code: def test_extern(self):
      self.t(
          "cdef extern from 'a.h': # comment",
          "cdef extern from '_L1_': #_L2_",
      )
  
file_path: catboost/contrib/tools/cython/Cython/Build/Tests/TestStripLiterals.py
imports: from Cython.Build.Dependencies import strip_string_literals
  from Cython.TestUtils import CythonTest
label_desc: Use image node_id 14 for calling the TestStripLiterals obj's underlying member method code with example usage: obj.test_extern() without return types