Add EPP contact:delete used spec

#328

spec/requests/epp/contact/delete/used_spec.rb

@@ -0,0 +1,49 @@
+require 'rails_helper'
+
+RSpec.describe 'EPP contact:delete' do
+  let(:user) { create(:api_user, registrar: registrar) }
+  let(:registrar) { create(:registrar) }
+  let!(:registrant) { create(:registrant, registrar: registrar, code: 'TEST') }
+  let(:request) { post '/epp/command/delete', frame: request_xml }
+  let(:request_xml) { <<-XML
+    <?xml version="1.0" encoding="UTF-8" standalone="no"?>
+    <epp xmlns="https://epp.tld.ee/schema/epp-ee-1.0.xsd">
+      <command>
+        <delete>
+          <contact:delete xmlns:contact="https://epp.tld.ee/schema/contact-ee-1.1.xsd">
+            <contact:id>test</contact:id>
+          </contact:delete>
+        </delete>
+      </command>
+    </epp>
+  XML
+  }
+
+  before do
+    sign_in_to_epp_area(user: user)
+  end
+
+  context 'when contact is used' do
+    let!(:domain) { create(:domain, registrant: registrant) }
+
+    specify do
+      request
+      expect(response).to have_code_of(2305)
+    end
+
+    it 'does not delete contact' do
+      expect { request }.to_not change { Contact.count }
+    end
+  end
+
+  context 'when contact is not used' do
+    specify do
+      request
+      expect(response).to have_code_of(1000)
+    end
+
+    it 'deletes contact' do
+      expect { request }.to change { Contact.count }.from(1).to(0)
+    end
+  end
+end