actionpack/test/controller/parameters/dup_test.rb


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require "abstract_unit"
require "action_controller/metal/strong_parameters"

class ParametersDupTest < ActiveSupport::TestCase
  setup do
    ActionController::Parameters.permit_all_parameters = false

    @params = ActionController::Parameters.new(
      person: {
        age: "32",
        name: {
          first: "David",
          last: "Heinemeier Hansson"
        },
        addresses: [{city: "Chicago", state: "Illinois"}]
      }
    )
  end

  test "a duplicate maintains the original's permitted status" do
    @params.permit!
    dupped_params = @params.dup
    assert dupped_params.permitted?
  end

  test "a duplicate maintains the original's parameters" do
    @params.permit!
    dupped_params = @params.dup
    assert_equal @params.to_h, dupped_params.to_h
  end

  test "changes to a duplicate's parameters do not affect the original" do
    dupped_params = @params.dup
    dupped_params.delete(:person)
    assert_not_equal @params, dupped_params
  end

  test "changes to a duplicate's permitted status do not affect the original" do
    dupped_params = @params.dup
    dupped_params.permit!
    assert_not_equal @params, dupped_params
  end
end