code: def compose_test_data(self):
      data = [
          dict(
              point_a=elements_all["translation_small"],
              point_b=elements_all["translation_large"],
              expected=elements_all["translation_small"]
              + elements_all["translation_large"],
          )
      ]
      return self.generate_tests(data)
  
imports: import geomstats.backend
  from geomstats.test.data import TestData
  from .base import LevelSetTestData
  from .invariant_metric import InvariantMetricMatrixTestData
  from .lie_group import LieGroupTestData, MatrixLieGroupTestData
  from .mixins import ProjectionMixinsTestData
label_desc: Use image node_id 2 for calling the SpecialEuclidean2VectorsTestData obj's underlying member method code with example usage: obj.compose_test_data() and returns: self