cinder/HACKING.rst

Cinder Style Commandments

• Step 1: Read the OpenStack Style Commandments https://docs.openstack.org/hacking/latest/
• Step 2: Read on

Cinder Specific Commandments

• [N322] Ensure default arguments are not mutable.
• [N323] Add check for explicit import of _() to ensure proper translation.
• [C301] timeutils.utcnow() from oslo_utils should be used instead of datetime.now().
• [C303] Ensure that there are no 'print()' statements are used in code that should be using LOG calls.
• [C306] timeutils.strtime() must not be used (deprecated).
• [C308] timeutils.isotime() must not be used (deprecated).
• [C309] Unit tests should not perform logging.
• [C310] Check for improper use of logging format arguments.
• [C311] Check for proper naming and usage in option registration.
• [C312] Validate that logs are not translated.
• [C313] Check that assertTrue(value) is used and not assertEqual(True, value).
• [C336] Must use a dict comprehension instead of a dict constructor with a sequence of key-value pairs.
• [C337] Ensure the standard library mock modules is used and not the third party mock library that was needed for Python 2 support.

General

• Use 'raise' instead of 'raise e' to preserve original traceback or exception being reraised:

  except Exception as e:
      ...
      raise e  # BAD
  
  except Exception:
      ...
      raise  # OKAY

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.

For more information on creating unit tests and utilizing the testing infrastructure in OpenStack Cinder, please see https://docs.openstack.org/cinder/latest/contributor/testing.html