ruby--ruby/test/fiddle/test_c_union_entity.rb

# frozen_string_literal: true
begin
  require_relative 'helper'
  require 'fiddle/struct'
rescue LoadError
end


module Fiddle
  class TestCUnionEntity < TestCase
    def test_class_size
      size = CUnionEntity.size([TYPE_DOUBLE, TYPE_CHAR])

      assert_equal SIZEOF_DOUBLE, size
    end

    def test_class_size_with_count
      size = CUnionEntity.size([[TYPE_DOUBLE, 2], [TYPE_CHAR, 20]])

      assert_equal SIZEOF_CHAR * 20, size
    end

    def test_set_ctypes
      CUnionEntity.malloc([TYPE_INT, TYPE_LONG], Fiddle::RUBY_FREE) do |union|
        union.assign_names %w[int long]

        # this test is roundabout because the stored ctypes are not accessible
        union['long'] = 1
        assert_equal 1, union['long']

        union['int'] = 1
        assert_equal 1, union['int']
      end
    end
  end
end if defined?(Fiddle)