Fixed the test edit view

views/index/index.erb

@@ -17,7 +17,7 @@
           <% tests.each do |t| %>
             <tr>
               <td><a href="/test/<%= t.id %>"><%= t.name %></a></td>
-              <td><%= t.benchmark.length %></td>
+              <td><%= t.benchmarks.length %></td>
               <td><%= t.updated_at %></td>
             </tr>
           <% end %>