test_wrap_ext
val = test_wrap_ext(c1, hc1, c2, hc2, 1, 0);
val = test_wrap_ext(c2, hc2, c1, hc1, 1, 0);
val = test_wrap_ext(c1, hc1, c2, hc2, 1, 1);
val = test_wrap_ext(c2, hc2, c1, hc1, 1, 1);
val = test_wrap_ext(c1, hc1, c2, hc2, 0, 0);
val = test_wrap_ext(c2, hc2, c1, hc1, 0, 0);
val = test_wrap_ext(c1, hc1, c2, hc2, 0, 1);
val = test_wrap_ext(c2, hc2, c1, hc1, 0, 1);