a further test

spec/models/sales_log_spec.rb

@@ -26,9 +26,7 @@ RSpec.describe SalesLog, type: :model do
 
   describe "#new" do
     context "when creating a record" do
-      let(:sales_log) do
-        described_class.create
-      end
+      let(:sales_log) { described_class.create }
 
       it "attaches the correct custom validator" do
         expect(sales_log._validators.values.flatten.map(&:class))
@@ -54,6 +52,14 @@ RSpec.describe SalesLog, type: :model do
     end
   end
 
+  describe "resetting invalid answers" do
+    let(:sales_log) { create(:sales_log, ownershipsch: 2, type: 8) }
+
+    it "resets attributes that have become invalid when the sales log is updated" do
+      expect { sales_log.update!(ownershipsch: 1) }.to change(sales_log, :type).from(8).to(nil)
+    end
+  end
+
   describe "#optional_fields" do
     context "when saledate is before 2023" do
       let(:sales_log) { build(:sales_log, saledate: Time.zone.parse("2022-07-01")) }