code: def test_tabular_hook():
      access_token = "eyJ0eXAiOiJKV1QiLCJhbGciOiJSU"
      with requests_mock.Mocker() as m:
          m.post(
              "https://api.tabulardata.io/ws/v1/oauth/tokens",
              json={
                  "access_token": access_token,
                  "token_type": "Bearer",
                  "expires_in": 86400,
                  "warehouse_id": "fadc4c31-e81f-48cd-9ce8-64cd5ce3fa5d",
                  "region": "us-west-2",
                  "catalog_url": "warehouses/fadc4c31-e81f-48cd-9ce8-64cd5ce3fa5d",
              },
          )
          assert TabularHook().get_conn() == access_token
  
imports: from __future__ import annotations
  import pytest
  import requests_mock
  from airflow.providers.tabular.hooks.tabular import TabularHook
label_desc: Use image node_id 1 for calling a global function with example usage: test_tabular_hook() without return types