improve test coverage

Author: picnixz

Lib/test/test_exceptions.py

@@ -1338,20 +1338,24 @@ def test_unicode_errors_no_object(self):
             self.assertEqual(str(klass.__new__(klass)), "")
 
     def test_unicode_error_str_gh_123378(self):
-        for fn, start, end, obj in product(
+        for formatter, start, end, obj in product(
             (str, repr),
             range(-5, 5),
             range(-5, 5),
             ('', 'a', '123', '1234', '12345', 'abc123'),
         ):
-            with self.subTest(fn, obj=obj, start=start, end=end):
+            with self.subTest(formatter, obj=obj, start=start, end=end):
                 exc = UnicodeEncodeError('utf-8', obj, start, end, '')
-                self.assertIsInstance(fn(exc), str)
+                self.assertIsInstance(formatter(exc), str)
+
+            with self.subTest(formatter, obj=obj, start=start, end=end):
+                exc = UnicodeTranslateError(obj, start, end, '')
+                self.assertIsInstance(formatter(exc), str)
 
             encoded = obj.encode()
-            with self.subTest(fn, obj=encoded, start=start, end=end):
+            with self.subTest(formatter, obj=encoded, start=start, end=end):
                 exc = UnicodeDecodeError('utf-8', encoded, start, end, '')
-                self.assertIsInstance(fn(exc), str)
+                self.assertIsInstance(formatter(exc), str)
 
     @no_tracing
     def test_badisinstance(self):