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|
# frozen_string_literal: false
require 'test/unit'
require 'forwardable'
class TestForwardable < Test::Unit::TestCase
INTEGER = 42
RECEIVER = BasicObject.new
RETURNED1 = BasicObject.new
RETURNED2 = BasicObject.new
class << RECEIVER
def delegated1
RETURNED1
end
def delegated2
RETURNED2
end
def delegated1_kw(**kw)
[RETURNED1, kw]
end
end
def test_def_instance_delegator
%i[def_delegator def_instance_delegator].each do |m|
ret = nil
cls = forwardable_class do
ret = __send__ m, :@receiver, :delegated1
end
assert_same RETURNED1, cls.new.delegated1
assert_equal :delegated1, ret
end
end
def test_def_instance_delegator_constant
%i[def_delegator def_instance_delegator].each do |m|
cls = forwardable_class do
__send__ m, 'TestForwardable::INTEGER', :to_i
end
assert_equal 42, cls.new.to_i
end
end
def test_def_instance_delegator_kw
%i[def_delegator def_instance_delegator].each do |m|
cls = forwardable_class do
__send__ m, :@receiver, :delegated1_kw
end
ary = cls.new.delegated1_kw b: 1
assert_same RETURNED1, ary[0]
assert_equal({b: 1}, ary[1])
end
end
def test_def_instance_delegator_using_args_method_as_receiver
%i[def_delegator def_instance_delegator].each do |m|
cls = forwardable_class(
receiver_name: :args,
type: :method,
visibility: :private
) do
__send__ m, :args, :delegated1
end
assert_same RETURNED1, cls.new.delegated1
end
end
def test_def_instance_delegator_using_block_method_as_receiver
%i[def_delegator def_instance_delegator].each do |m|
cls = forwardable_class(
receiver_name: :block,
type: :method,
visibility: :private
) do
__send__ m, :block, :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_def_instance_delegators_using_args_method_as_receiver
%i[def_delegators def_instance_delegators].each do |m|
cls = forwardable_class(
receiver_name: :args,
type: :method,
visibility: :private
) do
__send__ m, :args, :delegated1, :delegated2
end
assert_same RETURNED1, cls.new.delegated1
assert_same RETURNED2, cls.new.delegated2
end
end
def test_def_instance_delegators_using_block_method_as_receiver
%i[def_delegators def_instance_delegators].each do |m|
cls = forwardable_class(
receiver_name: :block,
type: :method,
visibility: :private
) do
__send__ m, :block, :delegated1, :delegated2
end
assert_same RETURNED1, cls.new.delegated1
assert_same RETURNED2, cls.new.delegated2
end
end
def test_def_instance_delegators_send_id
%i[def_delegators def_instance_delegators].each do |m|
cls = forwardable_class do
attr_reader :receiver
__send__ m, :@receiver, :__send__, :__id__
end
assert_not_equal cls.new.__id__, cls.new.receiver.__id__
assert_not_equal cls.new.__send__(:__id__), cls.new.receiver.__send__(:__id__)
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_instance_delegate_using_args_method_as_receiver
%i[delegate instance_delegate].each do |m|
cls = forwardable_class(
receiver_name: :args,
type: :method,
visibility: :private
) do
__send__ m, delegated1: :args, delegated2: :args
end
assert_same RETURNED1, cls.new.delegated1
assert_same RETURNED2, cls.new.delegated2
end
end
def test_def_instance_delegate_using_block_method_as_receiver
%i[delegate instance_delegate].each do |m|
cls = forwardable_class(
receiver_name: :block,
type: :method,
visibility: :private
) do
__send__ m, delegated1: :block, delegated2: :block
end
assert_same RETURNED1, cls.new.delegated1
assert_same RETURNED2, cls.new.delegated2
end
end
def test_class_single_delegator
%i[def_delegator def_single_delegator].each do |m|
ret = nil
cls = single_forwardable_class do
ret = __send__ m, :@receiver, :delegated1
end
assert_same RETURNED1, cls.delegated1
assert_equal :delegated1, ret
end
end
def test_class_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_class_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
def test_obj_single_delegator
%i[def_delegator def_single_delegator].each do |m|
obj = single_forwardable_object do
__send__ m, :@receiver, :delegated1
end
assert_same RETURNED1, obj.delegated1
end
end
def test_obj_single_delegators
%i[def_delegators def_single_delegators].each do |m|
obj = single_forwardable_object do
__send__ m, :@receiver, :delegated1, :delegated2
end
assert_same RETURNED1, obj.delegated1
assert_same RETURNED2, obj.delegated2
end
end
def test_obj_single_delegators_send_id
%i[def_delegators def_single_delegators].each do |m|
obj = single_forwardable_object do
singleton_class.__send__ :attr_reader, :receiver
__send__ m, :@receiver, :__send__, :__id__
end
assert_not_equal obj.__id__, obj.receiver.__id__
assert_not_equal obj.__send__(:__id__), obj.receiver.__send__(:__id__)
end
end
def test_obj_single_delegate
%i[delegate single_delegate].each do |m|
obj = single_forwardable_object do
__send__ m, delegated1: :@receiver, delegated2: :@receiver
end
assert_same RETURNED1, obj.delegated1
assert_same RETURNED2, obj.delegated2
obj = single_forwardable_object do
__send__ m, %i[delegated1 delegated2] => :@receiver
end
assert_same RETURNED1, obj.delegated1
assert_same RETURNED2, obj.delegated2
end
end
class Foo
extend Forwardable
attr_accessor :bar
def_delegator :bar, :baz
def_delegator :caller, :itself, :c
end
def test_backtrace_adjustment
obj = Foo.new
def (obj.bar = Object.new).baz
foo
end
e = assert_raise(NameError) {
obj.baz
}
assert_not_match(/\/forwardable\.rb/, e.backtrace[0],
proc {RubyVM::InstructionSequence.of(obj.method(:baz)).disassemble})
assert_equal(caller(0, 1)[0], Foo.new.c[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
def test_aref
obj = Object.new.extend SingleForwardable
obj.instance_variable_set("@h", {foo: 42})
obj.def_delegator("@h", :[])
assert_equal(42, obj[:foo])
end
def test_aset
obj = Object.new.extend SingleForwardable
obj.instance_variable_set("@h", h = {foo: 0})
obj.def_delegator("@h", :[]=)
obj[:foo] = 42
assert_equal(42, h[:foo])
end
def test_binop
obj = Object.new.extend SingleForwardable
obj.instance_variable_set("@h", 40)
obj.def_delegator("@h", :+)
assert_equal(42, obj+2)
end
def test_uniop
obj = Object.new.extend SingleForwardable
obj.instance_variable_set("@h", -42)
obj.def_delegator("@h", :-@)
assert_equal(42, -obj)
end
def test_on_private_method
cls = Class.new do
private def foo; :foo end
extend Forwardable
def_delegator :itself, :foo, :bar
end
assert_warn(/forwarding to private method/) do
assert_equal(:foo, cls.new.bar)
end
end
def test_non_module
str = String.new
str.extend Forwardable
str.instance_variable_set("@h", 42)
str.def_delegator("@h", :to_s, :forty_two)
assert_equal("42", str.forty_two)
end
private
def forwardable_class(
receiver_name: :receiver,
type: :ivar,
visibility: :public,
&block
)
Class.new do
extend Forwardable
define_method(:initialize) do
instance_variable_set("@#{receiver_name}", RECEIVER)
end
if type == :method
attr_reader(receiver_name)
__send__(visibility, receiver_name)
end
class_exec(&block)
end
end
def single_forwardable_class(&block)
Class.new do
extend SingleForwardable
@receiver = RECEIVER
class_exec(&block)
end
end
def single_forwardable_object(&block)
obj = Object.new.extend SingleForwardable
obj.instance_variable_set(:@receiver, RECEIVER)
obj.instance_eval(&block)
obj
end
end
|
