[Python-checkins] bpo-44984: Rewrite test_null_strings in _testcapi (GH-27904)

[miss-islington]

https://github.com/python/cpython/commit/6ff7fefc914541ec5afdd3c8193da80818cb0817
commit: 6ff7fefc914541ec5afdd3c8193da80818cb0817
branch: 3.10
author: Miss Islington (bot) <31488909+miss-islington at users.noreply.github.com>
committer: miss-islington <31488909+miss-islington at users.noreply.github.com>
date: 2021-08-23T12:30:21-07:00
summary:

bpo-44984: Rewrite test_null_strings in _testcapi (GH-27904)


Test also PyObject_Repr(NULL) and PyObject_Bytes(NULL).
(cherry picked from commit 4d689173861257c69adc6dc1dca4171946ddb57f)

Co-authored-by: Serhiy Storchaka <storchaka at gmail.com>

files:
M Lib/test/test_capi.py
M Modules/_testcapimodule.c

diff --git a/Lib/test/test_capi.py b/Lib/test/test_capi.py
index f9c5aca728b433..5f78c337028a99 100644
--- a/Lib/test/test_capi.py
+++ b/Lib/test/test_capi.py
@@ -619,6 +619,18 @@ def test_fatal_error(self):
         ''')
         self.check_fatal_error(code, expected)
 
+    def test_pyobject_repr_from_null(self):
+        s = _testcapi.pyobject_repr_from_null()
+        self.assertEqual(s, '<NULL>')
+
+    def test_pyobject_str_from_null(self):
+        s = _testcapi.pyobject_str_from_null()
+        self.assertEqual(s, '<NULL>')
+
+    def test_pyobject_bytes_from_null(self):
+        s = _testcapi.pyobject_bytes_from_null()
+        self.assertEqual(s, b'<NULL>')
+
 
 class TestPendingCalls(unittest.TestCase):
 
diff --git a/Modules/_testcapimodule.c b/Modules/_testcapimodule.c
index ef1fb71cc90487..103bd4062292db 100644
--- a/Modules/_testcapimodule.c
+++ b/Modules/_testcapimodule.c
@@ -2342,16 +2342,22 @@ test_long_numbits(PyObject *self, PyObject *Py_UNUSED(ignored))
     Py_RETURN_NONE;
 }
 
-/* Example passing NULLs to PyObject_Str(NULL). */
+static PyObject *
+pyobject_repr_from_null(PyObject *self, PyObject *Py_UNUSED(ignored))
+{
+    return PyObject_Repr(NULL);
+}
 
 static PyObject *
-test_null_strings(PyObject *self, PyObject *Py_UNUSED(ignored))
+pyobject_str_from_null(PyObject *self, PyObject *Py_UNUSED(ignored))
 {
-    PyObject *o1 = PyObject_Str(NULL), *o2 = PyObject_Str(NULL);
-    PyObject *tuple = PyTuple_Pack(2, o1, o2);
-    Py_XDECREF(o1);
-    Py_XDECREF(o2);
-    return tuple;
+    return PyObject_Str(NULL);
+}
+
+static PyObject *
+pyobject_bytes_from_null(PyObject *self, PyObject *Py_UNUSED(ignored))
+{
+    return PyObject_Bytes(NULL);
 }
 
 static PyObject *
@@ -5653,7 +5659,9 @@ static PyMethodDef TestMethods[] = {
     {"test_k_code",             test_k_code,                     METH_NOARGS},
     {"test_empty_argparse",     test_empty_argparse,             METH_NOARGS},
     {"parse_tuple_and_keywords", parse_tuple_and_keywords, METH_VARARGS},
-    {"test_null_strings",       test_null_strings,               METH_NOARGS},
+    {"pyobject_repr_from_null", pyobject_repr_from_null, METH_NOARGS},
+    {"pyobject_str_from_null",  pyobject_str_from_null, METH_NOARGS},
+    {"pyobject_bytes_from_null", pyobject_bytes_from_null, METH_NOARGS},
     {"test_string_from_format", (PyCFunction)test_string_from_format, METH_NOARGS},
     {"test_with_docstring",     test_with_docstring,             METH_NOARGS,
      PyDoc_STR("This is a pretty normal docstring.")},