code: def dim_test_data(self):
      smoke_data = [dict(expected=3)]
      return self.generate_tests(smoke_data)
  
file_path: geomstats/tests/tests_geomstats/test_geometry/data/heisenberg.py
imports: import geomstats.backend
  from geomstats.test.data import TestData
  from .base import VectorSpaceTestData
  from .lie_group import LieGroupTestData
label_desc: Use image node_id 1 for calling the HeisenbergVectors3TestData obj's underlying member method code with example usage: obj.dim_test_data() and returns: self