title: undefined method `cache' for nil:NilClass after upgrading to rails 4.2.5.1
body: <p>While upgrading from rails <code>4.2.5</code> to the recently released <code>4.2.5.1</code>, I have encountered this error. This error exists only for specs with a <code>before_filter</code> that render an invalid status, such as <code>render file: "public/422", status: :unauthorized</code>. I get this error for both ruby-2.2.2 and ruby-2.3.0</p>
  
  <p>The error exists in the action_view resolver method, implying the <code>@cache</code> value is nil. However, in the <code>initialize</code> method it should be instantiated: <code>@cache = Cache.new</code></p>
  
  <p>I am still working on a reproducible sample, but am so far lost as to how <code>@cache</code> could be nil.</p>
  
  <p>These are the config variables set in my <code>test.rb</code> environment</p>
  
  <pre><code>config.cache_classes = true
  config.eager_load = false
  
  config.serve_static_files   = true
  config.static_cache_control = 'public, max-age=3600'
  
  config.consider_all_requests_local       = true
  config.action_controller.perform_caching = false
  
  config.action_dispatch.show_exceptions = false
  config.action_controller.allow_forgery_protection = false  
  
  config.action_mailer.default_url_options = {
    :host =&gt; '127.0.0.1',
    :port =&gt; 3000
  }
  
  config.action_mailer.delivery_method = :test
  config.active_support.test_order = :random
  config.active_support.deprecation = :stderr
  </code></pre>
  
  <p>Stack Trace:</p>
  
  <pre><code>1) UserController validates user
   Failure/Error: put :update, { id: user.id  }
   NoMethodError:
     undefined method `cache' for nil:NilClass
   # ~/.rvm/gems/ruby-2.2.2/gems/actionview-4.2.5.1/lib/action_view/template/resolver.rb:151:in `cached'
   # ~/.rvm/gems/ruby-2.2.2/gems/actionview-4.2.5.1/lib/action_view/template/resolver.rb:121:in `find_all_anywhere'
   # ~/.rvm/gems/ruby-2.2.2/gems/actionview-4.2.5.1/lib/action_view/path_set.rb:68:in `block (2 levels) in _find_all'
   # ~/.rvm/gems/ruby-2.2.2/gems/actionview-4.2.5.1/lib/action_view/path_set.rb:66:in `each'
   # ~/.rvm/gems/ruby-2.2.2/gems/actionview-4.2.5.1/lib/action_view/path_set.rb:66:in `block in _find_all'
   # ~/.rvm/gems/ruby-2.2.2/gems/actionview-4.2.5.1/lib/action_view/path_set.rb:65:in `each'
   # ~/.rvm/gems/ruby-2.2.2/gems/actionview-4.2.5.1/lib/action_view/path_set.rb:65:in `_find_all'
   # ~/.rvm/gems/ruby-2.2.2/gems/actionview-4.2.5.1/lib/action_view/path_set.rb:50:in `find_file'
   # ~/.rvm/gems/ruby-2.2.2/gems/actionview-4.2.5.1/lib/action_view/lookup_context.rb:126:in `find_file'
   # ~/.rvm/gems/ruby-2.2.2/gems/actionview-4.2.5.1/lib/action_view/renderer/abstract_renderer.rb:18:in `find_file'
   # ~/.rvm/gems/ruby-2.2.2/gems/actionview-4.2.5.1/lib/action_view/renderer/template_renderer.rb:32:in `block in determine_template'
   # ~/.rvm/gems/ruby-2.2.2/gems/actionview-4.2.5.1/lib/action_view/lookup_context.rb:147:in `with_fallbacks'
   # ~/.rvm/gems/ruby-2.2.2/gems/actionview-4.2.5.1/lib/action_view/renderer/abstract_renderer.rb:18:in `with_fallbacks'
   # ~/.rvm/gems/ruby-2.2.2/gems/actionview-4.2.5.1/lib/action_view/renderer/template_renderer.rb:32:in `determine_template'
   # ~/.rvm/gems/ruby-2.2.2/gems/actionview-4.2.5.1/lib/action_view/renderer/template_renderer.rb:8:in `render'
   # ~/.rvm/gems/ruby-2.2.2/gems/actionview-4.2.5.1/lib/action_view/renderer/renderer.rb:42:in `render_template'
   # ~/.rvm/gems/ruby-2.2.2/gems/actionview-4.2.5.1/lib/action_view/renderer/renderer.rb:23:in `render'
   # ~/.rvm/gems/ruby-2.2.2/gems/actionview-4.2.5.1/lib/action_view/rendering.rb:100:in `_render_template'
   # ~/.rvm/gems/ruby-2.2.2/gems/actionpack-4.2.5.1/lib/action_controller/metal/streaming.rb:217:in `_render_template'
   # ~/.rvm/gems/ruby-2.2.2/gems/actionview-4.2.5.1/lib/action_view/rendering.rb:83:in `render_to_body'
   # ~/.rvm/gems/ruby-2.2.2/gems/actionpack-4.2.5.1/lib/action_controller/metal/rendering.rb:32:in `render_to_body'
   # ~/.rvm/gems/ruby-2.2.2/gems/actionpack-4.2.5.1/lib/action_controller/metal/renderers.rb:37:in `render_to_body'
   # ~/.rvm/gems/ruby-2.2.2/gems/actionpack-4.2.5.1/lib/abstract_controller/rendering.rb:25:in `render'
   # ~/.rvm/gems/ruby-2.2.2/gems/actionpack-4.2.5.1/lib/action_controller/metal/rendering.rb:16:in `render'
   # ~/.rvm/gems/ruby-2.2.2/gems/actionpack-4.2.5.1/lib/action_controller/metal/instrumentation.rb:44:in `block (2 levels) in render'
   # ~/.rvm/gems/ruby-2.2.2/gems/activesupport-4.2.5.1/lib/active_support/core_ext/benchmark.rb:12:in `block in ms'
   # ~/.rvm/rubies/ruby-2.2.2/lib/ruby/2.2.0/benchmark.rb:303:in `realtime'
   # ~/.rvm/gems/ruby-2.2.2/gems/activesupport-4.2.5.1/lib/active_support/core_ext/benchmark.rb:12:in `ms'
   # ~/.rvm/gems/ruby-2.2.2/gems/actionpack-4.2.5.1/lib/action_controller/metal/instrumentation.rb:44:in `block in render'
   # ~/.rvm/gems/ruby-2.2.2/gems/actionpack-4.2.5.1/lib/action_controller/metal/instrumentation.rb:87:in `cleanup_view_runtime'
   # ~/.rvm/gems/ruby-2.2.2/gems/activerecord-4.2.5.1/lib/active_record/railties/controller_runtime.rb:25:in `cleanup_view_runtime'
   # ~/.rvm/gems/ruby-2.2.2/gems/actionpack-4.2.5.1/lib/action_controller/metal/instrumentation.rb:43:in `render'
  </code></pre>