code: def test(self):
      tf_var = tf.Variable(2.0)
      value = np.square(tf_var)
      self.assertIsInstance(value, np.ndarray)
      self.assertAllClose(4.0, value)
      with tf.control_dependencies([tf_var.assign_add(value)]):
          tf_var_value = tf_var.read_value()
      self.assertAllClose(6.0, tf_var_value)
  
imports: import numpy
  import tensorflow.compat.v2
  from tensorflow.python.framework import ops
  from tensorflow.python.framework import test_util
  from tensorflow.python.ops.numpy_ops import np_math_ops
label_desc: Use image node_id 1 for calling the VariableTest obj's underlying member method code with example usage: obj.test() without return types