tests: Add ScratchBuffer tests
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// SPDX-FileCopyrightText: Copyright 2022 yuzu Emulator Project
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// SPDX-License-Identifier: GPL-2.0-or-later
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#include <algorithm>
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#include <array>
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#include <span>
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#include <catch2/catch.hpp>
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#include "common/common_types.h"
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#include "common/scratch_buffer.h"
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namespace Common {
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TEST_CASE("ScratchBuffer: Basic Test", "[common]") {
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ScratchBuffer<u8> buf;
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REQUIRE(buf.size() == 0U);
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REQUIRE(buf.capacity() == 0U);
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std::array<u8, 10> payload;
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payload.fill(66);
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buf.resize(payload.size());
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REQUIRE(buf.size() == payload.size());
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REQUIRE(buf.capacity() == payload.size());
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std::memcpy(buf.data(), payload.data(), payload.size());
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for (size_t i = 0; i < payload.size(); ++i) {
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REQUIRE(buf[i] == payload[i]);
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}
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}
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TEST_CASE("ScratchBuffer: Resize Grow", "[common]") {
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std::array<u8, 10> payload;
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payload.fill(66);
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ScratchBuffer<u8> buf(payload.size());
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REQUIRE(buf.size() == payload.size());
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REQUIRE(buf.capacity() == payload.size());
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// Increasing the size should reallocate the buffer
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buf.resize(payload.size() * 2);
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REQUIRE(buf.size() == payload.size() * 2);
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REQUIRE(buf.capacity() == payload.size() * 2);
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// Since the buffer is not value initialized, reading its data will be garbage
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}
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TEST_CASE("ScratchBuffer: Resize Shrink", "[common]") {
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std::array<u8, 10> payload;
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payload.fill(66);
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ScratchBuffer<u8> buf(payload.size());
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REQUIRE(buf.size() == payload.size());
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REQUIRE(buf.capacity() == payload.size());
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std::memcpy(buf.data(), payload.data(), payload.size());
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for (size_t i = 0; i < payload.size(); ++i) {
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REQUIRE(buf[i] == payload[i]);
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}
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// Decreasing the size should not cause a buffer reallocation
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// This can be tested by ensuring the buffer capacity and data has not changed,
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buf.resize(1U);
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REQUIRE(buf.size() == 1U);
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REQUIRE(buf.capacity() == payload.size());
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for (size_t i = 0; i < payload.size(); ++i) {
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REQUIRE(buf[i] == payload[i]);
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}
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}
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TEST_CASE("ScratchBuffer: Span Size", "[common]") {
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std::array<u8, 10> payload;
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payload.fill(66);
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ScratchBuffer<u8> buf(payload.size());
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REQUIRE(buf.size() == payload.size());
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REQUIRE(buf.capacity() == payload.size());
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std::memcpy(buf.data(), payload.data(), payload.size());
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for (size_t i = 0; i < payload.size(); ++i) {
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REQUIRE(buf[i] == payload[i]);
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}
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buf.resize(3U);
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REQUIRE(buf.size() == 3U);
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REQUIRE(buf.capacity() == payload.size());
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const auto buf_span = std::span<u8>(buf);
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// The span size is the last requested size of the buffer, not its capacity
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REQUIRE(buf_span.size() == buf.size());
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for (size_t i = 0; i < buf_span.size(); ++i) {
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REQUIRE(buf_span[i] == buf[i]);
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REQUIRE(buf_span[i] == payload[i]);
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}
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}
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TEST_CASE("ScratchBuffer: Span Writes", "[common]") {
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std::array<u8, 10> payload;
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payload.fill(66);
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ScratchBuffer<u8> buf(payload.size());
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REQUIRE(buf.size() == payload.size());
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REQUIRE(buf.capacity() == payload.size());
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std::memcpy(buf.data(), payload.data(), payload.size());
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for (size_t i = 0; i < payload.size(); ++i) {
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REQUIRE(buf[i] == payload[i]);
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}
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buf.resize(3U);
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REQUIRE(buf.size() == 3U);
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REQUIRE(buf.capacity() == payload.size());
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const auto buf_span = std::span<u8>(buf);
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REQUIRE(buf_span.size() == buf.size());
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for (size_t i = 0; i < buf_span.size(); ++i) {
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const auto new_value = static_cast<u8>(i + 1U);
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// Writes to a span of the scratch buffer will propogate to the buffer itself
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buf_span[i] = new_value;
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REQUIRE(buf[i] == new_value);
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}
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}
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} // namespace Common
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