Add shared_ownership_deposit_invalid? soft validation

app/models/validations/sales/soft_validations.rb

@@ -37,6 +37,12 @@ module Validations::Sales::SoftValidations
     deposit > savings * 4 / 3
   end
 
+  def shared_ownership_deposit_invalid?
+    return unless mortgage && deposit && cashdis && value && equity
+
+    mortgage + deposit + cashdis != value * equity / 100
+  end
+
   def hodate_3_years_or_more_saledate?
     return unless hodate && saledate
 

spec/models/validations/sales/soft_validations_spec.rb

@@ -254,6 +254,85 @@ RSpec.describe Validations::Sales::SoftValidations do
           .not_to be_deposit_over_soft_max
       end
     end
+
+    context "when validating shared ownership deposit" do
+      it "returns false if MORTGAGE + DEPOSIT + CASHDIS are equal VALUE * EQUITY/100" do
+        record.mortgage = 1000
+        record.deposit = 1000
+        record.cashdis = 1000
+        record.value = 3000
+        record.equity = 100
+
+        expect(record)
+          .not_to be_shared_ownership_deposit_invalid
+      end
+
+      it "returns false if no mortgage is given" do
+        record.mortgage = nil
+        record.deposit = 1000
+        record.cashdis = 1000
+        record.value = 3000
+        record.equity = 100
+
+        expect(record)
+          .not_to be_shared_ownership_deposit_invalid
+      end
+
+      it "returns false if no deposit is given" do
+        record.mortgage = 1000
+        record.deposit = nil
+        record.cashdis = 1000
+        record.value = 3000
+        record.equity = 100
+
+        expect(record)
+          .not_to be_shared_ownership_deposit_invalid
+      end
+
+      it "returns false if no cashdis is given" do
+        record.mortgage = 1000
+        record.deposit = 1000
+        record.cashdis = nil
+        record.value = 3000
+        record.equity = 100
+
+        expect(record)
+          .not_to be_shared_ownership_deposit_invalid
+      end
+
+      it "returns false if no value is given" do
+        record.mortgage = 1000
+        record.deposit = 1000
+        record.cashdis = 1000
+        record.value = nil
+        record.equity = 100
+
+        expect(record)
+          .not_to be_shared_ownership_deposit_invalid
+      end
+
+      it "returns false if no equity is given" do
+        record.mortgage = 1000
+        record.deposit = 1000
+        record.cashdis = 1000
+        record.value = 3000
+        record.equity = nil
+
+        expect(record)
+          .not_to be_shared_ownership_deposit_invalid
+      end
+
+      it "returns true if MORTGAGE + DEPOSIT + CASHDIS are not equal VALUE * EQUITY/100" do
+        record.mortgage = 1000
+        record.deposit = 1000
+        record.cashdis = 1000
+        record.value = 4323
+        record.equity = 100
+
+        expect(record)
+          .to be_shared_ownership_deposit_invalid
+      end
+    end
   end
 
   describe "hodate_more_than_3_years_before_saledate" do