91 lines
2.8 KiB
C++
91 lines
2.8 KiB
C++
#include <gtest/gtest.h>
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#include "blobstore/implementations/onblocks/utils/Math.h"
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#include <limits>
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using namespace blobstore::onblocks::utils;
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using ::testing::Test;
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using std::numeric_limits;
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class MaxZeroSubtractionTest: public Test {};
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TEST_F(MaxZeroSubtractionTest, SubtractToZero1) {
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EXPECT_EQ(0, maxZeroSubtraction(0, 0));
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}
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TEST_F(MaxZeroSubtractionTest, SubtractToZero2) {
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EXPECT_EQ(0, maxZeroSubtraction(5, 5));
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}
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TEST_F(MaxZeroSubtractionTest, SubtractToZero3) {
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EXPECT_EQ(0, maxZeroSubtraction(184930, 184930));
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}
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TEST_F(MaxZeroSubtractionTest, SubtractToZero4) {
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EXPECT_EQ(0u, maxZeroSubtraction(numeric_limits<uint32_t>::max()-1, numeric_limits<uint32_t>::max()-1));
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}
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TEST_F(MaxZeroSubtractionTest, SubtractToZero5) {
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EXPECT_EQ(0u, maxZeroSubtraction(numeric_limits<uint32_t>::max(), numeric_limits<uint32_t>::max()));
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}
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TEST_F(MaxZeroSubtractionTest, SubtractPositive1) {
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EXPECT_EQ(1, maxZeroSubtraction(5, 4));
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}
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TEST_F(MaxZeroSubtractionTest, SubtractPositive2) {
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EXPECT_EQ(181081, maxZeroSubtraction(184930, 3849));
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}
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TEST_F(MaxZeroSubtractionTest, SubtractPositive3) {
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EXPECT_EQ(numeric_limits<uint32_t>::max()-1, maxZeroSubtraction(numeric_limits<uint32_t>::max(), UINT32_C(1)));
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}
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TEST_F(MaxZeroSubtractionTest, SubtractPositive4) {
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EXPECT_EQ(5u, maxZeroSubtraction(numeric_limits<uint32_t>::max(), numeric_limits<uint32_t>::max()-5));
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}
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TEST_F(MaxZeroSubtractionTest, SubtractNegative1) {
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EXPECT_EQ(0, maxZeroSubtraction(4, 5));
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}
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TEST_F(MaxZeroSubtractionTest, SubtractNegative2) {
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EXPECT_EQ(0, maxZeroSubtraction(3849, 184930));
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}
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TEST_F(MaxZeroSubtractionTest, SubtractNegative3) {
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EXPECT_EQ(0u, maxZeroSubtraction(numeric_limits<uint32_t>::max()-1, numeric_limits<uint32_t>::max()));
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}
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TEST_F(MaxZeroSubtractionTest, SubtractNegative4) {
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EXPECT_EQ(0u, maxZeroSubtraction(numeric_limits<uint32_t>::max()-5, numeric_limits<uint32_t>::max()));
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}
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TEST_F(MaxZeroSubtractionTest, SubtractNegative5) {
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EXPECT_EQ(0u, maxZeroSubtraction(UINT32_C(5), numeric_limits<uint32_t>::max()));
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}
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TEST_F(MaxZeroSubtractionTest, SubtractFromZero1) {
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EXPECT_EQ(0, maxZeroSubtraction(0, 1));
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}
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TEST_F(MaxZeroSubtractionTest, SubtractFromZero2) {
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EXPECT_EQ(0, maxZeroSubtraction(0, 184930));
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}
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TEST_F(MaxZeroSubtractionTest, SubtractFromZero3) {
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EXPECT_EQ(0u, maxZeroSubtraction(UINT32_C(0), numeric_limits<uint32_t>::max()));
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}
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TEST_F(MaxZeroSubtractionTest, 64bit_valid) {
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uint64_t value = UINT64_C(1024)*1024*1024*1024;
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EXPECT_GT(value, std::numeric_limits<uint32_t>::max());
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EXPECT_EQ(value*1024-value, maxZeroSubtraction(value*1024, value));
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}
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TEST_F(MaxZeroSubtractionTest, 64bit_zero) {
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uint64_t value = UINT64_C(1024)*1024*1024*1024;
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EXPECT_GT(value, std::numeric_limits<uint32_t>::max());
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EXPECT_EQ(0u, maxZeroSubtraction(value, value*1024));
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}
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