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Diffstat (limited to 'jni/ruby/test/test_singleton.rb')
-rw-r--r-- | jni/ruby/test/test_singleton.rb | 103 |
1 files changed, 103 insertions, 0 deletions
diff --git a/jni/ruby/test/test_singleton.rb b/jni/ruby/test/test_singleton.rb new file mode 100644 index 0000000..259f9c5 --- /dev/null +++ b/jni/ruby/test/test_singleton.rb @@ -0,0 +1,103 @@ +require 'test/unit' +require 'singleton' + +class TestSingleton < Test::Unit::TestCase + class SingletonTest + include Singleton + end + + def test_marshal + o1 = SingletonTest.instance + m = Marshal.dump(o1) + o2 = Marshal.load(m) + assert_same(o1, o2) + end + + def test_instance_never_changes + a = SingletonTest.instance + b = SingletonTest.instance + assert_same a, b + end + + def test_initialize_raises_exception + assert_raises NoMethodError do + SingletonTest.new + end + end + + def test_allocate_raises_exception + assert_raises NoMethodError do + SingletonTest.allocate + end + end + + def test_clone_raises_exception + exception = assert_raises TypeError do + SingletonTest.instance.clone + end + + expected = "can't clone instance of singleton TestSingleton::SingletonTest" + + assert_equal expected, exception.message + end + + def test_dup_raises_exception + exception = assert_raises TypeError do + SingletonTest.instance.dup + end + + expected = "can't dup instance of singleton TestSingleton::SingletonTest" + + assert_equal expected, exception.message + end + + def test_include_in_module_raises_exception + mod = Module.new + + exception = assert_raises TypeError do + mod.class_eval do + include Singleton + end + end + + expected = "Inclusion of the OO-Singleton module in module #{mod}" + + assert_equal expected, exception.message + end + + def test_extending_singleton_raises_exception + assert_raises NoMethodError do + 'foo'.extend Singleton + end + end + + def test_inheritance_works_with_overridden_inherited_method + super_super_called = false + + outer = Class.new do + define_singleton_method :inherited do |sub| + super_super_called = true + end + end + + inner = Class.new(outer) do + include Singleton + end + + tester = Class.new(inner) + + assert super_super_called + + a = tester.instance + b = tester.instance + assert_same a, b + end + + def test_class_level_cloning_preserves_singleton_behavior + klass = SingletonTest.clone + + a = klass.instance + b = klass.instance + assert_same a, b + end +end |