Only if you want four tests to fail with:
```
Traceback (most recent call last):
  File "/Users/jerith/.virtualenvs/vumi-go/lib/python2.7/site-packages/twisted/internet/defer.py", line 1070, in _inlineCallbacks
    result = g.send(result)
  File "/Users/jerith/code/vumi-go/go/vumitools/tests/test_metrics_worker.py", line 249, in test_metrics_loop_func_bucket_nonzero
    3: [conv3],
  File "/Users/jerith/code/vumi-go/go/vumitools/tests/test_metrics_worker.py", line 67, in assert_conversations_bucketed
    expected = copy.deepcopy(expected)
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/copy.py", line 163, in deepcopy
    y = copier(x, memo)
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/copy.py", line 257, in _deepcopy_dict
    y[deepcopy(key, memo)] = deepcopy(value, memo)

  ...

  File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/copy.py", line 163, in deepcopy
    y = copier(x, memo)
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/copy.py", line 257, in _deepcopy_dict
    y[deepcopy(key, memo)] = deepcopy(value, memo)
  File "/Users/jerith/.virtualenvs/vumi-go/lib/python2.7/site-packages/_pytest/main.py", line 273, in __hash__
    return hash((self.name, self.parent))
AttributeError: 'UnitTestCase' object has no attribute 'name'
```