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require 'test/unit'
require 'forwardable'
class TestForwardable < Test::Unit::TestCase
RECEIVER = BasicObject.new
RETURNED1 = BasicObject.new
RETURNED2 = BasicObject.new
class << RECEIVER
def delegated1
RETURNED1
end
def delegated2
RETURNED2
end
end
def test_def_instance_delegator
%i[def_delegator def_instance_delegator].each do |m|
cls = forwardable_class do
__send__ m, :@receiver, :delegated1
end
assert_same RETURNED1, cls.new.delegated1
end
end
def test_def_instance_delegators
%i[def_delegators def_instance_delegators].each do |m|
cls = forwardable_class do
__send__ m, :@receiver, :delegated1, :delegated2
end
assert_same RETURNED1, cls.new.delegated1
assert_same RETURNED2, cls.new.delegated2
end
end
def test_instance_delegate
%i[delegate instance_delegate].each do |m|
cls = forwardable_class do
__send__ m, delegated1: :@receiver, delegated2: :@receiver
end
assert_same RETURNED1, cls.new.delegated1
assert_same RETURNED2, cls.new.delegated2
cls = forwardable_class do
__send__ m, %i[delegated1 delegated2] => :@receiver
end
assert_same RETURNED1, cls.new.delegated1
assert_same RETURNED2, cls.new.delegated2
end
end
def test_def_single_delegator
%i[def_delegator def_single_delegator].each do |m|
cls = single_forwardable_class do
__send__ m, :@receiver, :delegated1
end
assert_same RETURNED1, cls.delegated1
end
end
def test_def_single_delegators
%i[def_delegators def_single_delegators].each do |m|
cls = single_forwardable_class do
__send__ m, :@receiver, :delegated1, :delegated2
end
assert_same RETURNED1, cls.delegated1
assert_same RETURNED2, cls.delegated2
end
end
def test_single_delegate
%i[delegate single_delegate].each do |m|
cls = single_forwardable_class do
__send__ m, delegated1: :@receiver, delegated2: :@receiver
end
assert_same RETURNED1, cls.delegated1
assert_same RETURNED2, cls.delegated2
cls = single_forwardable_class do
__send__ m, %i[delegated1 delegated2] => :@receiver
end
assert_same RETURNED1, cls.delegated1
assert_same RETURNED2, cls.delegated2
end
end
class Foo
extend Forwardable
def_delegator :bar, :baz
class Exception
end
end
def test_backtrace_adjustment
e = assert_raise(NameError) {
Foo.new.baz
}
assert_not_match(/\/forwardable\.rb/, e.backtrace[0])
end
class Foo2 < BasicObject
extend ::Forwardable
def_delegator :bar, :baz
end
def test_basicobject_subclass
bug11616 = '[ruby-core:71176] [Bug #11616]'
assert_raise_with_message(NameError, /`bar'/, bug11616) {
Foo2.new.baz
}
end
private
def forwardable_class(&block)
Class.new do
extend Forwardable
def initialize
@receiver = RECEIVER
end
class_exec(&block)
end
end
def single_forwardable_class(&block)
Class.new do
extend SingleForwardable
@receiver = RECEIVER
class_exec(&block)
end
end
end
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