Specify desired state in unit spec

spec/unit/shoulda/matchers/independent/delegate_method_matcher_spec.rb

@@ -102,6 +102,15 @@ def country
           end
         end
       end
+
+      context 'qualified with #with_private' do
+        it 'states that it should delegate method to the right object with right argument and makes is private' do
+          matcher = delegate_method(:method_name).to(:delegate).with_private
+          message = 'delegate #method_name to the #delegate object privately'
+
+          expect(matcher.description).to eq message
+        end
+      end
     end
 
     context 'when the subject is a class' do
@@ -655,4 +664,46 @@ def hello
       end
     end
   end
+
+  context 'qualified with #with_private' do
+    context 'when using delegate from Rails' do
+      context 'when delegations were defined with :private' do
+        it 'accepts' do
+          define_class('Person') do
+            delegate :hello, to: :country, private: true
+            def country
+            end
+          end
+
+          person = Person.new
+
+          expect(person).to delegate_method(:hello).to(:country).with_private
+        end
+      end
+
+      context 'when delegations were not defined with :private' do
+        it 'rejects with the correct failure message' do
+          define_class('Person') do
+            delegate :hello, to: :country
+            def country
+            end
+          end
+
+          person = Person.new
+
+          message = <<-MESSAGE
+Expected Person to delegate #hello to the #country object privately.
+
+Person#hello did delegate to #country, but 'private: true' is missing.
+          MESSAGE
+
+          expectation = lambda do
+            expect(person).to delegate_method(:hello).to(:country).with_private
+          end
+
+          expect(&expectation).to fail_with_message(message)
+        end
+      end
+    end
+  end
 end