1 files changed, 23 insertions, 0 deletions
diff --git a/actionpack/test/controller/integration_test.rb b/actionpack/test/controller/integration_test.rb
index 5535c7ae78..5c0651bd73 100644
--- a/actionpack/test/controller/integration_test.rb
+++ b/actionpack/test/controller/integration_test.rb
@@ -279,6 +279,11 @@ class IntegrationProcessTest < ActionDispatch::IntegrationTest
     def redirect
       redirect_to action_url('get')
     end
+
+    def remove_default_header
+      response.headers.except! 'X-Frame-Options'
+      head :ok
+    end
   end
 
   def test_get
@@ -506,6 +511,24 @@ class IntegrationProcessTest < ActionDispatch::IntegrationTest
     end
   end
 
+  def test_removed_default_headers_on_test_response_are_not_reapplied
+    with_test_route_set do
+      begin
+        header_to_remove = 'X-Frame-Options'
+        original_default_headers = ActionDispatch::Response.default_headers
+        ActionDispatch::Response.default_headers = {
+          'X-Content-Type-Options' => 'nosniff',
+          header_to_remove => 'SAMEORIGIN',
+        }
+        get '/remove_default_header'
+        assert_includes headers, 'X-Content-Type-Options'
+        assert_not_includes headers, header_to_remove, "Should not contain removed default header"
+      ensure
+        ActionDispatch::Response.default_headers = original_default_headers
+      end
+    end
+  end
+
   private
     def with_test_route_set
       with_routing do |set|