+
+
+Explicit calls to _autoenv_get_file_mtime to test alternative implementation
+of _autoenv_get_file_mtime (via ZDOTDIR.invalid-module_path/).
+
+ $ _autoenv_get_file_mtime non-existing
+ 0
+ $ touch -t 201401010101 file
+ $ _autoenv_get_file_mtime file
+ 1388538060
+ $ mkdir dir
+ $ touch -t 201401010102 dir
+ $ _autoenv_get_file_mtime dir
+ 1388538120