code: def test_check_init_parameter_variables(_input_vars):
      assert _check_init_parameter_variables(_input_vars) == _input_vars
  
imports: import pytest
  from feature_engine._variable_handling.init_parameter_checks import _check_init_parameter_variables
label_desc: Use image node_id 2 for calling a global function with example usage: test_check_init_parameter_variables(_input_vars) without return types