Merge pull request #8754 from nicoddemus/fix-deprecation-docs

Author: nicoddemus

doc/en/how-to/capture-warnings.rst

@@ -173,8 +173,6 @@ DeprecationWarning and PendingDeprecationWarning
 ------------------------------------------------
 
 
-
-
 By default pytest will display ``DeprecationWarning`` and ``PendingDeprecationWarning`` warnings from
 user code and third-party libraries, as recommended by `PEP-0565 <https://www.python.org/dev/peps/pep-0565>`_.
 This helps users keep their code modern and avoid breakages when deprecated warnings are effectively removed.
@@ -230,27 +228,8 @@ that a certain function call triggers a ``DeprecationWarning`` or
 This test will fail if ``myfunction`` does not issue a deprecation warning
 when called with a ``17`` argument.
 
-By default, ``DeprecationWarning`` and ``PendingDeprecationWarning`` will not be
-caught when using :func:`pytest.warns` or :ref:`recwarn <recwarn>` because
-the default Python warnings filters hide
-them. If you wish to record them in your own code, use
-``warnings.simplefilter('always')``:
-
-.. code-block:: python
-
-    import warnings
-    import pytest
-
-
-    def test_deprecation(recwarn):
-        warnings.simplefilter("always")
-        myfunction(17)
-        assert len(recwarn) == 1
-        assert recwarn.pop(DeprecationWarning)
 
 
-The :ref:`recwarn <recwarn>` fixture automatically ensures to reset the warnings
-filter at the end of the test, so no global state is leaked.
 
 .. _`asserting warnings`:
 
@@ -317,9 +296,9 @@ additional information:
 Alternatively, you can examine raised warnings in detail using the
 :ref:`recwarn <recwarn>` fixture (see below).
 
-.. note::
-    ``DeprecationWarning`` and ``PendingDeprecationWarning`` are treated
-    differently; see :ref:`ensuring_function_triggers`.
+
+The :ref:`recwarn <recwarn>` fixture automatically ensures to reset the warnings
+filter at the end of the test, so no global state is leaked.
 
 .. _`recording warnings`:
 

src/_pytest/tmpdir.py

@@ -1,6 +1,7 @@
 """Support for providing temporary directories to test functions."""
 import os
 import re
+import sys
 import tempfile
 from pathlib import Path
 from typing import Optional
@@ -130,9 +131,9 @@ def getbasetemp(self) -> Path:
             # Also, to keep things private, fixup any world-readable temp
             # rootdir's permissions. Historically 0o755 was used, so we can't
             # just error out on this, at least for a while.
-            if hasattr(os, "getuid"):
-                rootdir_stat = rootdir.stat()
+            if sys.platform != "win32":
                 uid = os.getuid()
+                rootdir_stat = rootdir.stat()
                 # getuid shouldn't fail, but cpython defines such a case.
                 # Let's hope for the best.
                 if uid != -1:

testing/test_recwarn.py

@@ -27,6 +27,17 @@ def test_method(recwarn):
     reprec.assertoutcome(passed=1)
 
 
+@pytest.mark.filterwarnings("")
+def test_recwarn_captures_deprecation_warning(recwarn: WarningsRecorder) -> None:
+    """
+    Check that recwarn can capture DeprecationWarning by default
+    without custom filterwarnings (see #8666).
+    """
+    warnings.warn(DeprecationWarning("some deprecation"))
+    assert len(recwarn) == 1
+    assert recwarn.pop(DeprecationWarning)
+
+
 class TestWarningsRecorderChecker:
     def test_recording(self) -> None:
         rec = WarningsRecorder(_ispytest=True)