#15304: merge with 3.2.

Lib/test/support.py

@@ -680,7 +680,7 @@ def temp_cwd(name='tempcwd', quiet=False, path=None):
     except OSError:
         if not quiet:
             raise
-        warnings.warn('tests may fail, unable to change the CWD to ' + name,
+        warnings.warn('tests may fail, unable to change the CWD to ' + path,
                       RuntimeWarning, stacklevel=3)
     try:
         yield os.getcwd()

Lib/test/test_support.py

@@ -95,6 +95,15 @@ class TestSupport(unittest.TestCase):
         self.assertFalse(os.path.exists(TESTFN))
         self.assertTrue(os.path.basename(os.getcwd()), here)
 
+    def test_temp_cwd__chdir_warning(self):
+        """Check the warning message when os.chdir() fails."""
+        path = TESTFN + '_does_not_exist'
+        with support.check_warnings() as recorder:
+            with support.temp_cwd(path=path, quiet=True):
+                pass
+            messages = [str(w.message) for w in recorder.warnings]
+        self.assertEqual(messages, ['tests may fail, unable to change the CWD to ' + path])
+
     def test_sortdict(self):
         self.assertEqual(support.sortdict({3:3, 2:2, 1:1}), "{1: 1, 2: 2, 3: 3}")
 

Misc/NEWS

@@ -84,6 +84,10 @@ Extension Modules
 Tests
 -----
 
+- Issue #15304: Fix warning message when os.chdir() fails inside
+  test.support.temp_cwd().  Patch by Chris Jerdonek.
+
+
 - Issue #15802: Fix test logic in TestMaildir.test_create_tmp. Patch
   by Serhiy Storchaka.