* Always use testtools.TestCase, since we're relying on testtools
* Always use mock (as opposed to unittest.mock) since we're relying on
mock
* Add note about when a missing logging handler was added
* Stop %-formatting the giant usage string that doesn't actually need
any formatting
* Prefer assertIs, assertIn, assertIsInstance over assertTrue
* Use else-self.fail instead of sentinel values
* Check resp.get('error') is None before checking resp['success'] is
True, so test failures actually tell you something useful
* Tighten some isinstance assertions
* Import MockHttpTest from correct location
* Only populate clean_os_environ once
* Use setUp for setup, not __init__
* Replace assertIn(key, dict) and assertEqual(foo, dict[key]) with
assertEqual(foo, dict.get(key)) when key is a literal and foo is not
None
* Use mock.patch.object instead of manually patching for tests
* Use six.binary_type instead of type(''.encode('utf-8'))
* Stop shadowing builtin bytes
* Reclaim some margin
* Stop checking the return-type of encode_utf8; we already know it's
bytes
Change-Id: I2138ea553378ce88810b7353147c8645a8f8c90e
9fed7ed5e1