Fix linking on windows and refactor test

Author: StanFromIreland

Include/internal/pycore_unicodeobject.h

@@ -77,8 +77,8 @@ _PyUnicodeWriter_WriteCharInline(_PyUnicodeWriter *writer, Py_UCS4 ch)
 
 /* --- Characters Type APIs ----------------------------------------------- */
 
-extern int _PyUnicode_IsXidStart(Py_UCS4 ch);
-extern int _PyUnicode_IsXidContinue(Py_UCS4 ch);
+PyAPI_FUNC(int) _PyUnicode_IsXidStart(Py_UCS4 ch);
+PyAPI_FUNC(int) _PyUnicode_IsXidContinue(Py_UCS4 ch);
 extern int _PyUnicode_ToLowerFull(Py_UCS4 ch, Py_UCS4 *res);
 extern int _PyUnicode_ToTitleFull(Py_UCS4 ch, Py_UCS4 *res);
 extern int _PyUnicode_ToUpperFull(Py_UCS4 ch, Py_UCS4 *res);

Lib/test/test_unicodedata.py

@@ -285,6 +285,7 @@ def test_isidstart(self):
         self.assertTrue(self.db.isidstart('\uFE7B'))  # ARABIC KASRA MEDIAL FORM
 
         self.assertFalse(self.db.isidstart(' '))
+        self.assertFalse(self.db.isidstart('0'))
         self.assertRaises(TypeError, self.db.isidstart)
         self.assertRaises(TypeError, self.db.isidstart, 'xx')
 
@@ -299,7 +300,6 @@ def test_isidcontinue(self):
         self.assertTrue(self.db.isidcontinue('\u17D7'))  # KHMER SIGN LEK TOO
 
         self.assertFalse(self.db.isidcontinue(' '))
-        self.assertFalse(self.db.isidstart('0'))
         self.assertRaises(TypeError, self.db.isidcontinue)
         self.assertRaises(TypeError, self.db.isidcontinue, 'xx')