code: def identity_test_data(self):
      data = [
          dict(expected=gs.eye(3)),
      ]
  
      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 SpecialEuclideanMatrices2TestData obj's underlying member method code with example usage: obj.identity_test_data() and returns: self