--- a/testing/web-platform/tests/webdriver/tests/cookies/add_cookie.py
+++ b/testing/web-platform/tests/webdriver/tests/cookies/add_cookie.py
@@ -1,26 +1,28 @@
 from tests.support.asserts import assert_success
 from tests.support.fixtures import clear_all_cookies
 from datetime import datetime, timedelta
 
+
 def test_add_domain_cookie(session, url, server_config):
     session.url = url("/common/blank.html")
     clear_all_cookies(session)
     create_cookie_request = {
         "cookie": {
             "name": "hello",
             "value": "world",
             "domain": server_config["browser_host"],
             "path": "/",
             "httpOnly": False,
             "secure": False
         }
     }
-    result = session.transport.send("POST", "session/%s/cookie" % session.session_id, create_cookie_request)
+    result = session.transport.send(
+        "POST", "session/%s/cookie" % session.session_id, create_cookie_request)
     assert_success(result)
 
     result = session.transport.send("GET", "session/%s/cookie" % session.session_id)
     assert result.status == 200
     assert "value" in result.body
     assert isinstance(result.body["value"], list)
     assert len(result.body["value"]) == 1
     assert isinstance(result.body["value"][0], dict)
@@ -33,31 +35,33 @@ def test_add_domain_cookie(session, url,
     assert "domain" in cookie
     assert isinstance(cookie["domain"], basestring)
 
     assert cookie["name"] == "hello"
     assert cookie["value"] == "world"
     assert cookie["domain"] == server_config["browser_host"] or \
         cookie["domain"] == ".%s" % server_config["browser_host"]
 
+
 def test_add_cookie_for_ip(session, url, server_config, configuration):
     session.url = "http://127.0.0.1:%s/common/blank.html" % (server_config["ports"]["http"][0])
     clear_all_cookies(session)
     create_cookie_request = {
         "cookie": {
             "name": "hello",
             "value": "world",
             "domain": "127.0.0.1",
             "path": "/",
             "httpOnly": False,
             "secure": False
         }
     }
 
-    result = session.transport.send("POST", "session/%s/cookie" % session.session_id, create_cookie_request)
+    result = session.transport.send(
+        "POST", "session/%s/cookie" % session.session_id, create_cookie_request)
     assert_success(result)
 
     result = session.transport.send("GET", "session/%s/cookie" % session.session_id)
     assert result.status == 200
     assert "value" in result.body
     assert isinstance(result.body["value"], list)
     assert len(result.body["value"]) == 1
     assert isinstance(result.body["value"][0], dict)
@@ -69,28 +73,31 @@ def test_add_cookie_for_ip(session, url,
     assert isinstance(cookie["value"], basestring)
     assert "domain" in cookie
     assert isinstance(cookie["domain"], basestring)
 
     assert cookie["name"] == "hello"
     assert cookie["value"] == "world"
     assert cookie["domain"] == "127.0.0.1"
 
+
 def test_add_non_session_cookie(session, url):
     session.url = url("/common/blank.html")
     clear_all_cookies(session)
-    a_year_from_now = int((datetime.utcnow() + timedelta(days=365) - datetime.utcfromtimestamp(0)).total_seconds())
+    a_year_from_now = int(
+        (datetime.utcnow() + timedelta(days=365) - datetime.utcfromtimestamp(0)).total_seconds())
     create_cookie_request = {
         "cookie": {
             "name": "hello",
             "value": "world",
             "expiry": a_year_from_now
         }
     }
-    result = session.transport.send("POST", "session/%s/cookie" % session.session_id, create_cookie_request)
+    result = session.transport.send(
+        "POST", "session/%s/cookie" % session.session_id, create_cookie_request)
     assert_success(result)
 
     result = session.transport.send("GET", "session/%s/cookie" % session.session_id)
     assert result.status == 200
     assert "value" in result.body
     assert isinstance(result.body["value"], list)
     assert len(result.body["value"]) == 1
     assert isinstance(result.body["value"][0], dict)
@@ -102,26 +109,28 @@ def test_add_non_session_cookie(session,
     assert isinstance(cookie["value"], basestring)
     assert "expiry" in cookie
     assert isinstance(cookie["expiry"], int)
 
     assert cookie["name"] == "hello"
     assert cookie["value"] == "world"
     assert cookie["expiry"] == a_year_from_now
 
+
 def test_add_session_cookie(session, url):
     session.url = url("/common/blank.html")
     clear_all_cookies(session)
     create_cookie_request = {
         "cookie": {
             "name": "hello",
             "value": "world"
         }
     }
-    result = session.transport.send("POST", "session/%s/cookie" % session.session_id, create_cookie_request)
+    result = session.transport.send(
+        "POST", "session/%s/cookie" % session.session_id, create_cookie_request)
     assert_success(result)
 
     result = session.transport.send("GET", "session/%s/cookie" % session.session_id)
     assert result.status == 200
     assert "value" in result.body
     assert isinstance(result.body["value"], list)
     assert len(result.body["value"]) == 1
     assert isinstance(result.body["value"][0], dict)
@@ -132,27 +141,29 @@ def test_add_session_cookie(session, url
     assert "value" in cookie
     assert isinstance(cookie["value"], basestring)
     if "expiry" in cookie:
         assert cookie.get("expiry") is None
 
     assert cookie["name"] == "hello"
     assert cookie["value"] == "world"
 
+
 def test_add_session_cookie_with_leading_dot_character_in_domain(session, url, server_config):
     session.url = url("/common/blank.html")
     clear_all_cookies(session)
     create_cookie_request = {
         "cookie": {
             "name": "hello",
             "value": "world",
             "domain": ".%s" % server_config["browser_host"]
         }
     }
-    result = session.transport.send("POST", "session/%s/cookie" % session.session_id, create_cookie_request)
+    result = session.transport.send(
+        "POST", "session/%s/cookie" % session.session_id, create_cookie_request)
     assert_success(result)
 
     result = session.transport.send("GET", "session/%s/cookie" % session.session_id)
     assert result.status == 200
     assert "value" in result.body
     assert isinstance(result.body["value"], list)
     assert len(result.body["value"]) == 1
     assert isinstance(result.body["value"][0], dict)