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Ceilometer Style Commandments

- Step 1: Read the OpenStack Style Commandments
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- Step 2: Read on

Ceilometer Specific Commandments

- [C301] LOG.warn() is not allowed. Use LOG.warning()
- [C302] Deprecated library function os.popen()

Creating Unit Tests
For every new feature, unit tests should be created that both test and
(implicitly) document the usage of said feature. If submitting a patch for a
bug that had no unit test, a new passing unit test should be added. If a
submitted bug fix does have a unit test, be sure to add a new one that fails
without the patch and passes with the patch.

All unittest classes must ultimately inherit from testtools.TestCase.

All setUp and tearDown methods must upcall using the super() method.
tearDown methods should be avoided and addCleanup calls should be preferred.
Never manually create tempfiles. Always use the tempfile fixtures from
the fixture library to ensure that they are cleaned up.