Add tests

src/virtual_dirs.rs

@@ -119,3 +119,148 @@ pub fn restore_virtual_paths(
         }
     }
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use std::collections::HashMap;
+
+    #[test]
+    fn virtual_inode_deterministic() {
+        let ino1 = virtual_inode("foo");
+        let ino2 = virtual_inode("foo");
+        assert_eq!(ino1, ino2);
+    }
+
+    #[test]
+    fn virtual_inode_high_bit_set() {
+        let ino = virtual_inode("test");
+        assert_eq!(ino.0 & (1u64 << 63), 1u64 << 63);
+    }
+
+    #[test]
+    fn virtual_inode_different_inputs() {
+        let ino1 = virtual_inode("foo");
+        let ino2 = virtual_inode("bar");
+        assert_ne!(ino1, ino2);
+    }
+
+    #[test]
+    fn parent_inode_single_component() {
+        let ino = parent_inode_from_path(Path::new("file.txt"));
+        assert_eq!(ino, INodeNo::ROOT);
+    }
+
+    #[test]
+    fn parent_inode_multi_component() {
+        let ino = parent_inode_from_path(Path::new("a/b/c"));
+        let expected = virtual_inode("a/b");
+        assert_eq!(ino, expected);
+    }
+
+    #[test]
+    fn parent_inode_absolute_path_filtered() {
+        let ino = parent_inode_from_path(Path::new("/file"));
+        assert_eq!(ino, INodeNo::ROOT);
+    }
+
+    #[test]
+    fn ensure_virtual_dirs_single_component() {
+        let tmp = tempfile::tempdir().unwrap();
+        let source = tmp.path();
+        let mut map = BTreeMap::new();
+
+        let ino = ensure_virtual_dirs(Path::new("file.txt"), source, &mut map);
+        assert_eq!(ino, INodeNo::ROOT);
+        assert!(map.is_empty());
+    }
+
+    #[test]
+    fn ensure_virtual_dirs_creates_hierarchy() {
+        let tmp = tempfile::tempdir().unwrap();
+        let source = tmp.path();
+        let mut map = BTreeMap::new();
+
+        let ino = ensure_virtual_dirs(Path::new("a/b/file"), source, &mut map);
+
+        let a_ino = virtual_inode("a");
+        let ab_ino = virtual_inode("a/b");
+
+        assert_eq!(ino, ab_ino);
+        assert_eq!(map.len(), 2);
+        assert!(map.contains_key(&a_ino));
+        assert!(map.contains_key(&ab_ino));
+
+        let a_item = &map[&a_ino];
+        assert_eq!(a_item.parent_inode, INodeNo::ROOT);
+
+        let ab_item = &map[&ab_ino];
+        assert_eq!(ab_item.parent_inode, a_ino);
+    }
+
+    #[test]
+    fn ensure_virtual_dirs_idempotent() {
+        let tmp = tempfile::tempdir().unwrap();
+        let source = tmp.path();
+        let mut map = BTreeMap::new();
+
+        ensure_virtual_dirs(Path::new("a/b/file"), source, &mut map);
+        let size_after_first = map.len();
+
+        ensure_virtual_dirs(Path::new("a/b/file"), source, &mut map);
+        let size_after_second = map.len();
+
+        assert_eq!(size_after_first, size_after_second);
+    }
+
+    #[test]
+    fn restore_virtual_paths_skips_root() {
+        let tmp = tempfile::tempdir().unwrap();
+        let source = tmp.path();
+        let mut snapshot = BTreeMap::new();
+
+        let real_ino = INodeNo(42);
+        let real_item = Item::new(
+            real_ino,
+            INodeNo::ROOT,
+            "real_file".to_string(),
+            source.to_path_buf(),
+            PathBuf::from("real_file"),
+            FileType::File,
+            fs::metadata(source).unwrap(),
+            None,
+        );
+        snapshot.insert(real_ino, real_item);
+
+        let mut db_items = HashMap::new();
+        db_items.insert(
+            1i64,
+            Model {
+                inode: 1,
+                hash: 0,
+                name: "root".to_string(),
+                original_path: "/tmp/test".to_string(),
+                local_path: "/tmp/test".to_string(),
+                file_type: "directory".to_string(),
+            },
+        );
+        db_items.insert(
+            42i64,
+            Model {
+                inode: 42,
+                hash: 0,
+                name: "real_file".to_string(),
+                original_path: "real_file".to_string(),
+                local_path: "real_file".to_string(),
+                file_type: "file".to_string(),
+            },
+        );
+
+        restore_virtual_paths(&mut snapshot, &db_items, source);
+
+        for item in snapshot.values() {
+            assert_ne!(item.name, "/");
+            assert_ne!(item.name, "tmp");
+        }
+    }
+}