Add CI tests for Python 3.14 pre-release

- work around new class checks in pathlib

.github/workflows/testsuite.yml

@@ -32,7 +32,7 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu-latest, macOS-latest, windows-latest]
-        python-version: [3.8, 3.9, "3.10", "3.11", "3.12", "3.13"]
+        python-version: [3.8, 3.9, "3.10", "3.11", "3.12", "3.13", "3.14"]
         include:
           - python-version: "pypy-3.7"
             os: ubuntu-22.04
@@ -86,14 +86,14 @@ jobs:
         fi
       shell: bash
     - name: Install extra dependencies
-      if: ${{ matrix.python-version != 'pypy-3.10' }}
+      if: ${{ matrix.python-version != '3.14' }}
       run: |
         pip install -r extra_requirements.txt
         pip install -r legacy_requirements.txt
         pip install zstandard cffi  # needed to test #910
       shell: bash
     - name: Run unit tests with extra packages as non-root user
-      if: ${{ matrix.python-version != 'pypy-3.10' }}
+      if: ${{ matrix.python-version != '3.14' }}
       run: |
         export PYTHON_ZSTANDARD_IMPORT_POLICY=cffi  # needed to test #910
         python -m pyfakefs.tests.all_tests

CHANGES.md

@@ -12,6 +12,11 @@ The released versions correspond to PyPI releases.
 * the default for `FakeFilesystem.shuffle_listdir_results` will change to `True` to reflect
   the real filesystem behavior
 
+## Unreleased
+
+### Changes
+* added some preliminary support for Python 3.14
+
 ## [Version 5.7.4](https://pypi.python.org/pypi/pyfakefs/5.7.4) (2025-01-14)
 Minor bugfix release.
 

pyfakefs/fake_filesystem_unittest.py

@@ -993,6 +993,11 @@ def setUp(self, doctester: Any = None) -> None:
         # do not use the fd functions, as they may not be available in the target OS
         if hasattr(shutil, "_use_fd_functions"):
             shutil._use_fd_functions = False  # type: ignore[module-attr]
+        # in Python 3.14, _rmtree_impl is set at load time based on _use_fd_functions
+        # the safe version cannot be used at the moment as it used asserts of type
+        # 'assert func is os.rmtree', which do not work with the fake versions
+        if hasattr(shutil, "_rmtree_impl"):
+            shutil._rmtree_impl = shutil._rmtree_unsafe  # type: ignore[attr-defined]
 
         with warnings.catch_warnings():
             # ignore warnings, see #542 and #614

pyfakefs/fake_pathlib.py

@@ -964,6 +964,19 @@ def group(self):
 
             return grp.getgrgid(self.stat().st_gid).gr_name
 
+        if sys.version_info >= (3, 14):
+            # in Python 3.14, case-sensitivity is checked using an is-check
+            # (self.parser is posixpath) if not given, which we cannot fake
+            # therefore we already provide the case sensitivity under Posix
+            def glob(self, pattern, *, case_sensitive=None, recurse_symlinks=False):
+                if case_sensitive is None:
+                    case_sensitive = True
+                return super().glob(  # pytype: disable=wrong-keyword-args
+                    pattern,
+                    case_sensitive=case_sensitive,
+                    recurse_symlinks=recurse_symlinks,
+                )
+
     Path = FakePath
 
     def __getattr__(self, name):

pyfakefs/tests/fake_pathlib_test.py

@@ -996,8 +996,8 @@ def test_glob(self):
             sorted(path.glob("*.py")),
         )
 
-    @unittest.skipIf(not is_windows, "Windows specific test")
     def test_glob_case_windows(self):
+        self.check_windows_only()
         self.create_file(self.make_path("foo", "setup.py"))
         self.create_file(self.make_path("foo", "all_tests.PY"))
         self.create_file(self.make_path("foo", "README.md"))
@@ -1012,9 +1012,10 @@ def test_glob_case_windows(self):
             sorted(path.glob("*.py")),
         )
 
-    @unittest.skipIf(is_windows, "Posix specific test")
     def test_glob_case_posix(self):
         self.check_posix_only()
+        if sys.platform == "win32" and sys.version_info < (3, 12):
+            self.skipTest(reason="Ignoring inconsistent path delimiters")
         self.create_file(self.make_path("foo", "setup.py"))
         self.create_file(self.make_path("foo", "all_tests.PY"))
         self.create_file(self.make_path("foo", "README.md"))