test_forwardable.rb: operators

* test/test_forwardable.rb: add tests for operators.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@55369 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

test/test_forwardable.rb

@@ -253,6 +253,35 @@ class TestForwardable < Test::Unit::TestCase
     }
   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
+
   private
 
   def forwardable_class(