Method provider

tests/lib/test_credentials.py:1647–1651

(*, force_refresh: bool = False)

        release_refresh = _threading.Event()

        def provider(*, force_refresh: bool = False) -> AccessToken:  # noqa: ARG001
            provider_calls.append(1)
            refresh_started.set()
            release_refresh.wait(timeout=2)
            return tokens[len(provider_calls) - 1]

        cache = TokenCache(provider, time_source=clock)
        # Prime the cache with token 'a'.