problem with run tests

hello,

I am working in a Debian.

I do:

sudo apt-get update

sudo apt-get install python-pip python-numpy python-scipy libgdal-dev libatlas-base-dev gfortran ibfreetype6-dev

pip install landsat-util

And then:

pip install -r requirements-dev.txt
python setup.py test

But when a run

python tests/test_search.py

I have a message that say: "No module named landsat.search"