def METHOD_NAME(self):
    """test Language#get_concept_code"""
    language = self.dummy_language
    # Test unknown concept
    self.assertEqual(language.concept_code("12345"), "")
    # Test known concept
    self.assertEqual(language.concept_code("concept1"), "abc")
    self.assertEqual(language.concept_code("concept2"), "abc")
    self.assertEqual(language.concept_code("concept3"), "")
    self.assertEqual(language.concept_code("concept4"), "line1\nline2")