def test_lower_case(self):
     self.assertTrue(_is_top_level_char("f"))
 def test_trailing_space(self):
     self.assertFalse(_is_top_level_char("B "))
 def test_multiple_chars(self):
     self.assertFalse(_is_top_level_char("BE"))
 def test_alphanum(self):
     self.assertFalse(_is_top_level_char("a2"))
 def test_numeric(self):
     self.assertFalse(_is_top_level_char("1"))
 def test_simple_case(self):
     self.assertTrue(_is_top_level_char("A"))