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