How to use the libmozevent.phabricator.PhabricatorBuildState function in libmozevent

async def start_test_selection(self, build: PhabricatorBuild, revision: str):
        """
        Run test selection by triggering a Taskcluster hook
        """
        assert build.state == PhabricatorBuildState.Public
        try:
            if not self.should_run_test_selection(build):
                return

            task = self.community_tc["hooks"].triggerHook(
                "project-relman",
                "bugbug-test-select",
                {
                    "PHABRICATOR_DEPLOYMENT": self.phabricator_deployment,
                    "DIFF_ID": build.diff_id,
                    "RUNNABLE_JOBS": self.index_service.buildUrl(
                        "findArtifactFromTask",
                        f"gecko.v2.try.revision.{revision}.firefox.decision",
                        "public/runnable-jobs.json",
                    ),
                },