Vital Ruby Lab 6

attr_flag.rb

class Module
  def attr_flag(*names)
    names.each do |name|
      module_eval "def #{name}?(); @#{name}; end"
    end
  end
end

attr_flag_test.rb

require 'test/unit'
require 'attr_flag'

class AttrFlagTest < Test::Unit::TestCase
  class X
    attr_accessor :ok
    attr_flag :ok
    attr_flag :a, :b, :c

    def initialize
      @a = @b = @c = true
    end
  end

  def test_flag_is_true
    x = X.new
    x.ok = true
    assert x.ok?
  end

  def test_flag_is_false
    x = X.new
    x.ok = false
    assert ! x.ok?
  end

  def test_defines_multiple_names
    x = X.new
    assert x.a?
    assert x.b?
    assert x.c?
  end
end

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