fix: add spec

server/spec/lib/reverse_etl/extractors/incremental_delta_spec.rb

@@ -134,9 +134,20 @@
     let(:model) { create(:model) }
 
     context "when the primary key is blank" do
-      it "does not create or update sync record" do
-        message = double("Message", record: double("Record", data: { "id" => nil }))
-        expect { subject.send(:process_record, message, sync_run, model) }.not_to(change { SyncRecord.count })
+      it "does not call update_or_create_sync_record" do
+        message = double("Message", record: double("Record", data: { "TestPrimaryKey" => nil }))
+        expect(subject).not_to receive(:find_or_initialize_sync_record)
+        expect(subject).not_to receive(:update_or_create_sync_record)
+        subject.send(:process_record, message, sync_run, model)
+      end
+    end
+
+    context "when the primary key is not blank" do
+      it "calls find_or_initialize_sync_record and update_or_create_sync_record" do
+        message = double("Message", record: double("Record", data: { "TestPrimaryKey" => 1 }))
+        expect(subject).to receive(:find_or_initialize_sync_record)
+        expect(subject).to receive(:update_or_create_sync_record)
+        subject.send(:process_record, message, sync_run, model)
       end
     end
   end