rails--rails/activesupport/test/hash_with_indifferent_access_test.rb

require 'abstract_unit'
require 'active_support/hash_with_indifferent_access'

class HashWithIndifferentAccessTest < ActiveSupport::TestCase
  def test_reverse_merge
    hash = HashWithIndifferentAccess.new key: :old_value
    hash.reverse_merge! key: :new_value
    assert_equal :old_value, hash[:key]
  end

end