code: def test_fit_eye(self, atol):
      n = self.estimator.space.dim
  
      X = gs.eye(n)
      expected = gs.ones(n) / n
  
      self.test_fit(X, expected, atol)
  
file_path: geomstats/tests/tests_geomstats/test_learning/test_incremental_frechet_mean.py
imports: import random
  import pytest
  import geomstats.backend
  from geomstats.geometry.euclidean import Euclidean
  from geomstats.geometry.spd_matrices import SPDAffineMetric, SPDLogEuclideanMetric, SPDMatrices
  from geomstats.learning.incremental_frechet_mean import IncrementalFrechetMean
  from geomstats.test.parametrizers import DataBasedParametrizer
  from geomstats.test_cases.learning.incremental_frechet_mean import IncrementalFrechetMeanTestCase
  from .data.incremental_frechet_mean import IncrementalFrechetMeanEuclideanTestData, IncrementalFrechetMeanTestData
label_desc: Use image node_id 1 for calling the TestIncrementalFrechetMeanEuclidean obj's underlying member method code with example usage: obj.test_fit_eye(atol) without return types