activemodel/test/cases/type/immutable_string_test.rb


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# frozen_string_literal: true

require "cases/helper"

module ActiveModel
  module Type
    class ImmutableStringTest < ActiveSupport::TestCase
      test "cast strings are frozen" do
        s = "foo"
        type = Type::ImmutableString.new
        assert_equal true, type.cast(s).frozen?
      end

      test "immutable strings are not duped coming out" do
        s = "foo"
        type = Type::ImmutableString.new
        assert_same s, type.cast(s)
        assert_same s, type.deserialize(s)
      end
    end
  end
end