code: def test_consistency(key):
      """Test defaults consistency."""
      units = set(_handle_default("units"))
      other = set(_handle_default(key))
      au_keys = set("stim exci syst resp ias chpi".split())
      assert au_keys.intersection(units) == set()
      if key in ("color", "scalings_plot_raw"):
          assert au_keys.issubset(other)
          other = other.difference(au_keys)
      else:
          assert au_keys.intersection(other) == set()
      assert units == other, key
  
imports: from copy import deepcopy
  import pytest
  from numpy.testing import assert_allclose
  from mne.defaults import _handle_default
  from mne.io.base import _get_scaling
label_desc: Use image node_id 3 for calling a global function with example usage: test_consistency(key) without return types