docstr: Test max_active_tasks reached should fail dep
docstr_tok: ["Test","max_active_tasks","reached","should","fail","dep"]
code: def test_concurrency_reached(self):
      """
      Test max_active_tasks reached should fail dep
      """
      dag = Mock(
          concurrency=1, get_concurrency_reached=Mock(return_value=True)
      )
      task = Mock(dag=dag, pool_slots=1)
      ti = TaskInstance(task, execution_date=None)
  
      assert not DagTISlotsAvailableDep().is_met(ti=ti)
  
imports: from __future__ import annotations
  from unittest.mock import Mock
  import pytest
  from airflow.models import TaskInstance
  from airflow.ti_deps.deps.dag_ti_slots_available_dep import DagTISlotsAvailableDep
label_desc: Use image node_id 1 for calling the TestDagTISlotsAvailableDep obj's underlying member method code with example usage: obj.test_concurrency_reached() without return types