code: def test_capstyle(self):
      x = y = [1, 2]
      rc = {
          "lines.solid_capstyle": "projecting",
          "lines.dash_capstyle": "round",
      }
  
      p = Plot(x, y).add(Path()).theme(rc).plot()
      (line,) = p._figure.axes[0].get_lines()
      assert line.get_dash_capstyle() == "projecting"
  
      p = Plot(x, y).add(Path(linestyle="--")).theme(rc).plot()
      (line,) = p._figure.axes[0].get_lines()
      assert line.get_dash_capstyle() == "round"
  
      p = (
          Plot(x, y)
          .add(Path({"solid_capstyle": "butt"}))
          .theme(rc)
          .plot()
      )
      (line,) = p._figure.axes[0].get_lines()
      assert line.get_solid_capstyle() == "butt"
  
imports: import numpy
  import matplotlib
  from matplotlib.colors import same_color, to_rgba
  from numpy.testing import assert_array_equal, assert_array_almost_equal
  from seaborn._core.plot import Plot
  from seaborn._core.moves import Dodge
  from seaborn._marks.line import Dash, Line, Path, Lines, Paths, Range
label_desc: Use image node_id 10 for calling the TestPath obj's underlying member method code with example usage: obj.test_capstyle() without return types