code: def belongs_test_data(self):
      data = [
          dict(
              point=group_useful_matrix(gs.pi / 3, elem_33=1.0),
              expected=True,
          ),
          dict(
              point=group_useful_matrix(gs.pi / 3, elem_33=0.0),
              expected=False,
          ),
          dict(
              point=gs.stack(
                  [
                      group_useful_matrix(gs.pi / 3, elem_33=1.0),
                      group_useful_matrix(gs.pi / 3, elem_33=0.0),
                  ]
              ),
              expected=[True, False],
          ),
      ]
      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 1 for calling the SpecialEuclideanMatrices2TestData obj's underlying member method code with example usage: obj.belongs_test_data() and returns: self