Update to use new Registers API response format

The response you receive from a request for the `/records` endpoint is
changing. This will be a breaking change. This change provides support
for both the old and new response style whilst we transition.

The biggest change here is the addition of a list of items under the
`item` [sic] key within each record. For the Country Register this will
only contain a single item.

app/jobs/fetch_country_register_job.rb

@@ -26,7 +26,12 @@ def perform(*args)
   private
 
   def countries
-    fetch_register.body.values
+    values = fetch_register.body.values
+    if !values.empty? && values.first.has_key?('item')
+      values.map { |x| x['item'].first }
+    else
+      values
+    end
   end
 
   def faraday

spec/jobs/fetch_petition_register_job_spec.rb

@@ -13,7 +13,155 @@ def json_error(status = 404, body = "{}")
     {status: status, headers: {"Content-Type" => "application/json"}, body: body}
   end
 
-  context "new (map-based) record schema" do
+  context "latest record schema" do
+    context "when a country does not exist" do
+      before do
+        stub_register.to_return json_response <<-JSON
+        {
+            "GB" : {
+              "index-entry-number": "6",
+              "entry-number": "6",
+              "entry-timestamp": "2016-04-05T13:23:05Z",
+              "key": "GB",
+              "item": [{
+                "citizen-names": "Briton;British citizen",
+                "country": "GB",
+                "name": "United Kingdom",
+                "official-name": "The United Kingdom of Great Britain and Northern Ireland",
+                "start-date": "1707-05-01",
+                "end-date": "2017-12-31"
+              }]
+            }
+        }
+        JSON
+      end
+
+      it "creates a record" do
+        expect {
+          perform_enqueued_jobs {
+            described_class.perform_later
+          }
+        }.to change { Location.count }.by(1)
+      end
+
+      describe "attribute assignment" do
+        let(:location) { Location.find_by!(code: "GB") }
+
+        before do
+          perform_enqueued_jobs {
+            described_class.perform_later
+          }
+        end
+
+        it "assigns 'country' to Location#code" do
+          expect(location.code).to eq("GB")
+        end
+
+        it "assigns 'name' to Location#name" do
+          expect(location.name).to eq("United Kingdom")
+        end
+
+        it "assigns 'start-date' to Location#start_date" do
+          expect(location.start_date).to eq(Date.civil(1707, 5, 1))
+        end
+
+        it "assigns 'end-date' to Location#end_date" do
+          expect(location.end_date).to eq(Date.civil(2017, 12, 31))
+        end
+      end
+    end
+
+    context "when a country does exist" do
+      before do
+        FactoryGirl.create(:location, code: "GB")
+
+        stub_register.to_return json_response <<-JSON
+        {
+            "GB" : {
+              "index-entry-number": "6",
+              "entry-number": "6",
+              "entry-timestamp": "2016-04-05T13:23:05Z",
+              "key": "GB",
+              "item": [{
+                "citizen-names": "Briton;British citizen",
+                "country": "GB",
+                "name": "United Kingdom",
+                "official-name": "The United Kingdom of Great Britain and Northern Ireland",
+                "start-date": "1707-05-01",
+                "end-date": "2017-12-31"
+              }]
+            }
+        }
+        JSON
+      end
+
+      it "updates an existing record" do
+        expect {
+          perform_enqueued_jobs {
+            described_class.perform_later
+          }
+        }.not_to change { Location.count }
+      end
+
+      describe "attribute assignment" do
+        let(:location) { Location.find_by!(code: "GB") }
+
+        before do
+          perform_enqueued_jobs {
+            described_class.perform_later
+          }
+        end
+
+        it "updates Location#name" do
+          expect(location.name).to eq("United Kingdom")
+        end
+
+        it "updates Location#start_date" do
+          expect(location.start_date).to eq(Date.civil(1707, 5, 1))
+        end
+
+        it "updates Location#end_date" do
+          expect(location.end_date).to eq(Date.civil(2017, 12, 31))
+        end
+      end
+    end
+
+    context "when a country does not change" do
+      let(:location) { Location.find_by!(code: "GB") }
+
+      before do
+        FactoryGirl.create(:location, code: "GB", name: "United Kingdom")
+
+        stub_register.to_return json_response <<-JSON
+        {
+            "GB" : {
+              "index-entry-number": "6",
+              "entry-number": "6",
+              "entry-timestamp": "2016-04-05T13:23:05Z",
+              "key": "GB",
+              "item": [{
+                "citizen-names": "Briton;British citizen",
+                "country": "GB",
+                "name": "United Kingdom",
+                "official-name": "The United Kingdom of Great Britain and Northern Ireland"
+              }]
+            }
+        }
+        JSON
+      end
+
+      it "doesn't update an existing record" do
+        expect {
+          perform_enqueued_jobs {
+            described_class.perform_later
+          }
+        }.not_to change { location.reload.updated_at }
+      end
+    end
+
+  end
+
+  context "old record schema" do
     context "when a country does not exist" do
       before do
         stub_register.to_return json_response <<-JSON