Add test for inferring startdate, fix other tests

app/models/case_log.rb

@@ -183,6 +183,9 @@ private
       self.mrcmonth = mrcdate.month
       self.mrcyear = mrcdate.year
     end
+    if day.present? && month.present? && year.present?
+      self.startdate = Time.zone.local(year, month, day)
+    end
     self.incref = 1 if net_income_known == "Prefer not to say"
     self.hhmemb = other_hhmemb + 1 if other_hhmemb.present?
     self.renttype = RENT_TYPE_MAPPING[rent_type]

spec/factories/case_log.rb

@@ -134,6 +134,9 @@ FactoryBot.define do
       incref { 0 }
       sale_completion_date { nil }
       startdate { Time.zone.now }
+      day { Time.zone.now.day }
+      month { Time.zone.now.month }
+      year { Time.zone.now.year }
       armedforces { 1 }
       builtype { 1 }
       unitletas { 2 }

spec/fixtures/complete_case_log.json

@@ -51,6 +51,9 @@
     "condition_effects": "dummy",
     "tenancy_code": "BZ757",
     "startdate": "12/12/2020",
+    "day": 12,
+    "month": 12,
+    "year": 2020,
     "startertenancy": "No",
     "tenancylength": "5",
     "tenancy": "Secure (including flexible)",

spec/models/case_log_spec.rb

@@ -881,6 +881,9 @@ RSpec.describe Form, type: :model do
         owning_organisation: organisation,
         property_postcode: "M1 1AE",
         previous_postcode: "M2 2AE",
+        day: 10,
+        month: 10,
+        year: 2021,
         # rubocop:disable Style/DateTime
         mrcdate: DateTime.new(2021, 5, 4),
         # rubocop:enable Style/DateTime
@@ -948,5 +951,13 @@ RSpec.describe Form, type: :model do
       expect(case_log.lettype).to eq("Intermediate Rent General needs PRP")
       expect(record_from_db["lettype"]).to eq(9)
     end
+
+    it "correctly derives and saves startdate" do
+      case_log.reload
+
+      record_from_db = ActiveRecord::Base.connection.execute("select startdate from case_logs where id=#{case_log.id}").to_a[0]
+      expect(case_log.startdate).to eq(Time.zone.local(2021, 10, 10))
+      expect(record_from_db["startdate"]).to eq(Time.zone.local(2021, 10, 10))
+    end
   end
 end