code: def test_alt_transform():
      m1 = markers.MarkerStyle("o", "left")
      m2 = markers.MarkerStyle("o", "left", Affine2D().rotate_deg(90))
      assert (
          m1.get_alt_transform().rotate_deg(90)
          == m2.get_alt_transform()
      )
  
imports: import numpy
  import matplotlib.pyplot
  from matplotlib import markers
  from matplotlib.path import Path
  from matplotlib.testing.decorators import check_figures_equal
  from matplotlib.transforms import Affine2D
  import pytest
label_desc: Use image node_id 16 for calling a global function with example usage: test_alt_transform() without return types