bpo-41137: Use utf-8 encoding while reading .pdbrc files (GH-21263)

1 files changed, 34 insertions, 0 deletions

diff --git a/Lib/test/test_pdb.py b/Lib/test/test_pdb.py
index 63afb81..17634c7 100644
--- a/Lib/test/test_pdb.py
+++ b/Lib/test/test_pdb.py
@@ -1627,6 +1627,40 @@ def bœr():
                 if save_home is not None:
                     os.environ["HOME"] = save_home
 
+    def test_read_pdbrc_with_ascii_encoding(self):
+        script = textwrap.dedent("""
+            import pdb; pdb.Pdb().set_trace()
+            print('hello')
+        """)
+        save_home = os.environ.pop('HOME', None)
+        try:
+            with os_helper.temp_cwd():
+                with open('.pdbrc', 'w', encoding='utf-8') as f:
+                    f.write("Fran\u00E7ais")
+
+                with open('main.py', 'w', encoding='utf-8') as f:
+                    f.write(script)
+
+                cmd = [sys.executable, 'main.py']
+                env = {'PYTHONIOENCODING': 'ascii'}
+                if sys.platform == 'win32':
+                    env['PYTHONLEGACYWINDOWSSTDIO'] = 'non-empty-string'
+                proc = subprocess.Popen(
+                    cmd,
+                    stdout=subprocess.PIPE,
+                    stdin=subprocess.PIPE,
+                    stderr=subprocess.PIPE,
+                    env={**os.environ, **env}
+                )
+                with proc:
+                    stdout, stderr = proc.communicate(b'c\n')
+                    self.assertIn(b"UnicodeEncodeError: \'ascii\' codec can\'t encode character "
+                                  b"\'\\xe7\' in position 21: ordinal not in range(128)", stderr)
+
+        finally:
+            if save_home is not None:
+                os.environ['HOME'] = save_home
+
     def test_header(self):
         stdout = StringIO()
         header = 'Nobody expects... blah, blah, blah'