code: def test_io_fetch_fetcher_datanames():
      available_data = FetchFlow.get_fetcher_datanames()
      dataset_names = [
          "bundle_atlas_hcp842",
          "bundle_fa_hcp",
          "bundles_2_subjects",
          "cenir_multib",
          "cfin_multib",
          "file_formats",
          "fury_surface",
          "gold_standard_io",
          "isbi2013_2shell",
          "ivim",
          "mni_template",
          "qtdMRI_test_retest_2subjects",
          "scil_b0",
          "sherbrooke_3shell",
          "stanford_hardi",
          "stanford_labels",
          "stanford_pve_maps",
          "stanford_t1",
          "syn_data",
          "taiwan_ntu_dsi",
          "target_tractogram_hcp",
          "tissue_data",
          "qte_lte_pte",
          "resdnn_weights",
          "DiB_217_lte_pte_ste",
          "DiB_70_lte_pte_ste",
          "synb0_weights",
          "synb0_test",
          "bundle_warp_dataset",
          "evac_weights",
          "evac_test",
          "ptt_minimal_dataset",
          "stanford_tracks",
          "cti_rat1",
      ]
  
      num_expected_fetch_methods = len(dataset_names)
      npt.assert_equal(len(available_data), num_expected_fetch_methods)
      npt.assert_equal(
          all(
              dataset_name in available_data.keys()
              for dataset_name in dataset_names
          ),
          True,
      )
  
file_path: dipy/dipy/workflows/tests/test_io.py
imports: import logging
  import os
  from tempfile import mkstemp, TemporaryDirectory
  import numpy
  import numpy.testing
  from dipy.data import get_fnames
  from dipy.data.fetcher import dipy_home
  from dipy.io.image import load_nifti, save_nifti
  from dipy.io.streamline import load_tractogram
  from dipy.testing import assert_true
  from dipy.reconst.shm import convert_sh_descoteaux_tournier
  from dipy.workflows.io import IoInfoFlow, FetchFlow, SplitFlow, ConcatenateTractogramFlow, ConvertSHFlow, ConvertTractogramFlow
label_desc: Use image node_id 3 for calling a global function with example usage: test_io_fetch_fetcher_datanames() without return types