Adding pluralize to .html.erb causes error in Rails functional tests

I'm working through Agile Web Development With Rails for Rails 3.0, and I'm at a point where running rake test:functionals gives a successful result.

When I add the following code to my .html.erb and re-run the same command, I get errors all over the place.

Code:

<span>
     <% if session[:counter] > 5 %>
        You've visited this page <%= pluralize(session[:counter], 'time')  %>
     <% end %>
</span> 

Error:

 ActionView::Template开发者_开发问答::Error: undefined method '>' for nil:NilClass
 ~/.rvm/gems/ruby-1.9.2-head/gems/activesupport-3.0.3/lib/active_support/whiny_nil.rb:48:in `method_missing'

It looks like the :counter member of your session is not being properly set, so session[:counter] evaluated to nil. Make sure that you're properly setting your session variables in your test. For example, get(:show, {'id' => "12"}, {'user_id' => 5}) would set session[:user_id] to 5.

See http://guides.rubyonrails.org/testing.html#functional-tests-for-your-controllers for more info.