No way to run `commithook test` in relative path

[andkirby]

$ cd project
$ cd some/dir
$ commithook test some/path

  [PreCommit\Exception]
  File 'D:/home/project\some/path/file.php' does not exist.

Target file:

$ pwd
D:/home/project/some/dir

$ ls D:/home/project/some/dir/some/path/file.php
D:/home/project/some/dir/some/path/file.php