flag@harukaze:~/canonical/snapcraft$ ./runtests.sh unit
Traceback (most recent call last):
  File "/usr/lib/python3.5/runpy.py", line 184, in _run_module_as_main
    "__main__", mod_spec)
  File "/usr/lib/python3.5/runpy.py", line 85, in _run_code
    exec(code, run_globals)
  File "/usr/lib/python3.5/unittest/__main__.py", line 18, in <module>
    main(module=None)
  File "/usr/lib/python3.5/unittest/main.py", line 93, in __init__
    self.parseArgs(argv)
  File "/usr/lib/python3.5/unittest/main.py", line 117, in parseArgs
    self._do_discovery(argv[2:])
  File "/usr/lib/python3.5/unittest/main.py", line 228, in _do_discovery
    self.test = loader.discover(self.start, self.pattern, self.top)
  File "/usr/lib/python3.5/unittest/loader.py", line 338, in discover
    raise ImportError('Start directory is not importable: %r' % start_dir)
ImportError: Start directory is not importable: 'unit'