Handle error parsing confirmation email address

Handle the ConfirmationEmailToAddressError raised by
FormSubmissionService in CheckYourAnswersController#submit_answers by
re-rendering the check your answers page with a validation error
message stating that the email address is invalid.

Author: stephencdaly

app/controllers/forms/check_your_answers_controller.rb

@@ -36,13 +36,19 @@ def submit_answers
         return render template: "errors/incomplete_submission", locals: { current_form:, current_context: }
       end
 
-      submission_reference = FormSubmissionService.call(current_context:,
-                                                        email_confirmation_input:,
-                                                        mode:).submit
+      begin
+        submission_reference = FormSubmissionService.call(current_context:,
+                                                          email_confirmation_input:,
+                                                          mode:).submit
 
-      current_context.save_submission_details(submission_reference, requested_email_confirmation)
+        current_context.save_submission_details(submission_reference, requested_email_confirmation)
 
-      redirect_to :form_submitted
+        redirect_to :form_submitted
+      rescue FormSubmissionService::ConfirmationEmailToAddressError
+        setup_check_your_answers
+        email_confirmation_input.errors.add(:confirmation_email_address, :invalid_email)
+        render template: "forms/check_your_answers/show", locals: { email_confirmation_input: }, status: :unprocessable_content
+      end
     rescue StandardError => e
       log_rescued_exception(e)
 

spec/requests/forms/check_your_answers_controller_spec.rb

@@ -704,6 +704,28 @@
 
       include_examples "for notification references"
     end
+
+    context "when there is an ActionMailer error with the confirmation email address" do
+      before do
+        mock_form_submission_service = instance_double(FormSubmissionService)
+        allow(FormSubmissionService).to receive(:new).and_return(mock_form_submission_service)
+        allow(mock_form_submission_service).to receive(:submit).and_raise(FormSubmissionService::ConfirmationEmailToAddressError)
+
+        post form_submit_answers_path(2, "form-name", 1, mode:), params: { email_confirmation_input: }
+      end
+
+      it "return 422 error code" do
+        expect(response).to have_http_status(:unprocessable_content)
+      end
+
+      it "renders the check your answers page" do
+        expect(response).to render_template("forms/check_your_answers/show")
+      end
+
+      it "has a validation error for the confirmation email address" do
+        expect(response.body).to include(I18n.t("activemodel.errors.models.email_confirmation_input.attributes.confirmation_email_address.invalid_email"))
+      end
+    end
   end
 
 private