code: def test_task_with_nonexistent_pool(self):
      ti = Mock(pool="nonexistent_pool", pool_slots=1)
      assert not PoolSlotsAvailableDep().is_met(ti=ti)
  
file_path: airflow/tests/ti_deps/deps/test_pool_slots_available_dep.py
imports: from __future__ import annotations
  from unittest.mock import Mock, patch
  import pytest
  from airflow.models import Pool
  from airflow.ti_deps.dependencies_states import EXECUTION_STATES
  from airflow.ti_deps.deps.pool_slots_available_dep import PoolSlotsAvailableDep
  from airflow.utils.session import create_session
  from airflow.utils.state import TaskInstanceState
  from tests.test_utils import db
label_desc: Use image node_id 7 for calling the TestPoolSlotsAvailableDep obj's underlying member method code with example usage: obj.test_task_with_nonexistent_pool() without return types