diff --git a/.travis.yml b/.travis.yml
index 1331ca5..71805cc 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -10,3 +10,4 @@ install:
 # command to run the dependencies
 script:
   - "pytest"
+  - "black responder tests setup.py --check"
\ No newline at end of file
diff --git a/responder/api.py b/responder/api.py
index 94f1b71..e42a4ee 100644
--- a/responder/api.py
+++ b/responder/api.py
@@ -251,9 +251,7 @@ class API:
                 cont = True
         except Exception:
             self.background(
-                self.default_response,
-                websocket=route.uses_websocket,
-                error=True
+                self.default_response, websocket=route.uses_websocket, error=True
             )
             raise
 
@@ -587,7 +585,6 @@ class API:
 
         def static_url(asset):
             return f"{self.static_route}/{asset}"
-            # return asset
 
         return template.render(
             document=document,
@@ -652,6 +649,6 @@ class API:
         spawn()
 
     def run(self, **kwargs):
-        if 'debug' not in kwargs:
-            kwargs.update({'debug': self.debug})
+        if "debug" not in kwargs:
+            kwargs.update({"debug": self.debug})
         self.serve(**kwargs)
diff --git a/responder/cli.py b/responder/cli.py
index bb4cdbe..8c5548b 100644
--- a/responder/cli.py
+++ b/responder/cli.py
@@ -40,4 +40,4 @@ def cli():
             prop = "api"
 
         app = __import__(module)
-        getattr(app, prop).run()
\ No newline at end of file
+        getattr(app, prop).run()
diff --git a/responder/models.py b/responder/models.py
index 4dfe8ff..b2f2ef6 100644
--- a/responder/models.py
+++ b/responder/models.py
@@ -89,9 +89,16 @@ class QueryDict(dict):
         yield from super().items()
 
 
-# TODO: add slots
 class Request:
-    __slots__ = ["_starlette", "formats", "_headers", "_encoding", "api", "_content", "_cookies"]
+    __slots__ = [
+        "_starlette",
+        "formats",
+        "_headers",
+        "_encoding",
+        "api",
+        "_content",
+        "_cookies",
+    ]
 
     def __init__(self, scope, receive, api=None):
         self._starlette = StarletteRequest(scope, receive)
@@ -263,7 +270,7 @@ class Response:
             {}
         )  #: A Python dictionary of ``{key: value}``, representing the headers of the response.
         self.formats = formats
-        self.cookies = SimpleCookie()  #: The cookies set in the Response, as a dictionary
+        self.cookies = SimpleCookie()  #: The cookies set in the Response
         self.session = (
             req.session.copy()
         )  #: The cookie-based session data, in dict form, to add to the Response.
@@ -295,7 +302,7 @@ class Response:
         domain=None,
         max_age=None,
         secure=False,
-        httponly=True
+        httponly=True,
     ):
         self.cookies[key] = value
         morsel = self.cookies[key]
@@ -317,7 +324,6 @@ class Response:
         )
         starlette_response.raw_headers.extend(cookie_header)
 
-
     async def __call__(self, receive, send):
         body, headers = await self.body
         if self.headers:
diff --git a/responder/routes.py b/responder/routes.py
index eb77071..490c2f5 100644
--- a/responder/routes.py
+++ b/responder/routes.py
@@ -55,7 +55,7 @@ class Route:
     def _weight(self):
         params = set(self._param_pattern.findall(self.route))
         params_count = len(params)
-        w = len(self.route.rsplit('}', 1)[-1].strip('/'))
+        w = len(self.route.rsplit("}", 1)[-1].strip("/"))
         return params_count != 0, w == 0, -params_count
 
     @property
diff --git a/responder/statics.py b/responder/statics.py
index ff5c461..c10acfa 100644
--- a/responder/statics.py
+++ b/responder/statics.py
@@ -4,11 +4,11 @@ DEFAULT_SESSION_COOKIE = "Responder-Session"
 DEFAULT_SECRET_KEY = "NOTASECRET"
 
 DEFAULT_CORS_PARAMS = {
-	"allow_origins": (),
-	"allow_methods": ("GET",),
-	"allow_headers": (),
-	"allow_credentials": False,
-	"allow_origin_regex": None,
-	"expose_headers": (),
-	"max_age": 600,
+    "allow_origins": (),
+    "allow_methods": ("GET",),
+    "allow_headers": (),
+    "allow_credentials": False,
+    "allow_origin_regex": None,
+    "expose_headers": (),
+    "max_age": 600,
 }
diff --git a/tests/conftest.py b/tests/conftest.py
index c7aabf9..547a388 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -18,10 +18,7 @@ def current_dir():
 
 @pytest.fixture
 def api():
-    return responder.API(
-        debug=False,
-        allowed_hosts=[";"]
-    )
+    return responder.API(debug=False, allowed_hosts=[";"])
 
 
 @pytest.fixture
@@ -49,6 +46,7 @@ def flask():
 
     return app
 
+
 @pytest.fixture
 def schema():
     class Query(graphene.ObjectType):
diff --git a/tests/test_responder.py b/tests/test_responder.py
index c1e02a9..e195d5f 100644
--- a/tests/test_responder.py
+++ b/tests/test_responder.py
@@ -429,7 +429,7 @@ def test_cookies(api):
             path="/",
             max_age=123,
             secure=False,
-            httponly=True
+            httponly=True,
         )
 
     r = api.requests.get(api.url_for(cookies), cookies={"hello": "universe"})
@@ -438,7 +438,7 @@ def test_cookies(api):
     assert "hello" in r.cookies
 
     r = api.requests.get(api.url_for(cookies))
-    assert r.json() == {'cookies': {'hello': 'world', 'sent': 'true'}}
+    assert r.json() == {"cookies": {"hello": "world", "sent": "true"}}
 
 
 @pytest.mark.xfail
@@ -449,11 +449,11 @@ def test_sessions(api):
         resp.media = resp.session
 
     r = api.requests.get(api.url_for(view))
-    assert "Responder-Session" in r.cookies
+    assert api.session_cookie in r.cookies
 
     r = api.requests.get(api.url_for(view))
     assert (
-        r.cookies["Responder-Session"]
+        r.cookies[api.session_cookie]
         == '{"hello": "world"}.r3EB04hEEyLYIJaAXCEq3d4YEbs'
     )
     assert r.json() == {"hello": "world"}
@@ -489,8 +489,9 @@ def test_500(api):
     def view(req, resp):
         raise ValueError
 
-    dumb_client = responder.api.TestClient(api, base_url="http://;",
-                                           raise_server_exceptions=False)
+    dumb_client = responder.api.TestClient(
+        api, base_url="http://;", raise_server_exceptions=False
+    )
     r = dumb_client.get(api.url_for(view))
     assert not r.ok
     assert r.status_code == responder.status_codes.HTTP_500
diff --git a/tests/test_routes.py b/tests/test_routes.py
index e1b79f4..02230d1 100644
--- a/tests/test_routes.py
+++ b/tests/test_routes.py
@@ -89,25 +89,41 @@ def test_does_match_with_route(route, match, expected):
     [
         pytest.param("/{greetings}", (True, True, -1), id="with one param"),
         pytest.param(
-            "/{greetings}.{name}", (True, True, -2), id="with 2 params and dot in the middle"
+            "/{greetings}.{name}",
+            (True, True, -2),
+            id="with 2 params and dot in the middle",
         ),
-        pytest.param("/{greetings}/{name}", (True, True, -2), id="with 2 params and subpath"),
         pytest.param(
-            "/{greetings}/{name}/{hello}", (True, True, -3), id="with 3 params and subpath"
+            "/{greetings}/{name}", (True, True, -2), id="with 2 params and subpath"
+        ),
+        pytest.param(
+            "/{greetings}/{name}/{hello}",
+            (True, True, -3),
+            id="with 3 params and subpath",
         ),
         pytest.param(
             "/{greetings}_{name}", (True, True, -2), id="with 2 params and underscore"
         ),
         pytest.param("/{greetings}/test", (True, False, -1), id="with one param"),
         pytest.param(
-            "/{greetings}.{name}/test", (True, False, -2), id="with 2 params and dot in the middle"
-        ),
-        pytest.param("/{greetings}/{name}/test", (True, False, -2), id="with 2 params and subpath"),
-        pytest.param(
-            "/{greetings}/{name}/{hello}/test", (True, False, -3), id="with 3 params and subpath"
+            "/{greetings}.{name}/test",
+            (True, False, -2),
+            id="with 2 params and dot in the middle",
         ),
         pytest.param(
-            "/{greetings}_{name}/test", (True, False, -2), id="with 2 params and underscore"
+            "/{greetings}/{name}/test",
+            (True, False, -2),
+            id="with 2 params and subpath",
+        ),
+        pytest.param(
+            "/{greetings}/{name}/{hello}/test",
+            (True, False, -3),
+            id="with 3 params and subpath",
+        ),
+        pytest.param(
+            "/{greetings}_{name}/test",
+            (True, False, -2),
+            id="with 2 params and underscore",
         ),
         pytest.param("/hello", (False, False, 0), id="without params"),
     ],