code: def test_ica_n_iter_(method, tmp_path):
      """Test that ICA.n_iter_ is set after fitting."""
      _skip_check_picard(method)
  
      raw = read_raw_fif(raw_fname).crop(0.5, stop).load_data()
      n_components = 3
      max_iter = 1
      ica = ICA(
          n_components=n_components,
          max_iter=max_iter,
          method=method,
          random_state=0,
      )
  
      if method == "infomax":
          ica.fit(raw)
      else:
          with pytest.warns(UserWarning, match="did not converge"):
              ica.fit(raw)
      assert ica.method == method
  
      assert_equal(ica.n_iter_, max_iter)
  
      # Test I/O roundtrip.
      output_fname = tmp_path / "test_ica-ica.fif"
      _assert_ica_attributes(ica, raw.get_data("data"), limits=(5, 110))
      ica.save(output_fname)
      ica = read_ica(output_fname)
      assert ica.method == method
      _assert_ica_attributes(ica)
  
      assert_equal(ica.n_iter_, max_iter)
  
imports: import os
  import shutil
  from contextlib import nullcontext
  from pathlib import Path
  import matplotlib.pyplot
  import numpy
  import pytest
  from numpy.testing import assert_allclose, assert_array_almost_equal, assert_array_equal, assert_equal
  from scipy import linalg, stats
  from scipy.io import loadmat, savemat
  from mne import Annotations, Epochs, EpochsArray, EvokedArray, Info, create_info, make_ad_hoc_cov, pick_channels_regexp, pick_types, read_events
  from mne._fiff.pick import _DATA_CH_TYPES_SPLIT, get_channel_type_constants
  from mne.cov import read_cov
  from mne.datasets import testing
  from mne.event import make_fixed_length_events
  from mne.io import RawArray, read_raw_ctf, read_raw_eeglab, read_raw_fif
  from mne.io.eeglab.eeglab import _check_load_mat
  from mne.preprocessing import ICA
  from mne.preprocessing import ica_find_ecg_events, ica_find_eog_events, read_ica
  from mne.preprocessing.ica import _ica_explained_variance, _sort_components, corrmap, get_score_funcs, read_ica_eeglab
  from mne.rank import _compute_rank_int
  from mne.utils import _record_warnings, catch_logging, check_version
label_desc: Use image node_id 8 for calling a global function with example usage: test_ica_n_iter_(method, tmp_path) without return types