code: def test_black_scholes(self):
      output = example_test.run_example(
          "finance/black_scholes.py", "--n-options", "10"
      )
      pattern = _normalize_regexp_eol(
          r"initializing...\n"
          + r"start computation\n"
          + r" CPU \(NumPy, Naive implementation\):\t[0-9\.]+ sec\n"
          + r" GPU \(CuPy, Naive implementation\):\t[0-9\.]+ sec\n"
          + r" GPU \(CuPy, Elementwise kernel\):\t[0-9\.]+ sec"
      )
      assert re.search(pattern, output.decode("utf-8"))
  
file_path: cupy/tests/example_tests/test_finance.py
imports: import os
  import re
  import unittest
  from example_tests import example_test
  from cupy import testing
label_desc: Use image node_id 1 for calling the TestBlackScholes obj's underlying member method code with example usage: obj.test_black_scholes() without return types