1 files changed, 10 insertions, 0 deletions
diff --git a/actionview/test/template/lookup_context_test.rb b/actionview/test/template/lookup_context_test.rb
index 290f832794..5298afb694 100644
--- a/actionview/test/template/lookup_context_test.rb
+++ b/actionview/test/template/lookup_context_test.rb
@@ -17,6 +17,16 @@ class LookupContextTest < ActiveSupport::TestCase
     I18n.locale = :en
   end
 
+  test "rendered_format is deprecated" do
+    assert_deprecated do
+      @lookup_context.rendered_format = "foo"
+    end
+
+    assert_deprecated do
+      assert_equal "foo", @lookup_context.rendered_format
+    end
+  end
+
   test "allows to override default_formats with ActionView::Base.default_formats" do
     formats = ActionView::Base.default_formats
     ActionView::Base.default_formats = [:foo, :bar]