code: def test_register_vector(
      mock_get_db_hook, mock_register_vector, pg_vector_ingest_operator
  ):
      # Create a mock database connection
      mock_db_hook = Mock()
      mock_get_db_hook.return_value = mock_db_hook
  
      pg_vector_ingest_operator._register_vector()
      mock_register_vector.assert_called_with(mock_db_hook.get_conn())
  
imports: from __future__ import annotations
  from unittest.mock import Mock, patch
  import pytest
  from airflow.providers.pgvector.operators.pgvector import PgVectorIngestOperator
label_desc: Use image node_id 2 for calling a global function with example usage: test_register_vector(mock_get_db_hook, mock_register_vector, pg_vector_ingest_operator) without return types