code: def test_value(self):
      r1 = nnx.Variable(1)
      assert r1.value == 1
  
      r2 = jax.tree_map(lambda x: x + 1, r1)
  
      assert r1.value == 1
      assert r2.value == 2
      assert r1 is not r2
  
imports: import typing
  import jax
  from flax.experimental import nnx
label_desc: Use image node_id 1 for calling the TestVariable obj's underlying member method code with example usage: obj.test_value() without return types