code: def test_event_color_dict():
      """Test handling of event_color."""
      one = _make_event_color_dict("k")
      two = _make_event_color_dict((0, 0, 0))
      three = _make_event_color_dict("#000")
      assert one == two
      assert one == three
      # test dict with integer keys / event name keys
      event_id = dict(foo=1, bar=2)
      one = _make_event_color_dict({1: "r", 2: "b"}, event_id=event_id)
      two = _make_event_color_dict(
          dict(foo="r", bar="b"), event_id=event_id
      )
      assert one == two
      # test default value
      one = _make_event_color_dict({1: "r", -1: "b"}, event_id=event_id)
      two = _make_event_color_dict({1: "r", 2: "b"}, event_id=event_id)
      assert one[2] == two[2]
      # test error
      with pytest.raises(
          KeyError, match="must be strictly positive, or -1"
      ):
          _ = _make_event_color_dict({-2: "r", -1: "b"})
  
imports: from pathlib import Path
  import matplotlib.pyplot
  import numpy
  import pytest
  from numpy.testing import assert_allclose
  from mne import read_evokeds
  from mne.epochs import Epochs
  from mne.event import read_events
  from mne.io import read_raw_fif
  from mne.viz import ClickableImage, add_background_image, mne_analyze_colormap
  from mne.viz.ui_events import ColormapRange, link, subscribe
  from mne.viz.utils import _compute_scalings, _fake_click, _fake_keypress, _fake_scroll, _get_color_list, _make_event_color_dict, _setup_vmin_vmax, _validate_if_list_of_axes, centers_to_edges, compare_fiff, concatenate_images
label_desc: Use image node_id 10 for calling a global function with example usage: test_event_color_dict() without return types