vweb: fix routes without results in vweb_app_test.v (#20548)

vlib/vweb/vweb_app_test.v

@@ -18,13 +18,13 @@ struct Article {
 }
 
 fn test_a_vweb_application_compiles() {
-	spawn fn () {
-		time.sleep(2 * time.second)
-		exit(0)
-	}()
 	vweb.run(&App{}, 18081)
 }
 
+pub fn (mut app App) before_accept_loop() {
+	exit(0)
+}
+
 pub fn (mut app App) before_request() {
 	app.user_id = app.get_cookie('id') or { '0' }
 }
@@ -49,18 +49,18 @@ pub fn (mut app App) new_article() vweb.Result {
 	return app.redirect('/')
 }
 
-fn (mut app App) time() {
-	app.text(time.now().format())
+fn (mut app App) time() vweb.Result {
+	return app.text(time.now().format())
 }
 
-fn (mut app App) time_json() {
-	app.json({
+fn (mut app App) time_json() vweb.Result {
+	return app.json({
 		'time': time.now().format()
 	})
 }
 
-fn (mut app App) time_json_pretty() {
-	app.json_pretty({
+fn (mut app App) time_json_pretty() vweb.Result {
+	return app.json_pretty({
 		'time': time.now().format()
 	})
 }