gh-94808: Add test coverage for PyObject_HasAttrString (#96627)

* gh-94808: Add test for HasAttrString

* Harmonize to Python C code style guidelines

* Add check to verify no exception thrown

1 files changed, 14 insertions, 0 deletions

diff --git a/Lib/test/test_class.py b/Lib/test/test_class.py
index 91c53b7..61df81b 100644
--- a/Lib/test/test_class.py
+++ b/Lib/test/test_class.py
@@ -445,6 +445,20 @@ class ClassTests(unittest.TestCase):
         del testme.cardinal
         self.assertCallStack([('__delattr__', (testme, "cardinal"))])
 
+    def testHasAttrString(self):
+        import sys
+        from test.support import import_helper
+        _testcapi = import_helper.import_module('_testcapi')
+
+        class A:
+            def __init__(self):
+                self.attr = 1
+
+        a = A()
+        self.assertEqual(_testcapi.hasattr_string(a, "attr"), True)
+        self.assertEqual(_testcapi.hasattr_string(a, "noattr"), False)
+        self.assertEqual(sys.exc_info(), (None, None, None))
+
     def testDel(self):
         x = []