code: def test_default_config(self):
      # unset environment variables if they were defined
      os.environ.pop("PYFFTW_NUM_THREADS", None)
      os.environ.pop("OMP_NUM_THREADS", None)
      os.environ.pop("PYFFTW_PLANNER_EFFORT", None)
      # defaults to single-threaded and FFTW_ESTIMATE
      config._reload_config()
      assert_equal(config.NUM_THREADS, 1)
      assert_equal(config.PLANNER_EFFORT, "FFTW_ESTIMATE")
  
file_path: py-fftw/tests/test_pyfftw_config.py
imports: from pyfftw import config, _threading_type
  from .test_pyfftw_base import run_test_suites
  import unittest
  import os
  from numpy.testing import assert_equal
label_desc: Use image node_id 3 for calling the ConfigTest obj's underlying member method code with example usage: obj.test_default_config() without return types