AC::Parameters#at_json: restore Rails 4.2’s value

Fixes #23026

See discussion at #23026

1 files changed, 6 insertions, 0 deletions

diff --git a/actionpack/test/controller/parameters/accessors_test.rb b/actionpack/test/controller/parameters/accessors_test.rb
index 97875c3cbb..a8f4d877a6 100644
--- a/actionpack/test/controller/parameters/accessors_test.rb
+++ b/actionpack/test/controller/parameters/accessors_test.rb
@@ -27,6 +27,12 @@ class ParametersAccessorsTest < ActiveSupport::TestCase
     assert_not @params[:person][:name].permitted?
   end
 
+  test "as_json returns the JSON representation of the parameters hash" do
+    assert_not @params.as_json.key? "parameters"
+    assert_not @params.as_json.key? "permitted"
+    assert @params.as_json.key? "person"
+  end
+
   test "each carries permitted status" do
     @params.permit!
     @params.each { |key, value| assert(value.permitted?) if key == "person" }