code: def belongs_test_data(self):
      p_xy = gs.array(
          [[1.0, 0.0, 0.0], [0.0, 1.0, 0.0], [0.0, 0.0, 0.0]]
      )
      p_yz = gs.array(
          [[0.0, 0.0, 0.0], [0.0, 1.0, 0.0], [0.0, 0.0, 1.0]]
      )
      p_xz = gs.array(
          [[1.0, 0.0, 0.0], [0.0, 0.0, 0.0], [0.0, 0.0, 1.0]]
      )
  
      data = [
          dict(point=p_xy, expected=gs.array(True)),
          dict(
              point=gs.stack([p_yz, p_xz]),
              expected=gs.array([True, True]),
          ),
      ]
      return self.generate_tests(data)
  
file_path: geomstats/tests/tests_geomstats/test_geometry/data/grassmannian.py
imports: import geomstats.backend
  from geomstats.geometry.matrices import Matrices
  from geomstats.test.data import TestData
  from .matrices import MatricesMetricTestData
label_desc: Use image node_id 1 for calling the Grassmannian32TestData obj's underlying member method code with example usage: obj.belongs_test_data() and returns: self