Add failing test

Author: marshall-lee

spec/grape_entity/entity_spec.rb

@@ -272,6 +272,15 @@ class Parent < Person
           expect(subject.represent({ name: 'bar' }, serializable: true)).to eq(email: nil, name: 'bar')
           expect(child_class.represent({ name: 'bar' }, serializable: true)).to eq(email: nil, name: 'foo')
         end
+
+        it 'supports class reopening' do
+          subject.expose :name
+          child_class = Class.new(subject)
+          subject.expose :email
+
+          expect(subject.represent({ name: 'bar', email: 'foo@bar' }, serializable: true)).to eq(email: 'foo@bar', name: 'bar')
+          expect(child_class.represent({ name: 'bar', email: 'foo@bar' }, serializable: true)).to eq(email: 'foo@bar', name: 'foo')
+        end
       end
 
       context 'register formatters' do