code: def test_dtype(self, dtype):
      with hk.variables():
          v = tf.Variable(tf.ones([], dtype=dtype))
      self.assertEqual(dtype, v.dtype)
  
imports: from absl.testing import parameterized
  import sonnet
  from sonnet.src import test_utils
  from sonnet.src.functional import haiku
  import tensorflow
  import tree
label_desc: Use image node_id 6 for calling the TensorVariableTest obj's underlying member method code with example usage: obj.test_dtype(dtype) without return types