code: def test_black_white_style_dark():
      """Tests the black white style dark sets ``plt.rcParams`` with correct values"""
  
      _set_style("black_white_dark")
  
      almost_black = "#151515"
      assert plt.rcParams["savefig.facecolor"] == almost_black
      assert plt.rcParams["figure.facecolor"] == almost_black
      assert plt.rcParams["axes.facecolor"] == almost_black
      assert plt.rcParams["patch.edgecolor"] == "white"
      assert plt.rcParams["patch.facecolor"] == almost_black
      assert plt.rcParams["patch.force_edgecolor"]  # = True
      assert plt.rcParams["lines.color"] == "white"
      assert plt.rcParams["text.color"] == "white"
      assert plt.rcParams["path.sketch"] is None
  
file_path: pennylane/tests/drawer/test_style.py
imports: import pytest
  import pennylane
  from pennylane.drawer.style import _set_style
label_desc: Use image node_id 4 for calling a global function with example usage: test_black_white_style_dark() without return types