code: def test_constructor_and_read_properties(self):
      sd = ShapeDtype((2, 3), np.int32)
      self.assertEqual(sd.shape, (2, 3))
      self.assertEqual(sd.dtype, np.int32)
  
file_path: trax/trax/shapes_test.py
imports: from absl.testing import absltest
  import numpy
  from trax import shapes
  from trax.shapes import ShapeDtype
label_desc: Use image node_id 1 for calling the ShapesTest obj's underlying member method code with example usage: obj.test_constructor_and_read_properties() without return types