code: def test_assign(self):
      vc = objax.VarCollection({"a": objax.TrainVar(jn.zeros(1))})
      vc["b"] = objax.TrainVar(jn.ones(1))
      self.assertEqual(len(vc), 2)
      self.assertEqual(vc["a"].value.sum(), 0)
      self.assertEqual(vc["b"].value.sum(), 1)
  
file_path: objax/tests/var_collection.py
imports: import re
  import unittest
  import jax.numpy
  import objax
  from objax.zoo import wide_resnet
label_desc: Use image node_id 5 for calling the TestVarCollection obj's underlying member method code with example usage: obj.test_assign() without return types