code: def test_expm1_(self):
      self.run_test(
          "def expm1_(a):\n from math import expm1\n return expm1(a)",
          1,
          expm1_=[int],
      )
  
imports: from pythran.tests import TestEnv
label_desc: Use image node_id 23 for calling the TestMath obj's underlying member method code with example usage: obj.test_expm1_() without return types