1 files changed, 70 insertions, 0 deletions
diff --git a/railties/test/application/middleware/static_test.rb b/railties/test/application/middleware/static_test.rb
new file mode 100644
index 0000000000..0977042cfe
--- /dev/null
+++ b/railties/test/application/middleware/static_test.rb
@@ -0,0 +1,70 @@
+# frozen_string_literal: true
+
+require "isolation/abstract_unit"
+require "rack/test"
+
+module ApplicationTests
+  class MiddlewareStaticTest < ActiveSupport::TestCase
+    include ActiveSupport::Testing::Isolation
+    include Rack::Test::Methods
+
+    def setup
+      build_app
+      FileUtils.rm_rf "#{app_path}/config/environments"
+    end
+
+    def teardown
+      teardown_app
+    end
+
+    # Regression test to #8907
+    # See https://github.com/rails/rails/commit/9cc82b77196d21a5c7021f6dca59ab9b2b158a45#commitcomment-2416514
+    test "doesn't set Cache-Control header when it is nil" do
+      app_file "public/foo.html", "static"
+
+      require "#{app_path}/config/environment"
+
+      get "foo"
+
+      assert_not last_response.headers.has_key?("Cache-Control"), "Cache-Control should not be set"
+    end
+
+    test "headers for static files are configurable" do
+      app_file "public/about.html", "static"
+      add_to_config <<-CONFIG
+        config.public_file_server.headers = {
+          "Access-Control-Allow-Origin" => "http://rubyonrails.org",
+          "Cache-Control"               => "public, max-age=60"
+        }
+      CONFIG
+
+      require "#{app_path}/config/environment"
+
+      get "/about.html"
+
+      assert_equal "http://rubyonrails.org", last_response.headers["Access-Control-Allow-Origin"]
+      assert_equal "public, max-age=60",     last_response.headers["Cache-Control"]
+    end
+
+    test "public_file_server.index_name defaults to 'index'" do
+      app_file "public/index.html", "/index.html"
+
+      require "#{app_path}/config/environment"
+
+      get "/"
+
+      assert_equal "/index.html\n", last_response.body
+    end
+
+    test "public_file_server.index_name configurable" do
+      app_file "public/other-index.html", "/other-index.html"
+      add_to_config "config.public_file_server.index_name = 'other-index'"
+
+      require "#{app_path}/config/environment"
+
+      get "/"
+
+      assert_equal "/other-index.html\n", last_response.body
+    end
+  end
+end