From a48feba2ed2ea785b626a2718e9d175cfd9045be Mon Sep 17 00:00:00 2001
From: Schamper <1254028+Schamper@users.noreply.github.com>
Date: Fri, 1 Nov 2024 15:07:34 +0100
Subject: [PATCH] Subclass exceptions from standard library exceptions

---
 dissect/ntfs/exceptions.py |  8 ++++++--
 tests/test_exceptions.py   | 19 +++++++++++++++++++
 2 files changed, 25 insertions(+), 2 deletions(-)
 create mode 100644 tests/test_exceptions.py

diff --git a/dissect/ntfs/exceptions.py b/dissect/ntfs/exceptions.py
index d5b2371..ae560af 100644
--- a/dissect/ntfs/exceptions.py
+++ b/dissect/ntfs/exceptions.py
@@ -14,7 +14,7 @@ class FilenameNotAvailableError(Error):
     pass
 
 
-class FileNotFoundError(Error):
+class FileNotFoundError(Error, FileNotFoundError):
     pass
 
 
@@ -22,7 +22,11 @@ class MftNotAvailableError(Error):
     pass
 
 
-class NotADirectoryError(Error):
+class IsADirectoryError(Error, IsADirectoryError):
+    pass
+
+
+class NotADirectoryError(Error, NotADirectoryError):
     pass
 
 
diff --git a/tests/test_exceptions.py b/tests/test_exceptions.py
new file mode 100644
index 0000000..6f1d857
--- /dev/null
+++ b/tests/test_exceptions.py
@@ -0,0 +1,19 @@
+import pytest
+
+from dissect.ntfs import exceptions
+
+
+@pytest.mark.parametrize(
+    "exc, std",
+    [
+        (exceptions.FileNotFoundError, FileNotFoundError),
+        (exceptions.IsADirectoryError, IsADirectoryError),
+        (exceptions.NotADirectoryError, NotADirectoryError),
+    ],
+)
+def test_filesystem_error_subclass(exc: exceptions.Error, std: Exception) -> None:
+    assert issubclass(exc, std)
+    assert isinstance(exc(), std)
+
+    with pytest.raises(std):
+        raise exc()