activemodel/test/cases/type/string_test.rb


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# frozen_string_literal: true
require "cases/helper"
require "active_model/type"

module ActiveModel
  module Type
    class StringTest < ActiveModel::TestCase
      test "type casting" do
        type = Type::String.new
        assert_equal "t", type.cast(true)
        assert_equal "f", type.cast(false)
        assert_equal "123", type.cast(123)
      end

      test "cast strings are mutable" do
        type = Type::String.new

        s = "foo".dup
        assert_equal false, type.cast(s).frozen?
        assert_equal false, s.frozen?

        f = "foo".freeze
        assert_equal false, type.cast(f).frozen?
        assert_equal true, f.frozen?
      end

      test "values are duped coming out" do
        type = Type::String.new

        s = "foo"
        assert_not_same s, type.cast(s)
        assert_equal s, type.cast(s)
        assert_not_same s, type.deserialize(s)
        assert_equal s, type.deserialize(s)
      end
    end
  end
end