autopep8 formatting on tests.py (--max-line-length=120)
autopep8 formatting on tests.py (--max-line-length=120)

danforthcenter/plantcv,danforthcenter/plantcv,stiphyMT/plantcv,stiphyMT/plantcv,stiphyMT/plantcv,danforthcenter/plantcv