gh-122888: Fix crash on certain calls to str() (#122889)

Fixes #122888

1 files changed, 32 insertions, 11 deletions

diff --git a/Lib/test/test_str.py b/Lib/test/test_str.py
index 7bdd288..b9ab137 100644
--- a/Lib/test/test_str.py
+++ b/Lib/test/test_str.py
@@ -1736,8 +1736,6 @@ class StrTest(string_tests.StringLikeTest,
             'character buffers are decoded to unicode'
         )
 
-        self.assertRaises(TypeError, str, 42, 42, 42)
-
     def test_constructor_keyword_args(self):
         """Pass various keyword argument combinations to the constructor."""
         # The object argument can be passed as a keyword.
@@ -2652,22 +2650,45 @@ class StrTest(string_tests.StringLikeTest,
         self.assertEqual(proc.rc, 10, proc)
 
     def test_str_invalid_call(self):
-        check = lambda *a, **kw: self.assertRaises(TypeError, str, *a, **kw)
-
         # too many args
-        check(1, "", "", 1)
+        with self.assertRaisesRegex(TypeError, r"str expected at most 3 arguments, got 4"):
+            str("too", "many", "argu", "ments")
+        with self.assertRaisesRegex(TypeError, r"str expected at most 3 arguments, got 4"):
+            str(1, "", "", 1)
 
         # no such kw arg
-        check(test=1)
+        with self.assertRaisesRegex(TypeError, r"str\(\) got an unexpected keyword argument 'test'"):
+            str(test=1)
 
         # 'encoding' must be str
-        check(1, encoding=1)
-        check(1, 1)
+        with self.assertRaisesRegex(TypeError, r"str\(\) argument 'encoding' must be str, not int"):
+            str(1, 1)
+        with self.assertRaisesRegex(TypeError, r"str\(\) argument 'encoding' must be str, not int"):
+            str(1, encoding=1)
+        with self.assertRaisesRegex(TypeError, r"str\(\) argument 'encoding' must be str, not bytes"):
+            str(b"x", b"ascii")
+        with self.assertRaisesRegex(TypeError, r"str\(\) argument 'encoding' must be str, not bytes"):
+            str(b"x", encoding=b"ascii")
 
         # 'errors' must be str
-        check(1, errors=1)
-        check(1, "", errors=1)
-        check(1, 1, 1)
+        with self.assertRaisesRegex(TypeError, r"str\(\) argument 'encoding' must be str, not int"):
+            str(1, 1, 1)
+        with self.assertRaisesRegex(TypeError, r"str\(\) argument 'errors' must be str, not int"):
+            str(1, errors=1)
+        with self.assertRaisesRegex(TypeError, r"str\(\) argument 'errors' must be str, not int"):
+            str(1, "", errors=1)
+        with self.assertRaisesRegex(TypeError, r"str\(\) argument 'errors' must be str, not bytes"):
+            str(b"x", "ascii", b"strict")
+        with self.assertRaisesRegex(TypeError, r"str\(\) argument 'errors' must be str, not bytes"):
+            str(b"x", "ascii", errors=b"strict")
+
+        # both positional and kwarg
+        with self.assertRaisesRegex(TypeError, r"argument for str\(\) given by name \('encoding'\) and position \(2\)"):
+            str(b"x", "utf-8", encoding="ascii")
+        with self.assertRaisesRegex(TypeError, r"str\(\) takes at most 3 arguments \(4 given\)"):
+            str(b"x", "utf-8", "ignore", encoding="ascii")
+        with self.assertRaisesRegex(TypeError, r"str\(\) takes at most 3 arguments \(4 given\)"):
+            str(b"x", "utf-8", "strict", errors="ignore")
 
 
 class StringModuleTest(unittest.TestCase):