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require 'singleton' require 'test/unit' if RUBY_PLATFORM =~ /java/ require 'jruby' JRuby.objectspace = true end class ASingletonClass include Singleton end class TestSingleton < Test::Unit::TestCase def setup @a = ASingletonClass.instance @b = ASingletonClass.instance @c = Marshal.load(Marshal.dump(@a)) end def test_two_instances_are_the_same_for_real assert_equal(true, @a.equal?(@b)) end def test_deserialized_instance_should_be_an_instance_of_that_class assert_kind_of(ASingletonClass, @c) end def test_deserialized_instance_should_be_THE_instance_for_real assert_equal(true, @a.equal?(@c)) end def test_there_should_only_be_one_instance assert_equal(1, ObjectSpace.each_object(ASingletonClass){}) end end

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