sat_counter.test.cc revision 13961:3139b24cd76d
1/* 2 * Copyright (c) 2019 Inria 3 * All rights reserved 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions are 7 * met: redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer; 9 * redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution; 12 * neither the name of the copyright holders nor the names of its 13 * contributors may be used to endorse or promote products derived from 14 * this software without specific prior written permission. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 17 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 18 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 19 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 20 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 21 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 22 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 * 28 * Authors: Daniel Carvalho 29 */ 30 31#include <gtest/gtest.h> 32 33#include "base/sat_counter.hh" 34 35/** 36 * Test if the maximum value is indeed the maximum value reachable. 37 */ 38TEST(SatCounterTest, MaximumValue) 39{ 40 const unsigned bits = 3; 41 const unsigned max_value = (1 << bits) - 1; 42 SatCounter counter(bits); 43 44 for (int i = 0; i < 2*max_value; i++) { 45 counter++; 46 } 47 48 ASSERT_EQ(counter, max_value); 49} 50 51/** 52 * Test if the minimum value is indeed the mimimum value reachable. 53 */ 54TEST(SatCounterTest, MinimumValue) 55{ 56 const unsigned bits = 3; 57 SatCounter counter(bits); 58 59 for (int i = 0; i < 2; i++) { 60 counter--; 61 } 62 63 ASSERT_EQ(counter, 0); 64} 65 66/** 67 * Test initializing the counter with a value, updating it and then resetting. 68 */ 69TEST(SatCounterTest, InitialValue) 70{ 71 const unsigned bits = 3; 72 const unsigned initial_value = 4; 73 SatCounter counter(bits, initial_value); 74 ASSERT_EQ(counter, initial_value); 75 counter++; 76 counter.reset(); 77 ASSERT_EQ(counter, initial_value); 78} 79 80/** 81 * Test back and forth against an int. 82 */ 83TEST(SatCounterTest, IntComparison) 84{ 85 const unsigned bits = 3; 86 SatCounter counter(bits); 87 int value = 0; 88 89 ASSERT_EQ(counter++, value++); 90 ASSERT_EQ(counter++, value++); 91 ASSERT_EQ(counter--, value--); 92 ASSERT_EQ(counter++, value++); 93 ASSERT_EQ(counter++, value++); 94 ASSERT_EQ(counter--, value--); 95 ASSERT_EQ(counter++, value++); 96 ASSERT_EQ(counter--, value--); 97 ASSERT_EQ(counter--, value--); 98 ASSERT_EQ(counter++, value++); 99 ASSERT_EQ(counter--, value--); 100 ASSERT_EQ(counter--, value--); 101 ASSERT_EQ(counter, 0); 102} 103 104/** 105 * Test both pre and post operators. 106 */ 107TEST(SatCounterTest, PrePostOperators) 108{ 109 const unsigned bits = 3; 110 const unsigned max_value = (1 << bits) - 1; 111 SatCounter counter_pre(bits); 112 SatCounter counter_post(bits); 113 114 for (int i = 0; i < 2*max_value; i++) { 115 counter_post++; 116 SatCounter value_pre = ++counter_pre; 117 ASSERT_EQ(counter_post, value_pre); 118 } 119 120 ASSERT_EQ(counter_pre, max_value); 121 ASSERT_EQ(counter_post, max_value); 122 123 for (int i = 0; i < 2*max_value; i++) { 124 counter_post--; 125 SatCounter value_pre = --counter_pre; 126 ASSERT_EQ(counter_post, value_pre); 127 } 128 129 ASSERT_EQ(counter_pre, 0); 130 ASSERT_EQ(counter_post, 0); 131} 132