gh-93649: Move _testcapi tests to specific files (#129544)

Move many functions from _testcapimodule.c into more specific files
in Modules/_testcapi/.

In moved code:

* Replace get_testerror() with PyExc_AssertionError.
* Replace raiseTestError() with
  PyErr_Format(PyExc_AssertionError, ...).

Lib/test/test_capi/test_misc.py

@@ -403,42 +403,6 @@ def test_buildvalue_ints(self):
     def test_buildvalue_N(self):
         _testcapi.test_buildvalue_N()
 
-    def check_negative_refcount(self, code):
-        # bpo-35059: Check that Py_DECREF() reports the correct filename
-        # when calling _Py_NegativeRefcount() to abort Python.
-        code = textwrap.dedent(code)
-        rc, out, err = assert_python_failure('-c', code)
-        self.assertRegex(err,
-                         br'_testcapimodule\.c:[0-9]+: '
-                         br'_Py_NegativeRefcount: Assertion failed: '
-                         br'object has negative ref count')
-
-    @unittest.skipUnless(hasattr(_testcapi, 'negative_refcount'),
-                         'need _testcapi.negative_refcount()')
-    def test_negative_refcount(self):
-        code = """
-            import _testcapi
-            from test import support
-
-            with support.SuppressCrashReport():
-                _testcapi.negative_refcount()
-        """
-        self.check_negative_refcount(code)
-
-    @unittest.skipUnless(hasattr(_testcapi, 'decref_freed_object'),
-                         'need _testcapi.decref_freed_object()')
-    @support.skip_if_sanitizer("use after free on purpose",
-                               address=True, memory=True, ub=True)
-    def test_decref_freed_object(self):
-        code = """
-            import _testcapi
-            from test import support
-
-            with support.SuppressCrashReport():
-                _testcapi.decref_freed_object()
-        """
-        self.check_negative_refcount(code)
-
     def test_trashcan_subclass(self):
         # bpo-35983: Check that the trashcan mechanism for "list" is NOT
         # activated when its tp_dealloc is being called by a subclass

Lib/test/test_capi/test_object.py

@@ -1,9 +1,12 @@
 import enum
+import textwrap
 import unittest
 from test import support
 from test.support import import_helper
 from test.support import os_helper
 from test.support import threading_helper
+from test.support.script_helper import assert_python_failure
+
 
 _testlimitedcapi = import_helper.import_module('_testlimitedcapi')
 _testcapi = import_helper.import_module('_testcapi')
@@ -170,5 +173,42 @@ def silly_func(obj):
             self.assertTrue(_testinternalcapi.has_deferred_refcount(silly_list))
 
 
+class CAPITest(unittest.TestCase):
+    def check_negative_refcount(self, code):
+        # bpo-35059: Check that Py_DECREF() reports the correct filename
+        # when calling _Py_NegativeRefcount() to abort Python.
+        code = textwrap.dedent(code)
+        rc, out, err = assert_python_failure('-c', code)
+        self.assertRegex(err,
+                         br'object\.c:[0-9]+: '
+                         br'_Py_NegativeRefcount: Assertion failed: '
+                         br'object has negative ref count')
+
+    @unittest.skipUnless(hasattr(_testcapi, 'negative_refcount'),
+                         'need _testcapi.negative_refcount()')
+    def test_negative_refcount(self):
+        code = """
+            import _testcapi
+            from test import support
+
+            with support.SuppressCrashReport():
+                _testcapi.negative_refcount()
+        """
+        self.check_negative_refcount(code)
+
+    @unittest.skipUnless(hasattr(_testcapi, 'decref_freed_object'),
+                         'need _testcapi.decref_freed_object()')
+    @support.skip_if_sanitizer("use after free on purpose",
+                               address=True, memory=True, ub=True)
+    def test_decref_freed_object(self):
+        code = """
+            import _testcapi
+            from test import support
+
+            with support.SuppressCrashReport():
+                _testcapi.decref_freed_object()
+        """
+        self.check_negative_refcount(code)
+
 if __name__ == "__main__":
     unittest.main()

Modules/_testcapi/dict.c

@@ -181,6 +181,83 @@ dict_popstring_null(PyObject *self, PyObject *args)
     RETURN_INT(PyDict_PopString(dict, key,  NULL));
 }
 
+
+static int
+test_dict_inner(PyObject *self, int count)
+{
+    Py_ssize_t pos = 0, iterations = 0;
+    int i;
+    PyObject *dict = PyDict_New();
+    PyObject *v, *k;
+
+    if (dict == NULL)
+        return -1;
+
+    for (i = 0; i < count; i++) {
+        v = PyLong_FromLong(i);
+        if (v == NULL) {
+            goto error;
+        }
+        if (PyDict_SetItem(dict, v, v) < 0) {
+            Py_DECREF(v);
+            goto error;
+        }
+        Py_DECREF(v);
+    }
+
+    k = v = UNINITIALIZED_PTR;
+    while (PyDict_Next(dict, &pos, &k, &v)) {
+        PyObject *o;
+        iterations++;
+
+        assert(k != UNINITIALIZED_PTR);
+        assert(v != UNINITIALIZED_PTR);
+        i = PyLong_AS_LONG(v) + 1;
+        o = PyLong_FromLong(i);
+        if (o == NULL) {
+            goto error;
+        }
+        if (PyDict_SetItem(dict, k, o) < 0) {
+            Py_DECREF(o);
+            goto error;
+        }
+        Py_DECREF(o);
+        k = v = UNINITIALIZED_PTR;
+    }
+    assert(k == UNINITIALIZED_PTR);
+    assert(v == UNINITIALIZED_PTR);
+
+    Py_DECREF(dict);
+
+    if (iterations != count) {
+        PyErr_SetString(
+            PyExc_AssertionError,
+            "test_dict_iteration: dict iteration went wrong ");
+        return -1;
+    } else {
+        return 0;
+    }
+error:
+    Py_DECREF(dict);
+    return -1;
+}
+
+
+static PyObject*
+test_dict_iteration(PyObject* self, PyObject *Py_UNUSED(ignored))
+{
+    int i;
+
+    for (i = 0; i < 200; i++) {
+        if (test_dict_inner(self, i) < 0) {
+            return NULL;
+        }
+    }
+
+    Py_RETURN_NONE;
+}
+
+
 static PyMethodDef test_methods[] = {
     {"dict_containsstring", dict_containsstring, METH_VARARGS},
     {"dict_getitemref", dict_getitemref, METH_VARARGS},
@@ -191,6 +268,7 @@ static PyMethodDef test_methods[] = {
     {"dict_pop_null", dict_pop_null, METH_VARARGS},
     {"dict_popstring", dict_popstring, METH_VARARGS},
     {"dict_popstring_null", dict_popstring_null, METH_VARARGS},
+    {"test_dict_iteration",     test_dict_iteration,             METH_NOARGS},
     {NULL},
 };
 

Modules/_testcapi/float.c

@@ -99,9 +99,68 @@ _testcapi_float_unpack_impl(PyObject *module, const char *data,
     return PyFloat_FromDouble(d);
 }
 
+
+/* Test PyOS_string_to_double. */
+static PyObject *
+test_string_to_double(PyObject *self, PyObject *Py_UNUSED(ignored))
+{
+    double result;
+    const char *msg;
+
+#define CHECK_STRING(STR, expected) \
+    do { \
+        result = PyOS_string_to_double(STR, NULL, NULL); \
+        if (result == -1.0 && PyErr_Occurred()) { \
+            return NULL; \
+        } \
+        if (result != (double)expected) { \
+            msg = "conversion of " STR " to float failed"; \
+            goto fail; \
+        } \
+    } while (0)
+
+#define CHECK_INVALID(STR) \
+    do { \
+        result = PyOS_string_to_double(STR, NULL, NULL); \
+        if (result == -1.0 && PyErr_Occurred()) { \
+            if (PyErr_ExceptionMatches(PyExc_ValueError)) { \
+                PyErr_Clear(); \
+            } \
+            else { \
+                return NULL; \
+            } \
+        } \
+        else { \
+            msg = "conversion of " STR " didn't raise ValueError"; \
+            goto fail; \
+        } \
+    } while (0)
+
+    CHECK_STRING("0.1", 0.1);
+    CHECK_STRING("1.234", 1.234);
+    CHECK_STRING("-1.35", -1.35);
+    CHECK_STRING(".1e01", 1.0);
+    CHECK_STRING("2.e-2", 0.02);
+
+    CHECK_INVALID(" 0.1");
+    CHECK_INVALID("\t\n-3");
+    CHECK_INVALID(".123 ");
+    CHECK_INVALID("3\n");
+    CHECK_INVALID("123abc");
+
+    Py_RETURN_NONE;
+  fail:
+    PyErr_Format(PyExc_AssertionError, "test_string_to_double: %s", msg);
+    return NULL;
+#undef CHECK_STRING
+#undef CHECK_INVALID
+}
+
+
 static PyMethodDef test_methods[] = {
     _TESTCAPI_FLOAT_PACK_METHODDEF
     _TESTCAPI_FLOAT_UNPACK_METHODDEF
+    {"test_string_to_double", test_string_to_double, METH_NOARGS},
     {NULL},
 };
 

Modules/_testcapi/list.c

@@ -60,22 +60,61 @@ list_extend(PyObject* Py_UNUSED(module), PyObject *args)
 }
 
 
+static PyObject*
+test_list_api(PyObject *self, PyObject *Py_UNUSED(ignored))
+{
+    PyObject* list;
+    int i;
+
+    /* SF bug 132008:  PyList_Reverse segfaults */
+#define NLIST 30
+    list = PyList_New(NLIST);
+    if (list == (PyObject*)NULL)
+        return (PyObject*)NULL;
+    /* list = range(NLIST) */
+    for (i = 0; i < NLIST; ++i) {
+        PyObject* anint = PyLong_FromLong(i);
+        if (anint == (PyObject*)NULL) {
+            Py_DECREF(list);
+            return (PyObject*)NULL;
+        }
+        PyList_SET_ITEM(list, i, anint);
+    }
+    /* list.reverse(), via PyList_Reverse() */
+    i = PyList_Reverse(list);   /* should not blow up! */
+    if (i != 0) {
+        Py_DECREF(list);
+        return (PyObject*)NULL;
+    }
+    /* Check that list == range(29, -1, -1) now */
+    for (i = 0; i < NLIST; ++i) {
+        PyObject* anint = PyList_GET_ITEM(list, i);
+        if (PyLong_AS_LONG(anint) != NLIST-1-i) {
+            PyErr_SetString(PyExc_AssertionError,
+                            "test_list_api: reverse screwed up");
+            Py_DECREF(list);
+            return (PyObject*)NULL;
+        }
+    }
+    Py_DECREF(list);
+#undef NLIST
+
+    Py_RETURN_NONE;
+}
+
+
 static PyMethodDef test_methods[] = {
     {"list_get_size", list_get_size, METH_O},
     {"list_get_item", list_get_item, METH_VARARGS},
     {"list_set_item", list_set_item, METH_VARARGS},
     {"list_clear", list_clear, METH_O},
     {"list_extend", list_extend, METH_VARARGS},
-
+    {"test_list_api", test_list_api, METH_NOARGS},
     {NULL},
 };
 
 int
 _PyTestCapi_Init_List(PyObject *m)
 {
-    if (PyModule_AddFunctions(m, test_methods) < 0) {
-        return -1;
-    }
-
-    return 0;
+    return PyModule_AddFunctions(m, test_methods);
 }