Improve unit testing for ALP/SparseBLAS #12
Description
Pull request #11 introduces a proof-of-concept ALP/SparseBLAS. While the functions that it wraps around are already unit-tested, it would be good to add unit tests on the ingestion into the blas_sparse_matrix and the extblas_sparse_vector containers, as well as unit tests for the functions that wrap around raw vectors and raw CRS structures.