code: def test_config(self):
      m_obj = metrics.MeanIoU(num_classes=2, name="mean_iou")
      self.assertEqual(m_obj.name, "mean_iou")
      self.assertEqual(m_obj.num_classes, 2)
  
      m_obj2 = metrics.MeanIoU.from_config(m_obj.get_config())
      self.assertEqual(m_obj2.name, "mean_iou")
      self.assertEqual(m_obj2.num_classes, 2)
  
imports: import numpy
  import pytest
  from keras import layers
  from keras import models
  from keras import testing
  from keras.metrics import iou_metrics
label_desc: Use image node_id 1 for calling the MeanIoUTest obj's underlying member method code with example usage: obj.test_config() without return types