code: def test_tan_(self):
      self.run_test(
          "def tan_(a):\n from math import tan\n return tan(a)",
          1,
          tan_=[int],
      )
  
imports: from pythran.tests import TestEnv
label_desc: Use image node_id 20 for calling the TestMath obj's underlying member method code with example usage: obj.test_tan_() without return types