diff --git a/test/models/customer_test.rb b/test/models/customer_test.rb
index 744eb07e1..a81a834cb 100644
--- a/test/models/customer_test.rb
+++ b/test/models/customer_test.rb
@@ -2,14 +2,16 @@
 
 describe Customer do
   let(:customer) { Customer.new }
-  let(:customer) { customers(:Mary)}
+  let(:customer) { customers(:mary)}
 
   describe "relations" do
     it "has a list of rentals" do
       mary = customers(:mary)
-      mary.must_respond_to :rentals
-      mary.rentals.each do |rental|
-        mary.must_be_kind_of Rental
+
+      customer.rentals.each do |rental|
+        rental.must_be_kind_of Rental
+        rental.customer.must_be_instance_of Customer
+        rental.customer.must_equal mary
       end
     end