src/tint/utils/bytes/buffer_writer_test.cc

// Copyright 2024 The Dawn & Tint Authors
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#include "src/tint/utils/bytes/buffer_writer.h"

#include "gmock/gmock.h"
#include "src/tint/utils/containers/transform.h"

namespace tint::bytes {
namespace {

template <typename T, typename U, size_t N>
Vector<T, N> Cast(const Vector<U, N>& in) {
    return Transform(in, [](auto el) { return static_cast<T>(el); });
}

TEST(BufferWriterTest, IntegerBigEndian) {
    BufferWriter<16> writer;
    EXPECT_EQ(writer.Int(0x10203040u, Endianness::kBig), Success);
    EXPECT_THAT(Cast<int>(writer.buffer), testing::ElementsAre(0x10, 0x20, 0x30, 0x40));
}

TEST(BufferWriterTest, IntegerLittleEndian) {
    BufferWriter<16> writer;
    EXPECT_EQ(writer.Int(0x10203040u, Endianness::kLittle), Success);
    EXPECT_THAT(Cast<int>(writer.buffer), testing::ElementsAre(0x40, 0x30, 0x20, 0x10));
}

TEST(BufferWriterTest, Float) {
    BufferWriter<16> writer;
    EXPECT_EQ(writer.Float<float>(8.5f), Success);
    EXPECT_THAT(Cast<int>(writer.buffer), testing::ElementsAre(0x00, 0x00, 0x08, 0x41));
}

TEST(BufferWriterTest, Bool) {
    BufferWriter<16> writer;
    EXPECT_EQ(writer.Bool(true), Success);
    EXPECT_THAT(Cast<int>(writer.buffer), testing::ElementsAre(0x01));
}

}  // namespace
}  // namespace tint::bytes