code: def test_fit(self, X, expected, atol):
      estimate = self.estimator.fit(X).estimate_
      self.assertAllClose(estimate, expected, atol=atol)
  
imports: from geomstats.test_cases.learning._base import BaseEstimatorTestCase, MeanEstimatorMixinsTestCase
label_desc: Use image node_id 1 for calling the IncrementalFrechetMeanTestCase obj's underlying member method code with example usage: obj.test_fit(X, expected, atol) without return types