1 files changed, 70 insertions, 0 deletions
diff --git a/railties/test/application/per_request_digest_cache_test.rb b/railties/test/application/per_request_digest_cache_test.rb
new file mode 100644
index 0000000000..ab055c7648
--- /dev/null
+++ b/railties/test/application/per_request_digest_cache_test.rb
@@ -0,0 +1,70 @@
+# frozen_string_literal: true
+
+require "isolation/abstract_unit"
+require "rack/test"
+require "minitest/mock"
+
+require "action_view"
+
+class PerRequestDigestCacheTest < ActiveSupport::TestCase
+  include ActiveSupport::Testing::Isolation
+  include Rack::Test::Methods
+
+  setup do
+    build_app
+    add_to_config "config.consider_all_requests_local = true"
+
+    app_file "app/models/customer.rb", <<-RUBY
+      class Customer < Struct.new(:name, :id)
+        extend ActiveModel::Naming
+        include ActiveModel::Conversion
+
+        def cache_key
+          [ name, id ].join("/")
+        end
+      end
+    RUBY
+
+    app_file "config/routes.rb", <<-RUBY
+      Rails.application.routes.draw do
+        resources :customers, only: :index
+      end
+    RUBY
+
+    app_file "app/controllers/customers_controller.rb", <<-RUBY
+      class CustomersController < ApplicationController
+        self.perform_caching = true
+
+        def index
+          render [ Customer.new('david', 1), Customer.new('dingus', 2) ]
+        end
+      end
+    RUBY
+
+    app_file "app/views/customers/_customer.html.erb", <<-RUBY
+      <% cache customer do %>
+        <%= customer.name %>
+      <% end %>
+    RUBY
+
+    require "#{app_path}/config/environment"
+  end
+
+  teardown :teardown_app
+
+  test "digests are reused when rendering the same template twice" do
+    get "/customers"
+    assert_equal 200, last_response.status
+
+    values = ActionView::LookupContext::DetailsKey.digest_caches.first.values
+    assert_equal [ "effc8928d0b33535c8a21d24ec617161" ], values
+    assert_equal %w(david dingus), last_response.body.split.map(&:strip)
+  end
+
+  test "template digests are cleared before a request" do
+    assert_called(ActionView::LookupContext::DetailsKey, :clear) do
+      get "/customers"
+      assert_equal 200, last_response.status
+    end
+  end
+end