old_contents: from numba.np.ufunc.parallel import get_thread_count
  from os import environ as env
  from numba.core import config
  import unittest
  
  
  class TestParallelEnvVariable(unittest.TestCase):
      """
      Tests environment variables related to the underlying "parallel"
      functions for npyufuncs.
      """
  
      _numba_parallel_test_ = False
  
      def test_num_threads_variable(self):
          """
          Tests the NUMBA_NUM_THREADS env variable behaves as expected.
          """
          key = 'NUMBA_NUM_THREADS'
          current = str(getattr(env, key, config.NUMBA_DEFAULT_NUM_THREADS))
          threads = "3154"
          env[key] = threads
          config.reload_config()
          try:
              self.assertEqual(threads, str(get_thread_count()))
              self.assertEqual(threads, str(config.NUMBA_NUM_THREADS))
          finally:
              # reset the env variable/set to default
              env[key] = current
              config.reload_config()
  
  if __name__ == '__main__':
      unittest.main()
  
new_contents: from numba.np.ufunc.parallel import get_thread_count
  from os import environ as env
  from numba.core import config
  import unittest
  
  
  class TestParallelEnvVariable(unittest.TestCase):
      """
      Tests environment variables related to the underlying "parallel"
      functions for npyufuncs.
      """
  
      _numba_parallel_test_ = False
  
      def test_num_threads_variable(self):
          """
          Tests the NUMBA_NUM_THREADS env variable behaves as expected.
          """
          key = 'NUMBA_NUM_THREADS'
          current = str(getattr(env, key, config.NUMBA_NUM_THREADS))
          threads = "3154"
          env[key] = threads
          config.reload_config()
          try:
              self.assertEqual(threads, str(get_thread_count()))
              self.assertEqual(threads, str(config.NUMBA_NUM_THREADS))
          finally:
              # reset the env variable/set to default
              env[key] = current
              config.reload_config()
  
  if __name__ == '__main__':
      unittest.main()
  
subject: Reset the num threads to the env variable, not the default