code: def test_fit_id_niter(self, estimator, X):
      estimator.fit(X)
  
      self.assertEqual(estimator.n_iter_, 2)
  
imports: import geomstats.backend
  from geomstats.learning.aac import AAC
  from geomstats.test.parametrizers import Parametrizer
  from geomstats.test.test_case import TestCase
  from .data.aac import AACFrechetMeanTestData, AACGGPCATestData, AACRegressionTestData, AACTestData
label_desc: Use image node_id 2 for calling the TestAACFrechetMean obj's underlying member method code with example usage: obj.test_fit_id_niter(estimator, X) without return types