test: shared factories and command builders

crates/application/src/auth/tests/register.rs

@@ -1,6 +1,6 @@
+use crate::test_support::register_command;
 use std::sync::Arc;
 
-use domain::models::UserRole;
 use domain::ports::UserRepository;
 use domain::testing::InMemoryUserRepository;
 use domain::value_objects::Email;
@@ -11,12 +11,7 @@ use crate::{
 };
 
 fn cmd(email: &str) -> RegisterCommand {
-    RegisterCommand {
-        email: email.to_string(),
-        username: "alice".to_string(),
-        password: "password123".to_string(),
-        role: UserRole::Standard,
-    }
+    register_command(email, "alice")
 }
 
 #[tokio::test]
@@ -67,10 +62,8 @@ async fn test_register_short_password_fails() {
     let result = register::execute(
         &deps,
         RegisterCommand {
-            email: "x@y.com".to_string(),
-            username: "testuser".to_string(),
             password: "short".to_string(),
-            role: UserRole::Standard,
+            ..register_command("x@y.com", "testuser")
         },
     )
     .await;