auth.cloud-client.snippets_test: test_explicit_compute_engine failed

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---

commit: d6ef341
buildURL: Build Status, Sponge
status: failed

Test output

Traceback (most recent call last):
  File "/workspace/auth/cloud-client/snippets_test.py", line 43, in test_explicit_compute_engine
    snippets.explicit_compute_engine(project)
  File "/workspace/auth/cloud-client/snippets.py", line 53, in explicit_compute_engine
    from google.cloud import storage
  File "/workspace/auth/cloud-client/.nox/py-3-6/lib/python3.6/site-packages/google/cloud/storage/__init__.py", line 35, in 
    from google.cloud.storage.batch import Batch
  File "/workspace/auth/cloud-client/.nox/py-3-6/lib/python3.6/site-packages/google/cloud/storage/batch.py", line 27, in 
    import six
ModuleNotFoundError: No module named 'six'