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404 lines
11 KiB
C++
404 lines
11 KiB
C++
/*
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* Copyright (c) 2020, Ben Wiederhake <BenWiederhake.GitHub@gmx.de>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <LibTest/TestCase.h>
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#include <AK/Checked.h>
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#include <AK/NumericLimits.h>
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// These tests only check whether the usual operator semantics work.
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// TODO: Add tests about the actual `Check`ing itself!
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TEST_CASE(address_identity)
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{
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Checked<int> a = 4;
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Checked<int> b = 5;
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EXPECT_EQ(&a == &a, true);
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EXPECT_EQ(&a == &b, false);
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EXPECT_EQ(&a != &a, false);
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EXPECT_EQ(&a != &b, true);
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}
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TEST_CASE(operator_identity)
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{
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Checked<int> a = 4;
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EXPECT_EQ(a == 4, true);
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EXPECT_EQ(a == 5, false);
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EXPECT_EQ(a != 4, false);
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EXPECT_EQ(a != 5, true);
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}
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TEST_CASE(operator_incr)
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{
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Checked<int> a = 4;
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EXPECT_EQ(++a, 5);
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EXPECT_EQ(++a, 6);
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EXPECT_EQ(++a, 7);
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EXPECT_EQ(a++, 7);
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EXPECT_EQ(a++, 8);
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EXPECT_EQ(a++, 9);
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EXPECT_EQ(a, 10);
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}
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TEST_CASE(operator_decr)
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{
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Checked<u32> a = 5;
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EXPECT_EQ(--a, 4u);
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EXPECT_EQ(--a, 3u);
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EXPECT_EQ(a--, 3u);
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EXPECT_EQ(a--, 2u);
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EXPECT_EQ(a--, 1u);
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EXPECT_EQ(a, 0u);
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EXPECT(!a.has_overflow());
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a--;
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EXPECT(a.has_overflow());
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}
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TEST_CASE(operator_cmp)
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{
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Checked<int> a = 4;
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EXPECT_EQ(a > 3, true);
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EXPECT_EQ(a < 3, false);
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EXPECT_EQ(a >= 3, true);
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EXPECT_EQ(a <= 3, false);
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EXPECT_EQ(a > 4, false);
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EXPECT_EQ(a < 4, false);
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EXPECT_EQ(a >= 4, true);
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EXPECT_EQ(a <= 4, true);
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EXPECT_EQ(a > 5, false);
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EXPECT_EQ(a < 5, true);
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EXPECT_EQ(a >= 5, false);
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EXPECT_EQ(a <= 5, true);
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}
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TEST_CASE(operator_arith)
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{
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Checked<int> a = 12;
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Checked<int> b = 345;
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EXPECT_EQ(a + b, 357);
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EXPECT_EQ(b + a, 357);
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EXPECT_EQ(a - b, -333);
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EXPECT_EQ(b - a, 333);
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EXPECT_EQ(a * b, 4140);
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EXPECT_EQ(b * a, 4140);
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EXPECT_EQ(a / b, 0);
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EXPECT_EQ(b / a, 28);
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}
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TEST_CASE(detects_signed_overflow)
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{
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EXPECT(!(Checked<int>(0x40000000) + Checked<int>(0x3fffffff)).has_overflow());
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EXPECT((Checked<int>(0x40000000) + Checked<int>(0x40000000)).has_overflow());
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EXPECT(!(Checked<int>(-0x40000000) + Checked<int>(-0x40000000)).has_overflow());
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EXPECT((Checked<int>(-0x40000001) + Checked<int>(-0x40000000)).has_overflow());
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EXPECT(!(Checked<int>(0x40000000) - Checked<int>(-0x3fffffff)).has_overflow());
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EXPECT((Checked<int>(0x40000000) - Checked<int>(-0x40000000)).has_overflow());
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EXPECT(!(Checked<int>(-0x40000000) - Checked<int>(0x40000000)).has_overflow());
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EXPECT((Checked<int>(-0x40000000) - Checked<int>(0x40000001)).has_overflow());
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EXPECT(!(Checked<i64>(0x4000000000000000) + Checked<i64>(0x3fffffffffffffff)).has_overflow());
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EXPECT((Checked<i64>(0x4000000000000000) + Checked<i64>(0x4000000000000000)).has_overflow());
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EXPECT(!(Checked<i64>(-0x4000000000000000) + Checked<i64>(-0x4000000000000000)).has_overflow());
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EXPECT((Checked<i64>(-0x4000000000000001) + Checked<i64>(-0x4000000000000000)).has_overflow());
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EXPECT(!(Checked<i64>(0x4000000000000000) - Checked<i64>(-0x3fffffffffffffff)).has_overflow());
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EXPECT((Checked<i64>(0x4000000000000000) - Checked<i64>(-0x4000000000000000)).has_overflow());
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EXPECT(!(Checked<i64>(-0x4000000000000000) - Checked<i64>(0x4000000000000000)).has_overflow());
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EXPECT((Checked<i64>(-0x4000000000000000) - Checked<i64>(0x4000000000000001)).has_overflow());
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EXPECT((Checked<i32>(0x80000000) / Checked<i32>(-1)).has_overflow());
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EXPECT((Checked<i64>(0x8000000000000000) / Checked<i64>(-1)).has_overflow());
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}
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TEST_CASE(detects_unsigned_overflow)
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{
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EXPECT(!(Checked<u32>(0x40000000) + Checked<u32>(0x3fffffff)).has_overflow());
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EXPECT(!(Checked<u32>(0x40000000) + Checked<u32>(0x40000000)).has_overflow());
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EXPECT(!(Checked<u32>(0xf0000000) + Checked<u32>(0x0fffffff)).has_overflow());
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EXPECT((Checked<u32>(0xf0000000) + Checked<u32>(0x10000000)).has_overflow());
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EXPECT(!(Checked<u32>(0x40000000) - Checked<u32>(0x3fffffff)).has_overflow());
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EXPECT(!(Checked<u32>(0x40000000) - Checked<u32>(0x40000000)).has_overflow());
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EXPECT((Checked<u32>(0x40000000) - Checked<u32>(0x40000001)).has_overflow());
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EXPECT(!(Checked<u64>(0x4000000000000000) + Checked<u64>(0x3fffffffffffffff)).has_overflow());
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EXPECT(!(Checked<u64>(0x4000000000000000) + Checked<u64>(0x4000000000000000)).has_overflow());
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EXPECT(!(Checked<u64>(0xf000000000000000) + Checked<u64>(0x0fffffffffffffff)).has_overflow());
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EXPECT((Checked<u64>(0xf000000000000000) + Checked<u64>(0x1000000000000000)).has_overflow());
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EXPECT(!(Checked<u64>(0x4000000000000000) - Checked<u64>(0x3fffffffffffffff)).has_overflow());
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EXPECT(!(Checked<u64>(0x4000000000000000) - Checked<u64>(0x4000000000000000)).has_overflow());
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EXPECT((Checked<u64>(0x4000000000000000) - Checked<u64>(0x4000000000000001)).has_overflow());
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}
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TEST_CASE(should_constexpr_default_construct)
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{
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constexpr Checked<int> checked_value {};
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static_assert(!checked_value.has_overflow());
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static_assert(checked_value == int {});
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}
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TEST_CASE(should_constexpr_value_construct)
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{
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constexpr Checked<int> checked_value { 42 };
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static_assert(!checked_value.has_overflow());
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static_assert(checked_value == 42);
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}
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TEST_CASE(should_constexpr_convert_construct)
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{
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constexpr Checked<int> checked_value { 42u };
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static_assert(!checked_value.has_overflow());
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static_assert(checked_value == 42);
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}
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TEST_CASE(should_constexpr_copy_construct)
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{
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constexpr auto checked_value = [] {
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Checked<int> const old_value { 42 };
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Checked<int> value(old_value);
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return value;
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}();
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static_assert(!checked_value.has_overflow());
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static_assert(checked_value == 42);
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}
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TEST_CASE(should_constexpr_move_construct)
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{
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constexpr auto checked_value = [] {
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Checked<int> value(Checked<int> { 42 });
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return value;
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}();
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static_assert(!checked_value.has_overflow());
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static_assert(checked_value == 42);
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}
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TEST_CASE(should_constexpr_copy_assign)
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{
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constexpr auto checked_value = [] {
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Checked<int> const old_value { 42 };
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Checked<int> value {};
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value = old_value;
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return value;
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}();
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static_assert(!checked_value.has_overflow());
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static_assert(checked_value == 42);
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}
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TEST_CASE(should_constexpr_move_assign)
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{
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constexpr auto checked_value = [] {
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Checked<int> value {};
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value = Checked<int> { 42 };
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return value;
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}();
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static_assert(!checked_value.has_overflow());
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static_assert(checked_value == 42);
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}
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TEST_CASE(should_constexpr_convert_and_assign)
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{
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constexpr auto checked_value = [] {
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Checked<int> value {};
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value = 42;
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return value;
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}();
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static_assert(!checked_value.has_overflow());
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static_assert(checked_value == 42);
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}
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TEST_CASE(should_constexpr_not_operator)
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{
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constexpr Checked<int> value {};
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static_assert(!value);
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}
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TEST_CASE(should_constexpr_value_accessor)
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{
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constexpr Checked<int> value { 42 };
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static_assert(value.value() == 42);
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}
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TEST_CASE(should_constexpr_add)
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{
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constexpr auto checked_value = [] {
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Checked<int> value { 42 };
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value.add(3);
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return value;
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}();
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static_assert(checked_value == 45);
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}
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TEST_CASE(should_constexpr_sub)
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{
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constexpr auto checked_value = [] {
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Checked<int> value { 42 };
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value.sub(3);
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return value;
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}();
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static_assert(checked_value == 39);
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}
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TEST_CASE(should_constexpr_mul)
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{
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constexpr auto checked_value = [] {
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Checked<int> value { 42 };
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value.mul(2);
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return value;
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}();
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static_assert(checked_value == 84);
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}
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TEST_CASE(should_constexpr_div)
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{
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constexpr auto checked_value = [] {
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Checked<int> value { 42 };
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value.div(3);
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return value;
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}();
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static_assert(checked_value == 14);
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}
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TEST_CASE(should_constexpr_assignment_by_sum)
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{
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constexpr auto checked_value = [] {
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Checked<int> value { 42 };
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value += 3;
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return value;
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}();
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static_assert(checked_value == 45);
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}
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TEST_CASE(should_constexpr_assignment_by_diff)
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{
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constexpr auto checked_value = [] {
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Checked<int> value { 42 };
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value -= 3;
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return value;
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}();
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static_assert(checked_value == 39);
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}
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TEST_CASE(should_constexpr_assignment_by_product)
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{
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constexpr auto checked_value = [] {
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Checked<int> value { 42 };
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value *= 2;
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return value;
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}();
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static_assert(checked_value == 84);
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}
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TEST_CASE(should_constexpr_assignment_by_quotient)
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{
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constexpr auto checked_value = [] {
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Checked<int> value { 42 };
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value /= 3;
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return value;
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}();
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static_assert(checked_value == 14);
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}
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TEST_CASE(should_constexpr_prefix_increment)
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{
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constexpr auto checked_value = [] {
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Checked<int> value { 42 };
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++value;
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return value;
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}();
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static_assert(checked_value == 43);
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}
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TEST_CASE(should_constexpr_postfix_increment)
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{
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constexpr auto checked_value = [] {
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Checked<int> value { 42 };
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value++;
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return value;
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}();
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static_assert(checked_value == 43);
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}
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TEST_CASE(should_constexpr_check_for_overflow_addition)
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{
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static_assert(Checked<int>::addition_would_overflow(NumericLimits<int>::max(), 1));
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}
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TEST_CASE(should_constexpr_check_for_overflow_multiplication)
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{
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static_assert(Checked<int>::multiplication_would_overflow(NumericLimits<int>::max(), 2));
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static_assert(Checked<int>::multiplication_would_overflow(NumericLimits<int>::max(), 1, 2));
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}
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TEST_CASE(should_constexpr_add_checked_values)
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{
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constexpr Checked<int> a { 42 };
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constexpr Checked<int> b { 17 };
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constexpr Checked<int> expected { 59 };
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static_assert(expected == (a + b).value());
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}
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TEST_CASE(should_constexpr_subtract_checked_values)
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{
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constexpr Checked<int> a { 42 };
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constexpr Checked<int> b { 17 };
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constexpr Checked<int> expected { 25 };
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static_assert(expected == (a - b).value());
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}
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TEST_CASE(should_constexpr_multiply_checked_values)
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{
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constexpr Checked<int> a { 3 };
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constexpr Checked<int> b { 5 };
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constexpr Checked<int> expected { 15 };
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static_assert(expected == (a * b).value());
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}
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TEST_CASE(should_constexpr_divide_checked_values)
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{
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constexpr Checked<int> a { 10 };
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constexpr Checked<int> b { 2 };
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constexpr Checked<int> expected { 5 };
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static_assert(expected == (a / b).value());
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}
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TEST_CASE(should_constexpr_compare_checked_values_lhs)
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{
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constexpr Checked<int> a { 10 };
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static_assert(a > 5);
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static_assert(a >= 10);
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static_assert(a >= 5);
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static_assert(a < 20);
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static_assert(a <= 30);
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static_assert(a <= 20);
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static_assert(a == 10);
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static_assert(a != 20);
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}
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TEST_CASE(should_constexpr_compare_checked_values_rhs)
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{
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constexpr Checked<int> a { 10 };
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static_assert(5 < a);
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static_assert(10 <= a);
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static_assert(5 <= a);
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static_assert(20 > a);
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static_assert(30 >= a);
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static_assert(30 >= a);
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static_assert(10 == a);
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static_assert(20 != a);
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}
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TEST_CASE(should_constexpr_make_via_factory)
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{
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[[maybe_unused]] constexpr auto value = make_checked(42);
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}
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