merge revision(s) 53381,53382,53511,53512: [Backport #11916]

	* lib/forwardable.rb (def_instance_delegator) fix delegating to
	  'args' and 'block', clashing with local variables in generated
	  methods.  [ruby-core:72579] [Bug #11916]

	* lib/forwardable.rb (def_single_delegator): ditto.

	* lib/forwardable.rb: Convert given accessors to String.
	  r53381 changed to accept only Symbol or String for accessors, but
	  there are several rubygems that pass classes (e.g. Array,
	  Hash, ...) as accessors. Prior r53381, it was accepted because Class#to_s
	  returns its class name. After r53381 given accessors are checked
	  with define_method, but it accepts only Symbol or String, otherwise
	  raises TypeError.
	      def_delegator Foo, :some_method
	  This change is to revert unwanted incompatibility. But this behavior
	  may change in the future.
	  This change is to revert unexpected incompatibility. But this behavior


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_2@54673 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 229 insertions, 0 deletions

diff --git a/test/test_forwardable.rb b/test/test_forwardable.rb
new file mode 100644
index 0000000000..69372d6936
--- /dev/null
+++ b/test/test_forwardable.rb
@@ -0,0 +1,229 @@
+# frozen_string_literal: false
+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_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_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_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
+    def_delegator :caller, :itself, :c
+
+    class Exception
+    end
+  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
+end