Revert "Remove tests"

This reverts commit 8c9bd26f4d.

spec/models/form/sales/questions/uprn_confirmation_spec.rb

@@ -23,6 +23,10 @@ RSpec.describe Form::Sales::Questions::UprnConfirmation, type: :model do
     expect(question.derived?(nil)).to be false
   end
 
+  it "has the correct unanswered_error_message" do
+    expect(question.unanswered_error_message).to eq("You must answer is this the right address?")
+  end
+
   describe "notification_banner" do
     context "when address is not present" do
       it "returns nil" do

spec/models/form/sales/questions/uprn_known_spec.rb

@@ -34,6 +34,10 @@ RSpec.describe Form::Sales::Questions::UprnKnown, type: :model do
     expect(question.conditional_for).to eq({ "uprn" => [1] })
   end
 
+  it "has the correct unanswered_error_message" do
+    expect(question.unanswered_error_message).to eq("You must answer UPRN known?")
+  end
+
   it "has the correct hidden_in_check_answers" do
     expect(question.hidden_in_check_answers).to eq({
       "depends_on" => [