Test that renaming symlinks preserves the symlink

library/std/src/fs/tests.rs

@@ -1959,9 +1959,12 @@ fn test_rename_symlink() {
     let tmpdir = tmpdir();
     let original = tmpdir.join("original");
     let dest = tmpdir.join("dest");
+    let not_exist = Path::new("does not exist");
 
-    symlink_file("does not exist", &original).unwrap();
+    symlink_file(not_exist, &original).unwrap();
     fs::rename(&original, &dest).unwrap();
+    // Make sure that copying `original` to `dest` preserves the symlink.
+    assert_eq!(fs::read_link(&dest).unwrap().as_path(), not_exist);
 }
 
 #[test]
@@ -1970,7 +1973,12 @@ fn test_rename_junction() {
     let tmpdir = tmpdir();
     let original = tmpdir.join("original");
     let dest = tmpdir.join("dest");
+    let not_exist = Path::new("does not exist");
 
-    junction_point("does not exist", &original).unwrap();
+    junction_point(&not_exist, &original).unwrap();
     fs::rename(&original, &dest).unwrap();
+
+    // Make sure that copying `original`` to `dest` preserves the junction point.
+    // Junction links are always absolute so we just check the file name is correct.
+    assert_eq!(fs::read_link(&dest).unwrap().file_name(), Some(not_exist.as_os_str()));
 }