code: def test_plot_psdtopo_nirs(fnirs_epochs):
      """Test plotting of PSD topography for nirs data."""
      bands = {"0.2 Hz": 0.2, "0.4 Hz": 0.4, "0.8 Hz": 0.8}
      fig = fnirs_epochs.compute_psd().plot_topomap(bands=bands)
      assert len(fig.axes) == 6
  
imports: import platform
  import matplotlib.pyplot
  import numpy
  import pytest
  from mne import Epochs, EpochsArray, create_info
  from mne.datasets import testing
  from mne.event import make_fixed_length_events
  from mne.viz import plot_drop_log
label_desc: Use image node_id 16 for calling a global function with example usage: test_plot_psdtopo_nirs(fnirs_epochs) without return types