remove_method of Module is private at Ruby 2.3 and 2.4

Author: hsbt

tests/json_generator_test.rb

@@ -396,7 +396,7 @@ def test_string_ext_included_calls_super
       included = false
 
       Module.send(:alias_method, :included_orig, :included)
-      Module.remove_method(:included)
+      Module.send(:remove_method, :included)
       Module.define_method(:included) do |base|
         included_orig(base)
         included = true
@@ -409,9 +409,9 @@ def test_string_ext_included_calls_super
       assert included
     ensure
       if Module.private_method_defined?(:included_orig)
-        Module.remove_method(:included) if Module.method_defined?(:included)
+        Module.send(:remove_method, :included) if Module.method_defined?(:included)
         Module.send(:alias_method, :included, :included_orig)
-        Module.remove_method(:included_orig)
+        Module.send(:remove_method, :included_orig)
       end
     end
   end