Adding hammer-tests

Execution of hammer tests from bats.
https://github.com/tstrachota/hammer-tests.git
What @ekohl said. More than that. Can you make the git clone a separate test? Then delete this line (cd + git pull). I assume you used this for testing this. And then can you do:

    pusd $TEST_DIR
    ...
    popd

To the "run the test" test?

Since we have the "pipefail" above this should work fine.