Function TEST

tests/cpp/common/test_io.cc:15–22

namespace xgboost::common {
TEST(MemoryFixSizeBuffer, Seek) {
  size_t constexpr kSize{64};
  std::vector<int32_t> memory(kSize);
  MemoryFixSizeBuffer buf(memory.data(), memory.size());
  buf.Seek(MemoryFixSizeBuffer::kSeekEnd);
  size_t end = buf.Tell();
  ASSERT_EQ(end, kSize);
}

TEST(IO, FileExtension) {
  std::string filename{u8"model.json"};