pathio: update expected exceptions list from unlink on directory (fixes #117) (#118)

* tests: Fix expected exceptions from unlink call on directory (#118)

POSIX prescribes ([1]) unlink(2) to return EPERM when called on directories:

    [EPERM]
        The file named by path is a directory, and either the calling process does not have appropriate privileges, or the implementation prohibits using unlink() on directories.

and returning EISDIR in this case is Linux-specific behavior which does not happen on e.g. FreeBSD. So expect either of IsADirectoryError, PermissionError in the corresponding test.

[1] https://pubs.opengroup.org/onlinepubs/007904975/toc.htm

* Update history.rst

Co-authored-by: Nikita Melentev <multisosnooley@gmail.com>

Author: AMDmi3

history.rst

@@ -1,6 +1,9 @@
 x.x.x (xx-xx-xxxx)
 ------------------
 
+- tests: fix test_unlink_on_dir on POSIX compatible systems (#118)
+Thanks to `AMDmi3 <https://github.com/AMDmi3>`_
+
 0.16.1 (09-07-2020)
 ------------------
 

tests/test_pathio.py

@@ -252,7 +252,7 @@ async def test_unlink_not_exist(path_io, temp_dir):
 
 @pytest.mark.asyncio
 async def test_unlink_on_dir(path_io, temp_dir):
-    with universal_exception_reason(IsADirectoryError):
+    with universal_exception_reason(IsADirectoryError, PermissionError):
         await path_io.unlink(temp_dir)