Why:
- TemporaryPasswordPrimaryAuthenticationProviderTest currently combines
multiple test cases within a single test method, leading to
duplication and making the tests harder to grok.
What:
- Split the test cases within the test class to use either data
providers or separate methods where the inputs cannot be provided via
a data provider.
- Make getProvider() stateless and initialize the $manager and $validity
fields unconditionally via a setup hook to avoid confusing null errors
if attempting to manipulate these fields prior to obtaining a provider
instance.
Bug: T328718
Change-Id: I3e53d06ec5bde6a8f842f5caed5cdbad883f7afd
b9a7704e54