code: def test_str_slice_assign(self):
      self.run_test(
          """
              def str_slice_assign(s, c):
                  if s.startswith(c):
                      s = s[len(c):];
                  return s""",
          "LEFT-B6",
          "LEFT-",
          str_slice_assign=[str, str],
      )
  
imports: from pythran.tests import TestEnv
  from pythran.typing import List
  import unittest
label_desc: Use image node_id 52 for calling the TestStr obj's underlying member method code with example usage: obj.test_str_slice_assign() without return types