code: def test_default():
      """Tests default option resets the same as ``plt.style.use``."""
  
      plt.style.use("default")
      initial = plt.rcParams.copy()
  
      _set_style("black_white")
      _set_style("default")
      new = plt.rcParams.copy()
  
      # make sure dictionaries are the same
      assert (
          sum(1 for key, value in initial.items() if new[key] != value)
          == 0
      )
  
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 10 for calling a global function with example usage: test_default() without return types