arma::Mat<unsigned char> matrix;
  data::ImageInfo info;
  BOOST_REQUIRE(data::Load("test_image.png", matrix, info, false) == true);
  cout<<matrix<<endl;
  BOOST_REQUIRE_EQUAL(matrix.n_rows, 50 * 50 * 3); // width * height * channels.
  for (size_t i = 0; i < matrix.n_elem; ++i)
  {
    cout<<matrix[i]<<",";
  }