src/test/unit/encoding_unittest.cc

   1 /*
   2  * This file is part of Cleanflight.
   3  *
   4  * Cleanflight is free software: you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation, either version 3 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * Cleanflight is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with Cleanflight.  If not, see <http://www.gnu.org/licenses/>.
  16  */
  17 #include <stdint.h>
  18
  19 extern "C" {
  20     #include "common/encoding.h"
  21     #include "common/utils.h"
  22 }
  23
  24 #include "unittest_macros.h"
  25 #include "gtest/gtest.h"
  26
  27 typedef struct zigzagEncodingExpectation_s {
  28     int32_t input;
  29     uint32_t expected;
  30 } zigzagEncodingExpectation_t;
  31
  32 typedef struct floatToIntEncodingExpectation_s {
  33     float input;
  34     uint32_t expected;
  35 } floatToIntEncodingExpectation_t;
  36
  37 TEST(EncodingTest, ZigzagEncodingTest)
  38 {
  39     // given
  40     zigzagEncodingExpectation_t expectations[] = {
  41         { 0, 0},
  42         {-1, 1},
  43         { 1, 2},
  44         {-2, 3},
  45         { 2, 4},
  46
  47         { 2147483646, 4294967292},
  48         {-2147483647, 4294967293},
  49         { 2147483647, 4294967294},
  50         {-2147483648, 4294967295},
  51     };
  52     int expectationCount = ARRAYLEN(expectations);
  53
  54     // expect
  55
  56     for (int i = 0; i < expectationCount; i++) {
  57         zigzagEncodingExpectation_t *expectation = &expectations[i];
  58
  59         EXPECT_EQ(expectation->expected, zigzagEncode(expectation->input));
  60     }
  61 }
  62
  63 TEST(EncodingTest, FloatToIntEncodingTest)
  64 {
  65     // given
  66     floatToIntEncodingExpectation_t expectations[] = {
  67         {0.0, 0x00000000},
  68         {2.0, 0x40000000}, // Exponent should be in the top bits
  69         {4.5, 0x40900000}
  70     };
  71     int expectationCount = ARRAYLEN(expectations);
  72
  73     // expect
  74
  75     for (int i = 0; i < expectationCount; i++) {
  76         floatToIntEncodingExpectation_t *expectation = &expectations[i];
  77
  78         EXPECT_EQ(expectation->expected, castFloatBytesToInt(expectation->input));
  79     }
  80 }
  81
  82 // STUBS
  83
  84 extern "C" {
  85 }