Any recommendations on testing strats for

BuiltinGoal

? https://www.pantsbuild.org/docs/rules-api-testing#approach-2-run_rule_with_mocks-unit-tests-for-rules has 4 recommendations, and the one that seems to apply is unfortunately the slowest (approach 4). Alternatively, I could pass a bunch of mocks into

def run(
        self,
        build_config: BuildConfiguration,
        graph_session: GraphSession,
        options: Options,
        specs: Specs,
        union_membership: UnionMembership,
    ) -> ExitCode:

but that almost feels like I'd be bypassing anything resembling reality for this kind completions test, as the input is pretty critical here