Fixture is not executing __call__

[Lubosz Kosnik]

oslo config Fixture is not running __call__ on cfg.CONF in other sitatuation than in load_raw_values method.
Based on this using fixture and testing oslo policy code results with exception NotInitializedError.

Must be executed probably in __init__ or setup method.

[Doug Hellmann (doug-hellmann)]

The timing for this is a little tricky. After ConfigOpts is initialized, it's not possible to add more command line options. Depending on how the fixture is going to be used, that may cause a problem with the test.

We could add a flag to the fixture's constructor telling it whether to initialize the ConfigOpts instance, but we would need to default to False for now.

[Doug Hellmann (doug-hellmann)]

It's safer to leave it up to the test code to invoke the fixture when it is ready.