app: add storage commands/queries + missing in-memory test repos

crates/application/tests/storage/commands/register_volume.rs

@@ -0,0 +1,30 @@
+use std::sync::Arc;
+use application::testing::InMemoryStorageVolumeRepository;
+use application::storage::{RegisterVolumeCommand, RegisterVolumeHandler};
+use domain::errors::DomainError;
+
+#[tokio::test]
+async fn creates_volume() {
+    let repo = Arc::new(InMemoryStorageVolumeRepository::new());
+    let handler = RegisterVolumeHandler::new(repo);
+    let vol = handler.execute(RegisterVolumeCommand {
+        volume_name: "primary".into(),
+        uri_prefix: "file:///data".into(),
+        is_writable: true,
+    }).await.unwrap();
+    assert_eq!(vol.volume_name, "primary");
+    assert_eq!(vol.uri_prefix, "file:///data");
+    assert!(vol.is_writable);
+}
+
+#[tokio::test]
+async fn rejects_empty_name() {
+    let repo = Arc::new(InMemoryStorageVolumeRepository::new());
+    let handler = RegisterVolumeHandler::new(repo);
+    let result = handler.execute(RegisterVolumeCommand {
+        volume_name: "".into(),
+        uri_prefix: "file:///data".into(),
+        is_writable: true,
+    }).await;
+    assert!(matches!(result, Err(DomainError::Validation(_))));
+}