code: def test_line_colors():
      fig, ax = plt.subplots()
      ax.plot(range(10), color="none")
      ax.plot(range(10), color="r")
      ax.plot(range(10), color=".3")
      ax.plot(range(10), color=(1, 0, 0, 1))
      ax.plot(range(10), color=(1, 0, 0))
      fig.canvas.draw()
  
imports: import itertools
  import platform
  import timeit
  from types import SimpleNamespace
  from cycler import cycler
  import numpy
  from numpy.testing import assert_array_equal
  import pytest
  import matplotlib
  import matplotlib
  from matplotlib import _path
  import matplotlib.lines
  from matplotlib.markers import MarkerStyle
  from matplotlib.path import Path
  import matplotlib.pyplot
  import matplotlib.transforms
  from matplotlib.testing.decorators import image_comparison, check_figures_equal
label_desc: Use image node_id 6 for calling a global function with example usage: test_line_colors() without return types