code: def test_axline_setters():
      fig, ax = plt.subplots()
      line1 = ax.axline((0.1, 0.1), slope=0.6)
      line2 = ax.axline((0.1, 0.1), (0.8, 0.4))
      # Testing xy1, xy2 and slope setters.
      # This should not produce an error.
      line1.set_xy1(0.2, 0.3)
      line1.set_slope(2.4)
      line2.set_xy1(0.3, 0.2)
      line2.set_xy2(0.6, 0.8)
      # Testing xy1, xy2 and slope getters.
      # Should return the modified values.
      assert line1.get_xy1() == (0.2, 0.3)
      assert line1.get_slope() == 2.4
      assert line2.get_xy1() == (0.3, 0.2)
      assert line2.get_xy2() == (0.6, 0.8)
      # Testing setting xy2 and slope together.
      # These test should raise a ValueError
      with pytest.raises(
          ValueError,
          match="Cannot set an 'xy2' value while 'slope' is set",
      ):
          line1.set_xy2(0.2, 0.3)
  
      with pytest.raises(
          ValueError,
          match="Cannot set a 'slope' value while 'xy2' is set",
      ):
          line2.set_slope(3)
  
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 28 for calling a global function with example usage: test_axline_setters() without return types