[3.12] gh-111495: Add tests for PyFloat C API (GH-111624) (GH-111752)

(cherry picked from commit b452202a11)

Co-authored-by: Sergey B Kirpichev <skirpichev@gmail.com>

Modules/_testcapi/float.c

@@ -1,9 +1,75 @@
 #define PY_SSIZE_T_CLEAN
 
 #include "parts.h"
+#include "util.h"
 #include "clinic/float.c.h"
 
 
+static PyObject *
+float_check(PyObject *Py_UNUSED(module), PyObject *obj)
+{
+    NULLABLE(obj);
+    return PyLong_FromLong(PyFloat_Check(obj));
+}
+
+static PyObject *
+float_checkexact(PyObject *Py_UNUSED(module), PyObject *obj)
+{
+    NULLABLE(obj);
+    return PyLong_FromLong(PyFloat_CheckExact(obj));
+}
+
+static PyObject *
+float_fromstring(PyObject *Py_UNUSED(module), PyObject *obj)
+{
+    NULLABLE(obj);
+    return PyFloat_FromString(obj);
+}
+
+static PyObject *
+float_fromdouble(PyObject *Py_UNUSED(module), PyObject *obj)
+{
+    double d;
+
+    if (!PyArg_Parse(obj, "d", &d)) {
+        return NULL;
+    }
+
+    return PyFloat_FromDouble(d);
+}
+
+static PyObject *
+float_asdouble(PyObject *Py_UNUSED(module), PyObject *obj)
+{
+    double d;
+
+    NULLABLE(obj);
+    d = PyFloat_AsDouble(obj);
+    if (d == -1. && PyErr_Occurred()) {
+        return NULL;
+    }
+
+    return PyFloat_FromDouble(d);
+}
+
+static PyObject *
+float_getinfo(PyObject *Py_UNUSED(module), PyObject *Py_UNUSED(arg))
+{
+    return PyFloat_GetInfo();
+}
+
+static PyObject *
+float_getmax(PyObject *Py_UNUSED(module), PyObject *Py_UNUSED(arg))
+{
+    return PyFloat_FromDouble(PyFloat_GetMax());
+}
+
+static PyObject *
+float_getmin(PyObject *Py_UNUSED(module), PyObject *Py_UNUSED(arg))
+{
+    return PyFloat_FromDouble(PyFloat_GetMin());
+}
+
 /*[clinic input]
 module _testcapi
 [clinic start generated code]*/
@@ -98,6 +164,14 @@ _testcapi_float_unpack_impl(PyObject *module, const char *data,
 }
 
 static PyMethodDef test_methods[] = {
+    {"float_check", float_check, METH_O},
+    {"float_checkexact", float_checkexact, METH_O},
+    {"float_fromstring", float_fromstring, METH_O},
+    {"float_fromdouble", float_fromdouble, METH_O},
+    {"float_asdouble", float_asdouble, METH_O},
+    {"float_getinfo", float_getinfo, METH_NOARGS},
+    {"float_getmax", float_getmax, METH_NOARGS},
+    {"float_getmin", float_getmin, METH_NOARGS},
     _TESTCAPI_FLOAT_PACK_METHODDEF
     _TESTCAPI_FLOAT_UNPACK_METHODDEF
     {NULL},