diff --git a/lib/rails/controller/testing.rb b/lib/rails/controller/testing.rb
index 45a2b27..7b2d0fc 100644
--- a/lib/rails/controller/testing.rb
+++ b/lib/rails/controller/testing.rb
@@ -2,6 +2,7 @@
 require 'rails/controller/testing/test_process'
 require 'rails/controller/testing/integration'
 require 'rails/controller/testing/template_assertions'
+require 'rails/controller/testing/template_instrumentation'
 
 module Rails
   module Controller
@@ -10,16 +11,19 @@ def self.install
         ActiveSupport.on_load(:action_controller_test_case) do
           include Rails::Controller::Testing::TestProcess
           include Rails::Controller::Testing::TemplateAssertions
+          ActionView::TemplateRenderer.prepend(InstrumentDetermineTemplate)
         end
 
         ActiveSupport.on_load(:action_dispatch_integration_test) do
           include Rails::Controller::Testing::TemplateAssertions
           include Rails::Controller::Testing::Integration
           include Rails::Controller::Testing::TestProcess
+          ActionView::TemplateRenderer.prepend(InstrumentDetermineTemplate)
         end
 
         ActiveSupport.on_load(:action_view_test_case) do
           include Rails::Controller::Testing::TemplateAssertions
+          ActionView::TemplateRenderer.prepend(InstrumentDetermineTemplate)
         end
       end
     end
diff --git a/lib/rails/controller/testing/template_assertions.rb b/lib/rails/controller/testing/template_assertions.rb
index ad5e8ad..dcf8b1f 100644
--- a/lib/rails/controller/testing/template_assertions.rb
+++ b/lib/rails/controller/testing/template_assertions.rb
@@ -30,6 +30,16 @@ def setup_subscriptions
             end
           end
 
+          @_subscribers << ActiveSupport::Notifications.subscribe("determine_template.rails_controller_testing") do |_name, _start, _finish, _id, payload|
+            if payload[:options][:file]
+              path = payload[:template_identifier]
+              if path
+                @_files[path] += 1
+                @_files[path.split("/").last] += 1
+              end
+            end
+          end
+
           @_subscribers << ActiveSupport::Notifications.subscribe("!render_template.action_view") do |_name, _start, _finish, _id, payload|
             if virtual_path = payload[:virtual_path]
               partial = virtual_path =~ /^.*\/_[^\/]*$/
@@ -40,12 +50,6 @@ def setup_subscriptions
               end
 
               @_templates[virtual_path] += 1
-            else
-              path = payload[:identifier]
-              if path
-                @_files[path] += 1
-                @_files[path.split("/").last] += 1
-              end
             end
           end
         end
diff --git a/lib/rails/controller/testing/template_instrumentation.rb b/lib/rails/controller/testing/template_instrumentation.rb
new file mode 100644
index 0000000..08cdc27
--- /dev/null
+++ b/lib/rails/controller/testing/template_instrumentation.rb
@@ -0,0 +1,16 @@
+module Rails
+  module Controller
+    module Testing
+      module InstrumentDetermineTemplate
+        def determine_template(options)
+          super.tap do |found|
+            if found
+              instrument_payload = { template_identifier: found.identifier, virtual_path: found.virtual_path, options: options }
+              ActiveSupport::Notifications.instrument("determine_template.rails_controller_testing", instrument_payload)
+            end
+          end
+        end
+      end
+    end
+  end
+end
\ No newline at end of file