1 files changed, 10 insertions, 1 deletions
diff --git a/actionview/test/template/render_test.rb b/actionview/test/template/render_test.rb
index a0b493af9d..e36babfd25 100644
--- a/actionview/test/template/render_test.rb
+++ b/actionview/test/template/render_test.rb
@@ -33,7 +33,16 @@ module RenderTestCases
   def test_implicit_format_comes_from_parent_template
     rendered_templates = JSON.parse(@controller_view.render(template: "test/mixing_formats"))
     assert_equal({ "format" => "HTML",
-                   "children" => ["XML", "HTML"]}, rendered_templates)
+                   "children" => ["XML", "HTML"] }, rendered_templates)
+  end
+
+  def test_implicit_format_comes_from_parent_template_cascading
+    rendered_templates = JSON.parse(@controller_view.render(template: "test/mixing_formats_deep"))
+    assert_equal({ "format" => "HTML",
+                   "children" => [
+                     { "format" => "XML", "children" => ["XML"] },
+                     { "format" => "HTML", "children" => ["HTML"] },
+    ] }, rendered_templates)
   end
 
   def test_render_without_options