diff --git a/test/fixtures/problems.yml b/test/fixtures/problems.yml
--- a/test/fixtures/problems.yml
+++ b/test/fixtures/problems.yml
@@ -1,11 +1,11 @@
 # Read about fixtures at http://ar.rubyonrails.org/classes/Fixtures.html
-one:
+prob_add:
   id: 1
   name: add
   full_name: add_full_name
   available: true
 
-two:
+prob_sub:
   id: 2
   name: subtract
   full_name: subtract_full_name