diff --git a/actionpack/lib/action_view/lookup_context.rb b/actionpack/lib/action_view/lookup_context.rb
index 9bf4289f42963b1aac54fb9d98e9e94f3ef7e1d1..3bb2b98e482c2364488e8ae15fc4f6fe9dfce46b 100644
--- a/actionpack/lib/action_view/lookup_context.rb
+++ b/actionpack/lib/action_view/lookup_context.rb
@@ -59,6 +59,10 @@ def self.get(details)
         @details_keys[details] ||= new
       end
 
+      def self.clear
+        @details_keys.clear
+      end
+
       def initialize
         @hash = object_hash
       end
diff --git a/actionpack/test/template/compiled_templates_test.rb b/actionpack/test/template/compiled_templates_test.rb
index 8fc78283d8f2d8b8a87d4ee388f0dc7fe5d94d5e..30d798d693278f9e519f13c129e842d673540dab 100644
--- a/actionpack/test/template/compiled_templates_test.rb
+++ b/actionpack/test/template/compiled_templates_test.rb
@@ -3,6 +3,10 @@
 
 class CompiledTemplatesTest < Test::Unit::TestCase
   def setup
+    # Clean up any details key cached to expose failures
+    # that otherwise would appear just on isolated tests
+    ActionView::LookupContext::DetailsKey.clear
+
     @compiled_templates = ActionView::CompiledTemplates
     @compiled_templates.instance_methods.each do |m|
       @compiled_templates.send(:remove_method, m) if m =~ /^_render_template_/
diff --git a/actionpack/test/template/lookup_context_test.rb b/actionpack/test/template/lookup_context_test.rb
index bac2530e3dc0c2260fec1957648d3809d99e948b..c65f707da0c00f2a1294b6f90554fb712990bebd 100644
--- a/actionpack/test/template/lookup_context_test.rb
+++ b/actionpack/test/template/lookup_context_test.rb
@@ -1,20 +1,14 @@
 require "abstract_unit"
 require "abstract_controller/rendering"
 
-ActionView::LookupContext::DetailsKey.class_eval do
-  def self.details_keys
-    @details_keys
-  end
-end
-
 class LookupContextTest < ActiveSupport::TestCase
   def setup
     @lookup_context = ActionView::LookupContext.new(FIXTURE_LOAD_PATH, {})
+    ActionView::LookupContext::DetailsKey.clear
   end
 
   def teardown
     I18n.locale = :en
-    ActionView::LookupContext::DetailsKey.details_keys.clear
   end
 
   test "process view paths on initialization" do