From 5623ac87bbe5de481957eca5eeae06347612fbeb Mon Sep 17 00:00:00 2001
From: Hai Shi <shihai1992@gmail.com>
Date: Sat, 20 Jul 2019 02:56:23 -0500
Subject: bpo-37476: Adding tests for asutf8 and asutf8andsize (GH-14531)

---
 Lib/test/test_unicode.py  | 28 ++++++++++++++++++++++++++++
 Modules/_testcapimodule.c | 44 ++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 72 insertions(+)

diff --git a/Lib/test/test_unicode.py b/Lib/test/test_unicode.py
index 177d80d..8be16c8 100644
--- a/Lib/test/test_unicode.py
+++ b/Lib/test/test_unicode.py
@@ -2819,6 +2819,34 @@ class CAPITest(unittest.TestCase):
             self.assertEqual(unicode_asucs4(s, len(s), 1), s+'\0')
             self.assertEqual(unicode_asucs4(s, len(s), 0), s+'\uffff')
 
+    # Test PyUnicode_AsUTF8()
+    @support.cpython_only
+    def test_asutf8(self):
+        from _testcapi import unicode_asutf8
+
+        bmp = '\u0100'
+        bmp2 = '\uffff'
+        nonbmp = chr(0x10ffff)
+
+        self.assertEqual(unicode_asutf8(bmp), b'\xc4\x80')
+        self.assertEqual(unicode_asutf8(bmp2), b'\xef\xbf\xbf')
+        self.assertEqual(unicode_asutf8(nonbmp), b'\xf4\x8f\xbf\xbf')
+        self.assertRaises(UnicodeEncodeError, unicode_asutf8, 'a\ud800b\udfffc')
+
+    # Test PyUnicode_AsUTF8AndSize()
+    @support.cpython_only
+    def test_asutf8andsize(self):
+        from _testcapi import unicode_asutf8andsize
+
+        bmp = '\u0100'
+        bmp2 = '\uffff'
+        nonbmp = chr(0x10ffff)
+
+        self.assertEqual(unicode_asutf8andsize(bmp), (b'\xc4\x80', 2))
+        self.assertEqual(unicode_asutf8andsize(bmp2), (b'\xef\xbf\xbf', 3))
+        self.assertEqual(unicode_asutf8andsize(nonbmp), (b'\xf4\x8f\xbf\xbf', 4))
+        self.assertRaises(UnicodeEncodeError, unicode_asutf8andsize, 'a\ud800b\udfffc')
+
     # Test PyUnicode_FindChar()
     @support.cpython_only
     def test_findchar(self):
diff --git a/Modules/_testcapimodule.c b/Modules/_testcapimodule.c
index 8f34e93..8a6e741 100644
--- a/Modules/_testcapimodule.c
+++ b/Modules/_testcapimodule.c
@@ -1922,6 +1922,48 @@ unicode_asucs4(PyObject *self, PyObject *args)
 }
 
 static PyObject *
+unicode_asutf8(PyObject *self, PyObject *args)
+{
+    PyObject *unicode;
+    const char *buffer;
+
+    if (!PyArg_ParseTuple(args, "U", &unicode)) {
+        return NULL;
+    }
+
+    buffer = PyUnicode_AsUTF8(unicode);
+    if (buffer == NULL) {
+        return NULL;
+    }
+
+    return PyBytes_FromString(buffer);
+}
+
+static PyObject *
+unicode_asutf8andsize(PyObject *self, PyObject *args)
+{
+    PyObject *unicode, *result;
+    const char *buffer;
+    Py_ssize_t utf8_len;
+
+    if(!PyArg_ParseTuple(args, "U", &unicode)) {
+        return NULL;
+    }
+
+    buffer = PyUnicode_AsUTF8AndSize(unicode, &utf8_len); 
+    if (buffer == NULL) {
+        return NULL;
+    }
+
+    result = PyBytes_FromString(buffer);
+    if (result == NULL) {
+        return NULL;
+    }
+
+    return Py_BuildValue("(Nn)", result, utf8_len);
+}
+
+static PyObject *
 unicode_findchar(PyObject *self, PyObject *args)
 {
     PyObject *str;
@@ -5174,6 +5216,8 @@ static PyMethodDef TestMethods[] = {
     {"unicode_aswidechar",      unicode_aswidechar,              METH_VARARGS},
     {"unicode_aswidecharstring",unicode_aswidecharstring,        METH_VARARGS},
     {"unicode_asucs4",          unicode_asucs4,                  METH_VARARGS},
+    {"unicode_asutf8",          unicode_asutf8,                  METH_VARARGS},
+    {"unicode_asutf8andsize",   unicode_asutf8andsize,           METH_VARARGS},
     {"unicode_findchar",        unicode_findchar,                METH_VARARGS},
     {"unicode_copycharacters",  unicode_copycharacters,          METH_VARARGS},
     {"unicode_encodedecimal",   unicode_encodedecimal,           METH_VARARGS},
-- 
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