TEST_WIDE
TEST_WIDE(fwide(f, 1));
TEST_WIDE(getwc(f));
TEST_WIDE(fgetwc(f));
TEST_WIDE(wc = fgetwc(f); ungetwc(wc, f));
TEST_WIDE(fgetws(wbuffer, BUFSIZ, f));
TEST_WIDE(fwscanf(f, L"%s\n", wbuffer));
TEST_WIDE(putwc(L'c', f));
TEST_WIDE(fputwc(L'c', f));
TEST_WIDE(fputws(L"foo", f));
TEST_WIDE(fwprintf(f, L"%s\n", L"foo"));