code: def test_example(self):
      a = np.array(b"123\0\0")
      b = np.array(b"123\0\0")
      c = np.array(b"123")
      d = np.array(b"123")
  
      self.module.foo(a, b, c, d)
  
      assert a.tobytes() == b"123\0\0"
      assert b.tobytes() == b"B23\0\0"
      assert c.tobytes() == b"123"
      assert d.tobytes() == b"D23"
  
file_path: numpy/numpy/f2py/tests/test_string.py
imports: import os
  import pytest
  import textwrap
  import numpy
  from .None import util
label_desc: Use image node_id 1 for calling the TestDocStringArguments obj's underlying member method code with example usage: obj.test_example() without return types