Code review comment for lp:~vila/charms/precise/tarmac/cleanup-tests

The attempt to merge lp:~vila/charms/precise/tarmac/cleanup-tests into lp:~canonical-ci-engineering/charms/precise/tarmac/trunk failed. Below is the output from the failed tests.

PYTHONPATH=:hooks python -m unittest discover -s unit_tests

E
======================================================================
ERROR: test_hooks (unittest.loader.ModuleImportFailure)
----------------------------------------------------------------------
ImportError: Failed to import test module: test_hooks
Traceback (most recent call last):
  File "/usr/lib/python2.7/unittest/loader.py", line 254, in _find_tests
    module = self._get_module_from_name(name)
  File "/usr/lib/python2.7/unittest/loader.py", line 232, in _get_module_from_name
    __import__(name)
  File "/tmp/tarmac/branch.ZGJ4RA/unit_tests/test_hooks.py", line 7, in <module>
    import mock
ImportError: No module named mock

----------------------------------------------------------------------
Ran 1 test in 0.001s

FAILED (errors=1)
make: *** [check] Error 1