test: put test within context block for clarity

spec/services/bulk_upload/lettings/year2023/row_parser_spec.rb

@@ -238,7 +238,8 @@ RSpec.describe BulkUpload::Lettings::Year2023::RowParser do
       end
 
       describe "#validate_nulls" do
-        let(:attributes) { { bulk_upload:, field_18: "", field_19: "", field_21: "" } }
+        context "for non-setup questions" do
+          let(:attributes) { { bulk_upload:, field_1: "", field_18: "", field_19: "", field_21: "" } }
 
           it "fetches the question's check_answer_label if it exists, otherwise it get's the question's header" do
             parser.valid?
@@ -247,6 +248,7 @@ RSpec.describe BulkUpload::Lettings::Year2023::RowParser do
           end
         end
       end
+    end
 
     context "when setup section not complete" do
       let(:attributes) { { bulk_upload:, field_13: "123" } }