Validate grant amount for 24/25 onwards

app/models/validations/sales/sale_information_validations.rb

@@ -55,4 +55,13 @@ module Validations::Sales::SaleInformationValidations
       record.errors.add :type, I18n.t("validations.sale_information.monthly_rent.higher_than_expected")
     end
   end
+
+  def validate_grant_amount(record)
+    return unless record.grant
+    return unless record.saledate && record.form.start_year_after_2024?
+
+    unless record.grant.between?(9_000, 16_000)
+      record.errors.add :grant, I18n.t("validations.sale_information.grant.out_of_range")
+    end
+  end
 end

config/locales/en.yml

@@ -613,6 +613,8 @@ en:
       discounted_ownership_value: "The mortgage, deposit, and grant when added together is %{mortgage_deposit_and_grant_total}, and the purchase purchase price times by the discount is %{value_with_discount}. These figures should be the same"
       monthly_rent:
         higher_than_expected: "Basic monthly rent must be between £0.00 and £9,999.00"
+      grant:
+        out_of_range: "Loan, grants or subsidies must be between £9,000 and £16,000"
     merge_request:
       organisation_part_of_another_merge: "This organisation is part of another merge - select a different one"
       organisation_not_selected: "Select an organisation from the search list"

spec/models/validations/sales/sale_information_validations_spec.rb

@@ -467,4 +467,56 @@ RSpec.describe Validations::Sales::SaleInformationValidations do
       end
     end
   end
+
+  describe "#validate_grant_amount" do
+    context "when within permitted bounds" do
+      let(:record) { build(:sales_log, grant: 10_000, saledate: Time.zone.local(2024, 4, 5)) }
+
+      it "does not add an error" do
+        sale_information_validator.validate_grant_amount(record)
+
+        expect(record.errors).not_to be_present
+      end
+    end
+
+    context "when over the max" do
+      let(:record) { build(:sales_log, grant: 17_000, saledate: Time.zone.local(2024, 4, 5)) }
+
+      it "adds an error" do
+        sale_information_validator.validate_grant_amount(record)
+
+        expect(record.errors[:grant]).to include("Loan, grants or subsidies must be between £9,000 and £16,000")
+      end
+    end
+
+    context "when under the min" do
+      let(:record) { build(:sales_log, grant: 3, saledate: Time.zone.local(2024, 4, 5)) }
+
+      it "adds an error" do
+        sale_information_validator.validate_grant_amount(record)
+
+        expect(record.errors[:grant]).to include("Loan, grants or subsidies must be between £9,000 and £16,000")
+      end
+    end
+
+    context "when grant is blank" do
+      let(:record) { build(:sales_log, grant: nil, saledate: Time.zone.local(2024, 4, 5)) }
+
+      it "does not add an error" do
+        sale_information_validator.validate_grant_amount(record)
+
+        expect(record.errors).not_to be_present
+      end
+    end
+
+    context "with log before 2024/25 collection" do
+      let(:record) { build(:sales_log, grant: 3, saledate: Time.zone.local(2023, 4, 5)) }
+
+      it "does not add an error" do
+        sale_information_validator.validate_grant_amount(record)
+
+        expect(record.errors).not_to be_present
+      end
+    end
+  end
 end