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# frozen_string_literal: false
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_raise NoMethodError do
SingletonTest.new
end
end
def test_allocate_raises_exception
assert_raise NoMethodError do
SingletonTest.allocate
end
end
def test_clone_raises_exception
exception = assert_raise 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_raise 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_raise 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_raise 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
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