ruby--ruby/test/ruby/test_struct.rb

require 'test/unit'

class TestStruct < Test::Unit::TestCase
  def test_struct
    struct_test = Struct.new("Test", :foo, :bar)
    assert_equal(Struct::Test, struct_test)

    test = struct_test.new(1, 2)
    assert_equal(1, test.foo)
    assert_equal(2, test.bar)
    assert_equal(1, test[0])
    assert_equal(2, test[1])

    a, b = test.to_a
    assert_equal(1, a)
    assert_equal(2, b)

    test[0] = 22
    assert_equal(22, test.foo)

    test.bar = 47
    assert_equal(47, test.bar)
  end

  # [ruby-dev:26247] more than 10 struct members causes segmentation fault
  def test_morethan10members
    list = %w( a b c d  e f g h  i j k l  m n o p )
    until list.empty?
      c = Struct.new(* list.map {|ch| ch.intern }).new
      list.each do |ch|
        c.__send__(ch)
      end
      list.pop
    end
  end

  def test_small_structs
    names = [:a, :b, :c, :d]
    1.upto(4) {|n|
      fields = names[0, n]
      klass = Struct.new(*fields)
      o = klass.new(*(0...n).to_a)
      fields.each_with_index {|name, i|
        assert_equal(i, o[name])
      }
      o = klass.new(*(0...n).to_a.reverse)
      fields.each_with_index {|name, i|
        assert_equal(n-i-1, o[name])
      }
    }
  end
end