refactor: rename aim to upm and extract appimage module

crates/upm-core/tests/identity_resolution.rs

@@ -0,0 +1,47 @@
+use upm_core::app::identity::{IdentityFallback, resolve_identity};
+use upm_core::domain::app::IdentityConfidence;
+
+#[test]
+fn unresolved_identity_can_fall_back_to_url() {
+    let identity = resolve_identity(
+        None,
+        None,
+        Some("https://example.com/app.AppImage"),
+        IdentityFallback::AllowRawUrl,
+    )
+    .unwrap();
+
+    assert!(identity.stable_id.contains("example.com"));
+    assert_eq!(identity.confidence, IdentityConfidence::RawUrlFallback);
+}
+
+#[test]
+fn explicit_id_is_treated_as_confident() {
+    let identity = resolve_identity(
+        Some("Bat"),
+        Some("sharkdp/bat"),
+        Some("https://github.com/sharkdp/bat/releases"),
+        IdentityFallback::AllowRawUrl,
+    )
+    .unwrap();
+
+    assert_eq!(identity.stable_id, "sharkdp-bat");
+    assert_eq!(identity.display_name, "Bat");
+    assert_eq!(identity.confidence, IdentityConfidence::Confident);
+}
+
+#[test]
+fn identifiers_containing_dot_dot_are_rejected() {
+    let error = resolve_identity(
+        Some("Bat"),
+        Some(".."),
+        Some("https://example.com/app.AppImage"),
+        IdentityFallback::AllowRawUrl,
+    )
+    .unwrap_err();
+
+    assert_eq!(
+        error,
+        upm_core::app::identity::ResolveIdentityError::InvalidStableId
+    );
+}