code: def propagate_test_data(self):
      time_step = gs.array([0.5])
      linear_vel = gs.array([1.0, 0.5])
      angular_vel = gs.array([0.0])
  
      initial_state = gs.array([0.5, 1.0, 2.0])
      angle = initial_state[0]
      rotation = gs.array(
          [
              [gs.cos(angle), -gs.sin(angle)],
              [gs.sin(angle), gs.cos(angle)],
          ]
      )
  
      next_position = initial_state[1:] + time_step * gs.matvec(
          rotation, linear_vel
      )
      expected = gs.concatenate(
          (gs.array([angle]), next_position), axis=0
      )
  
      data = [
          dict(
              state=initial_state,
              sensor_input=gs.concatenate(
                  (time_step, linear_vel, angular_vel), axis=0
              ),
              expected=expected,
          )
      ]
  
      return self.generate_tests(data)
  
imports: import geomstats.backend
  from geomstats.algebra_utils import from_vector_to_diagonal_matrix
  from geomstats.test.data import TestData
label_desc: Use image node_id 1 for calling the LocalizationTestData obj's underlying member method code with example usage: obj.propagate_test_data() and returns: self