Use black for formatting

tests/test_auth.py

@@ -9,10 +9,10 @@ def test_redirects_when_not_logged_in(http_client, base_url):
     response = yield http_client.fetch(
         base_url + "/home", raise_error=False, follow_redirects=False
     )
-    location = response.headers['Location']
+    location = response.headers["Location"]
     assert response.code == 302
     assert response.error
-    assert re.match('/\??', location)
+    assert re.match("/\??", location)
 
 
 @pytest.mark.gen_test
@@ -22,16 +22,15 @@ def test_login_with_valid_bearer_token(app, monkeypatch, http_client, base_url):
         return True
 
     monkeypatch.setattr(
-        "atst.handlers.login.Login._validate_login_token",
-        _validate_login_token
+        "atst.handlers.login.Login._validate_login_token", _validate_login_token
     )
     response = yield http_client.fetch(
         base_url + "/login?bearer-token=abc-123",
         follow_redirects=False,
-        raise_error=False
+        raise_error=False,
     )
     assert response.headers["Set-Cookie"].startswith("atst")
-    assert response.headers['Location'] == '/home'
+    assert response.headers["Location"] == "/home"
     assert response.code == 302