domain: add Media Catalog entities (Asset, Metadata, Stack, Derivative, Duplicate)

crates/domain/tests/entities/asset_stack.rs

@@ -0,0 +1,31 @@
+use domain::entities::{AssetStack, StackMemberRole, StackType};
+use domain::errors::DomainError;
+use domain::value_objects::SystemId;
+
+#[test]
+fn new_stack_contains_primary() {
+    let primary = SystemId::new();
+    let stack = AssetStack::new(StackType::LivePhoto, primary.clone(), SystemId::new());
+    assert_eq!(stack.members.len(), 1);
+    assert_eq!(stack.members[0].asset_id, primary);
+    assert_eq!(stack.members[0].role, StackMemberRole::PrimaryDisplay);
+    assert_eq!(stack.members[0].sort_order, 0);
+}
+
+#[test]
+fn add_motion_clip() {
+    let mut stack = AssetStack::new(StackType::LivePhoto, SystemId::new(), SystemId::new());
+    let clip_id = SystemId::new();
+    stack.add_member(clip_id.clone(), StackMemberRole::MotionClip).unwrap();
+    assert_eq!(stack.members.len(), 2);
+    assert_eq!(stack.members[1].asset_id, clip_id);
+    assert_eq!(stack.members[1].sort_order, 1);
+}
+
+#[test]
+fn cannot_add_duplicate() {
+    let primary = SystemId::new();
+    let mut stack = AssetStack::new(StackType::LivePhoto, primary.clone(), SystemId::new());
+    let result = stack.add_member(primary, StackMemberRole::HighResSource);
+    assert!(matches!(result, Err(DomainError::Conflict(_))));
+}