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import unittest
from ctypes import *
import _ctypes_test
lib = CDLL(_ctypes_test.__file__)
def three_way_cmp(x, y):
"""Return -1 if x < y, 0 if x == y and 1 if x > y"""
return (x > y) - (x < y)
class LibTest(unittest.TestCase):
def test_sqrt(self):
lib.my_sqrt.argtypes = c_double,
lib.my_sqrt.restype = c_double
self.assertEqual(lib.my_sqrt(4.0), 2.0)
import math
self.assertEqual(lib.my_sqrt(2.0), math.sqrt(2.0))
def test_qsort(self):
comparefunc = CFUNCTYPE(c_int, POINTER(c_char), POINTER(c_char))
lib.my_qsort.argtypes = c_void_p, c_size_t, c_size_t, comparefunc
lib.my_qsort.restype = None
def sort(a, b):
return three_way_cmp(a[0], b[0])
chars = create_string_buffer(b"spam, spam, and spam")
lib.my_qsort(chars, len(chars)-1, sizeof(c_char), comparefunc(sort))
self.assertEqual(chars.raw, b" ,,aaaadmmmnpppsss\x00")
if __name__ == "__main__":
unittest.main()
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