Splits test factories and updates documentation

tests/unit/test_utils.py

@@ -2,6 +2,7 @@ import pytest
 
 from personalisation.utils import impersonate_other_page
 
+
 class Page(object):
     def __init__(self, path, depth, url_path, title):
         self.path = path
@@ -12,6 +13,7 @@ class Page(object):
     def __eq__(self, other):
         return self.__dict__ == other.__dict__
 
+
 def test_impersonate_other_page():
     page = Page(path="/", depth=0, url_path="/", title="Hoi")
     other_page = Page(path="/other", depth=1, url_path="/other", title="Doei")