Add test for extracting symlink nodes and fix behavior

src/node.rs

@@ -286,7 +286,10 @@ impl Node {
                 fs::hard_link(target, &path)?;
             }
             FileType::SoftLink(ref t) => {
-                symlink(&self.name, t)?;
+                if n_path.exists() {
+                    fs::remove_file(&n_path)?;
+                }
+                symlink(t, &n_path)?;
             }
             FileType::Directory => {
                 self.mkdir(&PathBuf::from(&path))?;
@@ -528,4 +531,15 @@ mod tests {
         let f = fs::read_to_string("test/output/test/li.txt").unwrap();
         assert_eq!(f.as_bytes(), LI);
     }
+
+    #[test]
+    fn extract_symlink() {
+        let links = Mutex::new(HashMap::new());
+        let _res = remove_file("test/lilnk.txt");
+        symlink("li.txt", "test/lilnk.txt").unwrap();
+        let node = Node::from_path("test/lilnk.txt", Algorithm::Md5, &links).unwrap();
+        node.extract(Some("test/output")).unwrap();
+        let tgt = fs::read_link("test/output/test/lilnk.txt").unwrap();
+        assert_eq!(tgt, PathBuf::from("li.txt"));
+    }
 }