code: def test_extlibs(self):
      ip = self._ip
      code = """
  from libc.math cimport sin
  x = sin(0.0)
          """
      ip.user_ns["x"] = 1
      ip.run_cell_magic("cython", "-l m", code)
      self.assertEqual(ip.user_ns["x"], 0)
  
imports: from __future__ import absolute_import
  import os
  import sys
  from contextlib import contextmanager
  from Cython.Build import IpythonMagic
  from Cython.TestUtils import CythonTest
label_desc: Use image node_id 11 for calling the TestIPythonMagic obj's underlying member method code with example usage: obj.test_extlibs() without return types