Add regression test for #453 and update CHANGELOG.md

Author: althonos

CHANGELOG.md

@@ -13,6 +13,8 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 - Added FTP over TLS (FTPS) support to FTPFS.
   Closes [#437](https://github.com/PyFilesystem/pyfilesystem2/issues/437),
   [#449](https://github.com/PyFilesystem/pyfilesystem2/pull/449).
+- `PathError` now supports wrapping an exception using the `exc` argument.
+  Closes [#453](https://github.com/PyFilesystem/pyfilesystem2/issues/453).
 
 ### Changed
 

tests/test_error_tools.py

@@ -3,13 +3,23 @@
 import errno
 import unittest
 
+import fs.errors
 from fs.error_tools import convert_os_errors
-from fs import errors as fserrors
 
 
 class TestErrorTools(unittest.TestCase):
-    def assert_convert_os_errors(self):
+    def test_convert_enoent(self):
+        exception = OSError(errno.ENOENT, "resource not found")
+        with self.assertRaises(fs.errors.ResourceNotFound) as ctx:
+            with convert_os_errors("stat", "/tmp/test"):
+                raise exception
+        self.assertEqual(ctx.exception.exc, exception)
+        self.assertEqual(ctx.exception.path, "/tmp/test")
 
-        with self.assertRaises(fserrors.ResourceNotFound):
-            with convert_os_errors("foo", "test"):
-                raise OSError(errno.ENOENT)
+    def test_convert_enametoolong(self):
+        exception = OSError(errno.ENAMETOOLONG, "File name too long: test")
+        with self.assertRaises(fs.errors.PathError) as ctx:
+            with convert_os_errors("stat", "/tmp/test"):
+                raise exception
+        self.assertEqual(ctx.exception.exc, exception)
+        self.assertEqual(ctx.exception.path, "/tmp/test")