Change functional tests to make use of a setup block.

railties/lib/generators/test_unit/scaffold/templates/functional_test.rb

 require 'test_helper'
 
 class <%= controller_class_name %>ControllerTest < ActionController::TestCase
+  setup do
+    @<%= file_name %> = <%= table_name %>(:one)
+  end
+
 <% unless options[:singleton] -%>
   test "should get index" do
     get :index
@@ -16,30 +20,30 @@ class <%= controller_class_name %>ControllerTest < ActionController::TestCase
 
   test "should create <%= file_name %>" do
     assert_difference('<%= class_name %>.count') do
-      post :create, :<%= file_name %> => <%= table_name %>(:one).attributes
+      post :create, :<%= file_name %> => @<%= file_name %>.attributes
     end
 
     assert_redirected_to <%= file_name %>_path(assigns(:<%= file_name %>))
   end
 
   test "should show <%= file_name %>" do
-    get :show, :id => <%= table_name %>(:one).to_param
+    get :show, :id => @<%= file_name %>.to_param
     assert_response :success
   end
 
   test "should get edit" do
-    get :edit, :id => <%= table_name %>(:one).to_param
+    get :edit, :id => @<%= file_name %>.to_param
     assert_response :success
   end
 
   test "should update <%= file_name %>" do
-    put :update, :id => <%= table_name %>(:one).to_param, :<%= file_name %> => <%= table_name %>(:one).attributes
+    put :update, :id => @<%= file_name %>.to_param, :<%= file_name %> => @<%= file_name %>.attributes
     assert_redirected_to <%= file_name %>_path(assigns(:<%= file_name %>))
   end
 
   test "should destroy <%= file_name %>" do
     assert_difference('<%= class_name %>.count', -1) do
-      delete :destroy, :id => <%= table_name %>(:one).to_param
+      delete :destroy, :id => @<%= file_name %>.to_param
     end
 
     assert_redirected_to <%= table_name %>_path