code: def test_pat013_patch_mul():
      p = Patch()
      p.mulby *= 2
  
      data = patch_to_dict(p)
  
      assert data["operations"][0] == {
          "operation": "Mul",
          "location": ["mulby"],
          "params": {"value": 2},
      }
  
imports: import json
  import pytest
  from dash import Patch
  from dash._utils import to_json
label_desc: Use image node_id 14 for calling a global function with example usage: test_pat013_patch_mul() without return types