  void expectUnchanged(size_t index) {
    EXPECT_CALL(*this, onHostStatus(_, HealthTransition::Unchanged));
    EXPECT_CALL(*test_sessions_[index]->timeout_timer_, disableTimer());
    EXPECT_CALL(*test_sessions_[index]->interval_timer_, enableTimer(_, _));
  }
  void expectUnchanged(size_t index) {
    EXPECT_CALL(*this, onHostStatus(_, HealthTransition::Unchanged));
    EXPECT_CALL(*test_sessions_[index]->timeout_timer_, disableTimer());
    EXPECT_CALL(*test_sessions_[index]->interval_timer_, enableTimer(_, _));
  }