
+    tests/test_utils_url.py F401 E501 E127 E302 E305 E211 E125 E501 E226 E241 E126 E123
+    tests/test_webclient.py E501 E128 E122 E303 E402 E306 E226 E241 E123 E126
+    tests/mocks/dummydbm.py E302
+    tests/test_cmdline/__init__.py E502 E501
+    tests/test_cmdline/extensions.py E302
+    tests/test_settings/__init__.py F401 E501 E128
+    tests/test_spiderloader/__init__.py E128 E501 E302
+    tests/test_spiderloader/test_spiders/spider0.py E302
+    tests/test_spiderloader/test_spiders/spider1.py E302
+    tests/test_spiderloader/test_spiders/spider2.py E302
+    tests/test_spiderloader/test_spiders/spider3.py E302
+    tests/test_spiderloader/test_spiders/nested/spider4.py E302
+    tests/test_utils_misc/__init__.py E501 E231
diff --git a/scrapy/commands/check.py b/scrapy/commands/check.py
index ac2a95c9b..ad241c59f 100644
--- a/scrapy/commands/check.py
+++ b/scrapy/commands/check.py
@@ -95,4 +95,3 @@ class Command(ScrapyCommand):
             result.printErrors()
             result.printSummary(start, stop)
             self.exitcode = int(not result.wasSuccessful())
-
diff --git a/scrapy/commands/startproject.py b/scrapy/commands/startproject.py
index 34df25cef..e65131ae8 100644
--- a/scrapy/commands/startproject.py
+++ b/scrapy/commands/startproject.py
@@ -118,4 +118,3 @@ class Command(ScrapyCommand):
         _templates_base_dir = self.settings['TEMPLATES_DIR'] or \
             join(scrapy.__path__[0], 'templates')
         return join(_templates_base_dir, 'project')
-
diff --git a/scrapy/commands/version.py b/scrapy/commands/version.py
index 494855500..1516c5997 100644
--- a/scrapy/commands/version.py
+++ b/scrapy/commands/version.py
@@ -28,4 +28,3 @@ class Command(ScrapyCommand):
                 print(patt % (name, version))
         else:
             print("Scrapy %s" % scrapy.__version__)
-
diff --git a/scrapy/core/downloader/handlers/ftp.py b/scrapy/core/downloader/handlers/ftp.py
index 2116a5a44..aef231e82 100644
--- a/scrapy/core/downloader/handlers/ftp.py
+++ b/scrapy/core/downloader/handlers/ftp.py
@@ -112,4 +112,3 @@ class FTPDownloadHandler(object):
                 httpcode = self.CODE_MAPPING.get(ftpcode, self.CODE_MAPPING["default"])
                 return Response(url=request.url, status=httpcode, body=to_bytes(message))
         raise result.type(result.value)
-
diff --git a/scrapy/core/downloader/webclient.py b/scrapy/core/downloader/webclient.py
index 9699da109..798346f19 100644
--- a/scrapy/core/downloader/webclient.py
+++ b/scrapy/core/downloader/webclient.py
@@ -157,4 +157,3 @@ class ScrapyHTTPClientFactory(HTTPClientFactory):
     def gotHeaders(self, headers):
         self.headers_time = time()
         self.response_headers = headers
-
diff --git a/scrapy/core/scraper.py b/scrapy/core/scraper.py
index 1f389cf2e..40de6b87a 100644
--- a/scrapy/core/scraper.py
+++ b/scrapy/core/scraper.py
@@ -244,4 +244,3 @@ class Scraper(object):
             return self.signals.send_catch_log_deferred(
                 signal=signals.item_scraped, item=output, response=response,
                 spider=spider)
-
diff --git a/scrapy/http/headers.py b/scrapy/http/headers.py
index 860a5c9c6..dcaaeddfa 100644
--- a/scrapy/http/headers.py
+++ b/scrapy/http/headers.py
@@ -87,5 +87,3 @@ class Headers(CaselessDict):
     def __copy__(self):
         return self.__class__(self)
     copy = __copy__
-
-
diff --git a/scrapy/interfaces.py b/scrapy/interfaces.py
index 89ad2b14f..d48babc3c 100644
--- a/scrapy/interfaces.py
+++ b/scrapy/interfaces.py
@@ -15,4 +15,3 @@ class ISpiderLoader(Interface):
 
     def find_by_request(request):
         """Return the list of spiders names that can handle the given request"""
-
diff --git a/scrapy/link.py b/scrapy/link.py
index a175b8afd..be1888ef0 100644
--- a/scrapy/link.py
+++ b/scrapy/link.py
@@ -28,4 +28,3 @@ class Link(object):
     def __repr__(self):
         return 'Link(url=%r, text=%r, fragment=%r, nofollow=%r)' % \
             (self.url, self.text, self.fragment, self.nofollow)
-
diff --git a/scrapy/spiders/feed.py b/scrapy/spiders/feed.py
index 06e212e1c..197812a26 100644
--- a/scrapy/spiders/feed.py
+++ b/scrapy/spiders/feed.py
@@ -133,4 +133,3 @@ class CSVFeedSpider(Spider):
             raise NotConfigured('You must define parse_row method in order to scrape this CSV feed')
         response = self.adapt_response(response)
         return self.parse_rows(response)
-
diff --git a/scrapy/spiders/init.py b/scrapy/spiders/init.py
index 2efb1a869..fd41133ea 100644
--- a/scrapy/spiders/init.py
+++ b/scrapy/spiders/init.py
@@ -29,4 +29,3 @@ class InitSpider(Spider):
         spider
         """
         return self.initialized()
-
diff --git a/scrapy/statscollectors.py b/scrapy/statscollectors.py
index 6da9ddcd2..f0bfaed34 100644
--- a/scrapy/statscollectors.py
+++ b/scrapy/statscollectors.py
@@ -80,5 +80,3 @@ class DummyStatsCollector(StatsCollector):
 
     def min_value(self, key, value, spider=None):
         pass
-
-
diff --git a/scrapy/utils/http.py b/scrapy/utils/http.py
index b6e05c862..ad49ef3e9 100644
--- a/scrapy/utils/http.py
+++ b/scrapy/utils/http.py
@@ -34,4 +34,3 @@ def decode_chunked_transfer(chunked_body):
         body += t[:size]
         t = t[size+2:]
     return body
-
diff --git a/scrapy/utils/misc.py b/scrapy/utils/misc.py
index 0de3f18b3..9955fb1e7 100644
--- a/scrapy/utils/misc.py
+++ b/scrapy/utils/misc.py
@@ -135,7 +135,7 @@ def create_instance(objcls, settings, crawler, *args, **kwargs):
     """
     if settings is None:
         if crawler is None:
-            raise ValueError("Specifiy at least one of settings and crawler.")
+            raise ValueError("Specify at least one of settings and crawler.")
         settings = crawler.settings
     if crawler and hasattr(objcls, 'from_crawler'):
         return objcls.from_crawler(crawler, *args, **kwargs)
diff --git a/tests/mockserver.py b/tests/mockserver.py
index 15b1b24f5..71fabae0c 100644
--- a/tests/mockserver.py
+++ b/tests/mockserver.py
@@ -209,8 +209,7 @@ class MockServer():
 
     def __exit__(self, exc_type, exc_value, traceback):
         self.proc.kill()
-        self.proc.wait()
-        time.sleep(0.2)
+        self.proc.communicate()
 
     def url(self, path, is_secure=False):
         host = self.http_address.replace('0.0.0.0', '127.0.0.1')
diff --git a/tests/test_cmdline/extensions.py b/tests/test_cmdline/extensions.py
index 72867eb56..28456b55d 100644
--- a/tests/test_cmdline/extensions.py
+++ b/tests/test_cmdline/extensions.py
@@ -12,4 +12,3 @@ class TestExtension(object):
 
 class DummyExtension(object):
     pass
-
diff --git a/tests/test_settings/default_settings.py b/tests/test_settings/default_settings.py
index c24b5a9b9..26a555275 100644
--- a/tests/test_settings/default_settings.py
+++ b/tests/test_settings/default_settings.py
@@ -2,4 +2,3 @@
 TEST_DEFAULT = 'defvalue'
 
 TEST_DICT = {'key': 'val'}
-
diff --git a/tests/test_spidermiddleware_depth.py b/tests/test_spidermiddleware_depth.py
index 3685d5a6f..71cca2472 100644
--- a/tests/test_spidermiddleware_depth.py
+++ b/tests/test_spidermiddleware_depth.py
@@ -40,4 +40,3 @@ class TestDepthMiddleware(TestCase):
 
     def tearDown(self):
         self.stats.close_spider(self.spider, '')
-
diff --git a/tests/test_spidermiddleware_urllength.py b/tests/test_spidermiddleware_urllength.py
index a0aae0fdd..5ef2b23fd 100644
--- a/tests/test_spidermiddleware_urllength.py
+++ b/tests/test_spidermiddleware_urllength.py
@@ -18,4 +18,3 @@ class TestUrlLengthMiddleware(TestCase):
         spider = Spider('foo')
         out = list(mw.process_spider_output(res, reqs, spider))
         self.assertEqual(out, [short_url_req])
-
diff --git a/tests/test_utils_datatypes.py b/tests/test_utils_datatypes.py
index 8782e4c53..50257bbe6 100644
--- a/tests/test_utils_datatypes.py
+++ b/tests/test_utils_datatypes.py
@@ -231,4 +231,3 @@ class SequenceExcludeTest(unittest.TestCase):
 
 if __name__ == "__main__":
     unittest.main()
-
diff --git a/tests/test_utils_http.py b/tests/test_utils_http.py
index 583105673..2524153ea 100644
--- a/tests/test_utils_http.py
+++ b/tests/test_utils_http.py
@@ -16,5 +16,3 @@ class ChunkedTest(unittest.TestCase):
             "This is the data in the first chunk\r\n" +
             "and this is the second one\r\n" +
             "consequence")
-
-
diff --git a/tests/test_utils_spider.py b/tests/test_utils_spider.py
index 045e72117..d9de1ce77 100644
--- a/tests/test_utils_spider.py
+++ b/tests/test_utils_spider.py
@@ -34,4 +34,3 @@ class UtilsSpidersTestCase(unittest.TestCase):
 
 if __name__ == "__main__":
     unittest.main()
-
diff --git a/tox.ini b/tox.ini
index 821144381..cc3463a4d 100644
--- a/tox.ini
+++ b/tox.ini
@@ -62,6 +62,14 @@ basepython = pypy3
 commands =
     py.test {posargs:scrapy tests}
 
+[testenv:flake8]
+basepython = python3.8
+deps =
+    {[testenv]deps}
+    pytest-flake8
+commands =
+    py.test --flake8 {posargs:scrapy tests}
+
 [docs]
 changedir = docs
 deps =