Add fields check to 2023 sales

app/services/bulk_upload/sales/year2023/csv_parser.rb

@@ -4,6 +4,7 @@ class BulkUpload::Sales::Year2023::CsvParser
   include CollectionTimeHelper
 
   MAX_COLUMNS = 142
+  FIELDS = 135
   FORM_YEAR = 2023
 
   attr_reader :path
@@ -60,7 +61,9 @@ class BulkUpload::Sales::Year2023::CsvParser
   end
 
   def correct_field_count?
-    true
+    valid_field_numbers_count = field_numbers.count { |f| f != "field_blank" }
+
+    valid_field_numbers_count == FIELDS
   end
 
 private

spec/services/bulk_upload/sales/year2023/csv_parser_spec.rb

@@ -28,6 +28,10 @@ RSpec.describe BulkUpload::Sales::Year2023::CsvParser do
     it "parses csv correctly" do
       expect(service.row_parsers[0].field_19).to eql(log.uprn)
     end
+
+    it "counts the number of valid field numbers correctly" do
+      expect(service).to be_correct_field_count
+    end
   end
 
   context "when parsing csv with headers in arbitrary order" do