code: def test_flags_override(self):
      class MyPattern(Template):
          flags = 0
  
      s = MyPattern("$wHO likes ${WHAT} for ${meal}")
      d = dict(wHO="tim", WHAT="ham", meal="dinner", w="fred")
      self.assertRaises(ValueError, s.substitute, d)
      self.assertEqual(
          s.safe_substitute(d), "fredHO likes ${WHAT} for dinner"
      )
  
imports: import unittest
  import string
  from string import Template
label_desc: Use image node_id 12 for calling the TestTemplate obj's underlying member method code with example usage: obj.test_flags_override() without return types