feat: add webform validation

app/models/validations/household_validations.rb

@@ -112,6 +112,15 @@ module Validations::HouseholdValidations
     end
   end
 
+  def validate_layear(record)
+    return unless record.layear && record.renewal
+
+    if record.is_renewal? && record.layear == 1
+      record.errors.add :layear, I18n.t("validations.household.renewal_just_moved_to_area.layear")
+      record.errors.add :renewal, I18n.t("validations.household.renewal_just_moved_to_area.renewal")
+    end
+  end
+
 private
 
   def household_no_illness?(record)

config/locales/en.yml

@@ -414,6 +414,9 @@ en:
         reasonpref:
           not_homeless: "Answer cannot be ‘no’ as the tenant was homeless or about to lose their home"
       previous_la_known: "Enter name of local authority"
+      renewal_just_moved_to_area:
+        layear: 'For a renewal, you cannot select "just moved to local authority area"'
+        renewal: 'This cannot be a renewal as you told us the household "just moved to local authority area"'
       gender:
         retired_male: "Answer cannot be ‘male’ as tenant is under 65 and retired"
         retired_female: "Answer cannot be ‘female’ as tenant is under 60 and retired"