45 lines
1.4 KiB
C++
45 lines
1.4 KiB
C++
/** @file clamped_arithmetic_test.cpp
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* @brief Tests for shared helpers in clamped_arithmetic.h.
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* @ingroup Tests
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*/
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#include <gtest/gtest.h>
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#include <libcockatrice/utility/clamped_arithmetic.h>
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#include <limits>
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TEST(AddClamped, AddsWithinBounds)
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{
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EXPECT_EQ(addClamped(5, 3, 0, 100), 8);
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EXPECT_EQ(addClamped(10, -3, 0, 100), 7);
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}
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TEST(AddClamped, ClampsToUpperAndLowerBound)
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{
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EXPECT_EQ(addClamped(99, 5, 0, 100), 100); // saturates at max
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EXPECT_EQ(addClamped(2, -10, 0, 100), 0); // saturates at min
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EXPECT_EQ(addClamped(999, 1, 0, 999), 999); // crossing the counter cap holds at the bound
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}
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TEST(AddClamped, IntOverflowDoesNotWrap)
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{
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// The 64-bit intermediate must prevent signed-int overflow UB.
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constexpr int intMax = std::numeric_limits<int>::max();
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constexpr int intMin = std::numeric_limits<int>::min();
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EXPECT_EQ(addClamped(intMax, 1, intMin, intMax), intMax);
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EXPECT_EQ(addClamped(intMax, intMax, intMin, intMax), intMax);
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}
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TEST(AddClamped, IntUnderflowDoesNotWrap)
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{
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constexpr int intMax = std::numeric_limits<int>::max();
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constexpr int intMin = std::numeric_limits<int>::min();
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EXPECT_EQ(addClamped(intMin, -1, intMin, intMax), intMin);
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EXPECT_EQ(addClamped(intMin, intMin, intMin, intMax), intMin);
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}
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int main(int argc, char **argv)
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{
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::testing::InitGoogleTest(&argc, argv);
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return RUN_ALL_TESTS();
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}
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