[ruby/forwardable] Fix keyword argument separation warnings on Ruby 2.7+

Do so in a way that is also compatible with previous versions.

https://github.com/ruby/forwardable/commit/b2dd340988

1 files changed, 16 insertions, 0 deletions

diff --git a/test/test_forwardable.rb b/test/test_forwardable.rb
index 2c0face3ba..dc1408e8ed 100644
--- a/test/test_forwardable.rb
+++ b/test/test_forwardable.rb
@@ -16,6 +16,10 @@ class TestForwardable < Test::Unit::TestCase
     def delegated2
       RETURNED2
     end
+
+    def delegated1_kw(**kw)
+      [RETURNED1, kw]
+    end
   end
 
   def test_def_instance_delegator
@@ -38,6 +42,18 @@ class TestForwardable < Test::Unit::TestCase
     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(