Contact renew command returns appropriate error

spec/epp/contact_spec.rb

@@ -236,5 +236,14 @@ describe 'EPP Contact', epp: true do
         expect(response[:msg]).to eq('Authorization error')
       end
     end
+
+    context 'renew command' do
+      it 'returns 2101-unimplemented command' do
+        response = epp_request('contacts/renew.xml')
+
+        expect(response[:result_code]).to eq('2101')
+        expect(response[:msg]).to eq('Unimplemented command')
+      end
+    end
   end
 end

spec/epp/requests/contacts/renew.xml

@@ -0,0 +1,15 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+  <epp xmlns="urn:ietf:params:xml:ns:epp-1.0">
+    <command>
+      <renew>
+        <contact:renew
+         xmlns:contact="urn:ietf:params:xml:ns:contact-1.0">
+          <contact:id>info-4444</contact:id>
+          <contact:authInfo>
+            <contact:pw>2fooBAR</contact:pw>
+          </contact:authInfo>
+       </contact:renew>
+      </renew>
+      <clTRID>ABC-12345</clTRID>
+    </command>
+  </epp>