code: def test_set_line_coll_dash_image():
      fig = plt.figure()
      ax = fig.add_subplot(1, 1, 1, projection="skewx")
      ax.set_xlim(-50, 50)
      ax.set_ylim(50, -50)
      ax.grid(True)
  
      # An example of a slanted line at constant X
      ax.axvline(0, color="b")
  
imports: from contextlib import ExitStack
  import itertools
  import matplotlib.pyplot
  from matplotlib.testing.decorators import image_comparison
  from matplotlib.axes import Axes
  import matplotlib.transforms
  import matplotlib.axis
  import matplotlib.spines
  import matplotlib.patches
  from matplotlib.projections import register_projection
label_desc: Use image node_id 1 for calling a global function with example usage: test_set_line_coll_dash_image() without return types