Make sure tempfile is patched after resume

- fixes #1098 (regression in version 5.7.2)

Author: mrbean-bremen

CHANGES.md

@@ -12,6 +12,12 @@ 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
+
+### Fixes
+* fixed a regression in version 5.7.2 that `tempfile` was not patched after pause/resume
+  (POSIX only, see [#1098](../../issues/1098))
+
 ## [Version 5.7.2](https://pypi.python.org/pypi/pyfakefs/5.7.2) (2024-12-01)
 Fixes some problems with patching.
 

pyfakefs/fake_filesystem_unittest.py

@@ -125,6 +125,7 @@ def stop_patching(self):
             tempfile._TemporaryFileCloser.close = self.tempfile_cleanup  # type: ignore[module-attr]
         else:
             tempfile._TemporaryFileCloser.cleanup = self.tempfile_cleanup  # type: ignore[module-attr]
+        self.tempfile_cleanup = None
         # reset the cached tempdir in tempfile
         tempfile.tempdir = None
 

pyfakefs/tests/fake_filesystem_unittest_test.py

@@ -639,6 +639,13 @@ def test_pause_resume_without_patcher(self):
         with self.assertRaises(RuntimeError):
             fs.resume()
 
+    def test_that_tempfile_is_patched_after_resume(fs):
+        """Regression test for #1098"""
+        fs.pause()
+        fs.resume()
+        with tempfile.NamedTemporaryFile():
+            pass
+
 
 class PauseResumePatcherTest(fake_filesystem_unittest.TestCase):
     def test_pause_resume(self):