1 files changed, 6 insertions, 0 deletions
diff --git a/actionpack/test/dispatch/show_exceptions_test.rb b/actionpack/test/dispatch/show_exceptions_test.rb
index f802abc653..6fafa4e426 100644
--- a/actionpack/test/dispatch/show_exceptions_test.rb
+++ b/actionpack/test/dispatch/show_exceptions_test.rb
@@ -9,6 +9,8 @@ class ShowExceptionsTest < ActionDispatch::IntegrationTest
       case req.path
       when "/not_found"
         raise AbstractController::ActionNotFound
+      when "/invalid_mimetype"
+        raise Mime::Type::InvalidMimeType
       when "/bad_params", "/bad_params.json"
         begin
           raise StandardError.new
@@ -62,6 +64,10 @@ class ShowExceptionsTest < ActionDispatch::IntegrationTest
     get "/unknown_http_method", env: { "action_dispatch.show_exceptions" => true }
     assert_response 405
     assert_equal "", body
+
+    get "/invalid_mimetype", headers: { "Accept" => "text/html,*", "action_dispatch.show_exceptions" => true }
+    assert_response 406
+    assert_equal "", body
   end
 
   test "localize rescue error page" do