message: allow negative numbers like suggested by terry
diff: @@ -81,7 +81,7 @@ protected:
  return gko::test::generate_random_matrix<Mtx>(
  ref, num_rows, num_cols,
  std::uniform_int_distribution<>(num_cols, num_cols),
  - std::normal_distribution<>(0.0, 1.0), rand_engine);
  + std::normal_distribution<>(-1.0, 1.0), rand_engine);
  }
  void initialize_data()
  