Running unit tests...
Exception
Attempting to run unit tests on a libphutil library which has not been loaded, at:

    /home/joshua/workspace/github.com/phacility/libphutil/support/phutiltestlib

This probably means one of two things:

    - You may need to add this library to .arcconfig.
    - You may be running tests on a copy of libphutil or arcanist
      using a different copy of libphutil or arcanist. This
      operation is not supported.
(Run with --trace for a full exception trace.)
Exception
Unable to read results from background linting and unit testing. You can try running arc diff again with --background 0
(Run with --trace for a full exception trace.)