diff --git a/tests/conftest.py b/tests/conftest.py
index e99086635..f7164e1b9 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -36,6 +36,8 @@ from helpers.messagemock import message_mock
 from qutebrowser.config import config
 from qutebrowser.utils import objreg
 
+from PyQt5.QtNetwork import QNetworkCookieJar
+
 
 def pytest_collection_modifyitems(items):
     """Automatically add a 'gui' marker to all gui-related tests.
@@ -269,3 +271,15 @@ def fake_keyevent_factory():
         return evtmock
 
     return fake_keyevent
+
+
+@pytest.yield_fixture
+def cookiejar_and_cache(stubs):
+    """Fixture providing a fake cookie jar and cache."""
+    jar = QNetworkCookieJar()
+    cache = stubs.FakeNetworkCache()
+    objreg.register('cookie-jar', jar)
+    objreg.register('cache', cache)
+    yield
+    objreg.delete('cookie-jar')
+    objreg.delete('cache')
diff --git a/tests/helpers/stubs.py b/tests/helpers/stubs.py
index fad28abe4..88884cf73 100644
--- a/tests/helpers/stubs.py
+++ b/tests/helpers/stubs.py
@@ -24,12 +24,37 @@
 from unittest import mock
 
 from PyQt5.QtCore import pyqtSignal, QPoint, QProcess, QObject
-from PyQt5.QtNetwork import QNetworkRequest
+from PyQt5.QtNetwork import (QNetworkRequest, QAbstractNetworkCache,
+                             QNetworkCacheMetaData)
 from PyQt5.QtWidgets import QCommonStyle
 
 from qutebrowser.config import configexc
 
 
+class FakeNetworkCache(QAbstractNetworkCache):
+
+    def cacheSize(self):
+        return 0
+
+    def data(self, _url):
+        return None
+
+    def insert(self, _dev):
+        pass
+
+    def metaData(self, _url):
+        return QNetworkCacheMetaData()
+
+    def prepare(self, _metadata):
+        return None
+
+    def remove(self, _url):
+        return False
+
+    def updateMetaData(self, _url):
+        pass
+
+
 class FakeKeyEvent:
 
     """Fake QKeyPressEvent stub."""
diff --git a/tests/unit/browser/test_commands.py b/tests/unit/browser/test_commands.py
index 4343175e7..c570ad1b4 100644
--- a/tests/unit/browser/test_commands.py
+++ b/tests/unit/browser/test_commands.py
@@ -33,28 +33,7 @@ from qutebrowser.keyinput import modeman
 
 ObjectsRet = collections.namedtuple('Dispatcher', ['tb', 'cd'])
 
-class FakeNetworkCache(QAbstractNetworkCache):
-
-    def cacheSize(self):
-        return 0
-
-    def data(self, _url):
-        return None
-
-    def insert(self, _dev):
-        pass
-
-    def metaData(self, _url):
-        return QNetworkCacheMetaData()
-
-    def prepare(self, _metadata):
-        return None
-
-    def remove(self, _url):
-        return False
-
-    def updateMetaData(self, _url):
-        pass
+pytestmark = pytest.mark.usefixtures('cookiejar_and_cache')
 
 
 @pytest.yield_fixture(autouse=True)