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/*
* Ouroboros - Copyright (C) 2016 - 2026
*
* Unit tests for link capacity codes
*
* Dimitri Staessens <dimitri@ouroboros.rocks>
* Sander Vrijders <sander@ouroboros.rocks>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., http://www.fsf.org/about/contact/.
*/
#include "cap.c"
#include <test/test.h>
/* Exact roundtrip holds for codes >= 32 (rates >= 256 B/s). */
static int test_cap_codec_roundtrip(void)
{
unsigned c;
TEST_START();
for (c = 32; c <= 255; c++) {
if (cap_enc(cap_dec((uint8_t) c)) != c) {
printf("Code %u does not roundtrip.\n", c);
goto fail;
}
if (cap_dec((uint8_t) c) <= cap_dec((uint8_t) (c - 1))) {
printf("Decode not monotone at %u.\n", c);
goto fail;
}
}
TEST_SUCCESS();
return TEST_RC_SUCCESS;
fail:
TEST_FAIL();
return TEST_RC_FAIL;
}
static int test_cap_codec_bounds(void)
{
TEST_START();
if (cap_enc(0) != 0 || cap_dec(0) != 0) {
printf("Zero is not unknown.\n");
goto fail;
}
if (cap_enc(1) != 1) {
printf("Rate 1 encoded as %u.\n", cap_enc(1));
goto fail;
}
if (cap_enc(UINT64_MAX) != 255) {
printf("Max rate encoded as %u.\n", cap_enc(UINT64_MAX));
goto fail;
}
if (cap_dec(255) <= cap_dec(254)) {
printf("Top code does not decode.\n");
goto fail;
}
TEST_SUCCESS();
return TEST_RC_SUCCESS;
fail:
TEST_FAIL();
return TEST_RC_FAIL;
}
static int test_cap_min(void)
{
TEST_START();
if (cap_min(0, 42) != 42 || cap_min(42, 0) != 42) {
printf("Unknown not skipped in min.\n");
goto fail;
}
if (cap_min(0, 0) != 0) {
printf("Two unknowns not unknown.\n");
goto fail;
}
if (cap_min(97, 42) != 42 || cap_min(42, 97) != 42) {
printf("Min not taken.\n");
goto fail;
}
TEST_SUCCESS();
return TEST_RC_SUCCESS;
fail:
TEST_FAIL();
return TEST_RC_FAIL;
}
static int test_cap_stamp(void)
{
uint8_t pci;
TEST_START();
pci = 42;
cap_stamp(&pci, 0);
if (pci != 42) {
printf("Unknown own code overwrote the byte.\n");
goto fail;
}
pci = 0;
cap_stamp(&pci, 97);
if (pci != 97) {
printf("Own code not written into unknown.\n");
goto fail;
}
pci = 97;
cap_stamp(&pci, 42);
if (pci != 42) {
printf("Lower own code did not lower the byte.\n");
goto fail;
}
pci = 42;
cap_stamp(&pci, 97);
if (pci != 42) {
printf("Higher own code raised the byte.\n");
goto fail;
}
TEST_SUCCESS();
return TEST_RC_SUCCESS;
fail:
TEST_FAIL();
return TEST_RC_FAIL;
}
int cap_test(int argc,
char ** argv)
{
int ret = 0;
(void) argc;
(void) argv;
ret |= test_cap_codec_roundtrip();
ret |= test_cap_codec_bounds();
ret |= test_cap_min();
ret |= test_cap_stamp();
return ret;
}
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