code: def test_offset_halign(self):
      x = y = [1, 2, 3]
      s = list("abc")
      m = Text(halign="right", fontsize=10, offset=0.5)
      p = Plot(x, y, text=s).add(m).plot()
      ax = p._figure.axes[0]
      expected_shift_matrix = np.zeros((3, 3))
      expected_shift_matrix[0, -1] = -m.offset * ax.figure.dpi / 72
      ax_trans = ax.transData.get_matrix()
      for text in self.get_texts(ax):
          shift_matrix = text.get_transform().get_matrix() - ax_trans
          assert_array_almost_equal(shift_matrix, expected_shift_matrix)
  
file_path: seaborn/tests/_marks/test_text.py
imports: import numpy
  from matplotlib.colors import to_rgba
  from matplotlib.text import Text
  from numpy.testing import assert_array_almost_equal
  from seaborn._core.plot import Plot
  from seaborn._marks.text import Text
label_desc: Use image node_id 9 for calling the TestText obj's underlying member method code with example usage: obj.test_offset_halign() without return types