diff --git a/registrasion/tests/controller_helpers.py b/registrasion/tests/controller_helpers.py
new file mode 100644
index 0000000000000000000000000000000000000000..9e4191f0018ad162da52fce2427a26dee8f810f0
--- /dev/null
+++ b/registrasion/tests/controller_helpers.py
@@ -0,0 +1,30 @@
+from registrasion.controllers.cart import CartController
+from registrasion import models as rego
+
+from django.core.exceptions import ObjectDoesNotExist
+
+
+class TestingCartController(CartController):
+
+    def set_quantity(self, product, quantity, batched=False):
+        ''' Sets the _quantity_ of the given _product_ in the cart to the given
+        _quantity_. '''
+
+        self.set_quantities(((product, quantity),))
+
+    def add_to_cart(self, product, quantity):
+        ''' Adds _quantity_ of the given _product_ to the cart. Raises
+        ValidationError if constraints are violated.'''
+
+        try:
+            product_item = rego.ProductItem.objects.get(
+                cart=self.cart,
+                product=product)
+            old_quantity = product_item.quantity
+        except ObjectDoesNotExist:
+            old_quantity = 0
+        self.set_quantity(product, old_quantity + quantity)
+
+    def next_cart(self):
+        self.cart.active = False
+        self.cart.save()