gh-110525: Add tests for internal set CAPI (GH-110630)

Modules/Setup.stdlib.in

@@ -158,7 +158,7 @@
 @MODULE_XXSUBTYPE_TRUE@xxsubtype xxsubtype.c
 @MODULE__XXTESTFUZZ_TRUE@_xxtestfuzz _xxtestfuzz/_xxtestfuzz.c _xxtestfuzz/fuzzer.c
 @MODULE__TESTBUFFER_TRUE@_testbuffer _testbuffer.c
-@MODULE__TESTINTERNALCAPI_TRUE@_testinternalcapi _testinternalcapi.c _testinternalcapi/test_lock.c _testinternalcapi/pytime.c
+@MODULE__TESTINTERNALCAPI_TRUE@_testinternalcapi _testinternalcapi.c _testinternalcapi/test_lock.c _testinternalcapi/pytime.c _testinternalcapi/set.c
 @MODULE__TESTCAPI_TRUE@_testcapi _testcapimodule.c _testcapi/vectorcall.c _testcapi/vectorcall_limited.c _testcapi/heaptype.c _testcapi/abstract.c _testcapi/unicode.c _testcapi/dict.c _testcapi/set.c _testcapi/getargs.c _testcapi/datetime.c _testcapi/docstring.c _testcapi/mem.c _testcapi/watchers.c _testcapi/long.c _testcapi/float.c _testcapi/structmember.c _testcapi/exceptions.c _testcapi/code.c _testcapi/buffer.c _testcapi/pyatomic.c _testcapi/pyos.c _testcapi/immortal.c _testcapi/heaptype_relative.c _testcapi/gc.c
 @MODULE__TESTCLINIC_TRUE@_testclinic _testclinic.c
 @MODULE__TESTCLINIC_LIMITED_TRUE@_testclinic_limited _testclinic_limited.c

Modules/_testinternalcapi.c

@@ -1602,6 +1602,9 @@ module_exec(PyObject *module)
     if (_PyTestInternalCapi_Init_PyTime(module) < 0) {
         return 1;
     }
+    if (_PyTestInternalCapi_Init_Set(module) < 0) {
+        return 1;
+    }
 
     if (PyModule_Add(module, "SIZEOF_PYGC_HEAD",
                         PyLong_FromSsize_t(sizeof(PyGC_Head))) < 0) {

Modules/_testinternalcapi/parts.h

@@ -12,5 +12,6 @@
 
 int _PyTestInternalCapi_Init_Lock(PyObject *module);
 int _PyTestInternalCapi_Init_PyTime(PyObject *module);
+int _PyTestInternalCapi_Init_Set(PyObject *module);
 
 #endif // Py_TESTINTERNALCAPI_PARTS_H

Modules/_testinternalcapi/set.c

@@ -0,0 +1,59 @@
+#include "parts.h"
+#include "../_testcapi/util.h"  // NULLABLE, RETURN_INT
+
+#include "pycore_setobject.h"
+
+
+static PyObject *
+set_update(PyObject *self, PyObject *args)
+{
+    PyObject *set, *iterable;
+    if (!PyArg_ParseTuple(args, "OO", &set, &iterable)) {
+        return NULL;
+    }
+    NULLABLE(set);
+    NULLABLE(iterable);
+    RETURN_INT(_PySet_Update(set, iterable));
+}
+
+static PyObject *
+set_next_entry(PyObject *self, PyObject *args)
+{
+    int rc;
+    Py_ssize_t pos;
+    Py_hash_t hash = (Py_hash_t)UNINITIALIZED_SIZE;
+    PyObject *set, *item = UNINITIALIZED_PTR;
+    if (!PyArg_ParseTuple(args, "On", &set, &pos)) {
+        return NULL;
+    }
+    NULLABLE(set);
+
+    rc = _PySet_NextEntry(set, &pos, &item, &hash);
+    if (rc == 1) {
+        return Py_BuildValue("innO", rc, pos, hash, item);
+    }
+    assert(item == UNINITIALIZED_PTR);
+    assert(hash == (Py_hash_t)UNINITIALIZED_SIZE);
+    if (rc == -1) {
+        return NULL;
+    }
+    assert(rc == 0);
+    Py_RETURN_NONE;
+}
+
+
+static PyMethodDef TestMethods[] = {
+    {"set_update", set_update, METH_VARARGS},
+    {"set_next_entry", set_next_entry, METH_VARARGS},
+
+    {NULL},
+};
+
+int
+_PyTestInternalCapi_Init_Set(PyObject *m)
+{
+    if (PyModule_AddFunctions(m, TestMethods) < 0) {
+        return -1;
+    }
+    return 0;
+}