code: def test_init(self):
      md = ImageModality()
      md.build(id_map=None)
  
      self.assertIsNone(md.images)
      self.assertIsNone(md.paths)
  
imports: import unittest
  from cornac.data import ImageModality
label_desc: Use image node_id 1 for calling the TestImageModality obj's underlying member method code with example usage: obj.test_init() without return types