src/tests/bitmath_func.cpp

   1 /*
   2  * This file is part of OpenTTD.
   3  * OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
   4  * OpenTTD 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.
   5  * See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
   6  */
   7
   8 /** @file bitmath_func.cpp Test functionality from core/bitmath_func. */
   9
  10 #include "../stdafx.h"
  11
  12 #include "../3rdparty/catch2/catch.hpp"
  13
  14 #include "../core/bitmath_func.hpp"
  15
  16 TEST_CASE("SetBitIterator tests")
  17 {
  18         auto test_case = [&](auto input, std::initializer_list<uint> expected) {
  19                 auto iter = expected.begin();
  20                 for (auto bit : SetBitIterator(input)) {
  21                         if (iter == expected.end()) return false;
  22                         if (bit != *iter) return false;
  23                         ++iter;
  24                 }
  25                 return iter == expected.end();
  26         };
  27         CHECK(test_case(0, {}));
  28         CHECK(test_case(1, { 0 }));
  29         CHECK(test_case(42, { 1, 3, 5 }));
  30         CHECK(test_case(0x8080FFFFU, { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 23, 31 }));
  31         CHECK(test_case(INT32_MIN, { 31 }));
  32         CHECK(test_case(INT64_MIN, { 63 }));
  33 }