code: def test_upper_triangular_matrix_from_vector(
      self, point, expected, atol
  ):
      res = self.space.upper_triangular_matrix_from_vector(point)
      self.assertAllClose(res, expected, atol=atol)
  
file_path: geomstats/geomstats/test_cases/geometry/heisenberg.py
imports: import pytest
  from geomstats.test.random import HeisenbergVectorsRandomDataGenerator
  from geomstats.test.vectorization import generate_vectorization_data
  from geomstats.test_cases.geometry.base import VectorSpaceTestCase
  from geomstats.test_cases.geometry.lie_group import LieGroupTestCase
label_desc: Use image node_id 2 for calling the HeisenbergVectorsTestCase obj's underlying member method code with example usage: obj.test_upper_triangular_matrix_from_vector(point, expected, atol) without return types