code: def observation_jacobian_test_data(self):
      data = [
          dict(
              state=None,
              observation=None,
              expected=gs.array([[1.0, 0.0]]),
          )
      ]
      return self.generate_tests(data)
  
imports: import geomstats.backend
  from geomstats.algebra_utils import from_vector_to_diagonal_matrix
  from geomstats.test.data import TestData
label_desc: Use image node_id 4 for calling the LocalizationLinearTestData obj's underlying member method code with example usage: obj.observation_jacobian_test_data() and returns: self