Add support for detecting refinement support

Author: JonRowe

lib/rspec/support/ruby_features.rb

@@ -141,6 +141,10 @@ def supports_rebinding_module_methods?
         # rubocop:enable Lint/Eval
       end
 
+      def module_refinement_supported?
+        Module.method_defined?(:refine) || Module.private_method_defined?(:refine)
+      end
+
       def module_prepends_supported?
         Module.method_defined?(:prepend) || Module.private_method_defined?(:prepend)
       end

spec/rspec/support/ruby_features_spec.rb

@@ -59,6 +59,12 @@ module Support
     end
 
     describe RubyFeatures do
+      specify "#module_refinedment_supported? reflects refinement support" do
+        if Ruby.mri? && RUBY_VERSION >= '2.1.0'
+          expect(RubyFeatures.module_refinement_supported?).to eq true
+        end
+      end
+
       specify "#supports_exception_cause? exists" do
         RubyFeatures.supports_exception_cause?
       end