Isolate cart sessions

src/pretix/testutils/sessions.py

@@ -0,0 +1,20 @@
+from django.utils.crypto import get_random_string
+
+
+def add_cart_session(client, event, data):
+    new_id = get_random_string(length=32)
+    session = client.session
+    session['current_cart_event_{}'.format(event.pk)] = new_id
+    if 'carts' not in session:
+        session['carts'] = {}
+    session['carts'][new_id] = data
+    session.save()
+    return new_id
+
+
+def get_cart_session_key(client, event):
+    cart_id = client.session.get('current_cart_event_{}'.format(event.pk))
+    if cart_id:
+        return cart_id
+    else:
+        return add_cart_session(client, event, {})