def METHOD_NAME(self):
    """Test functionality of bad_fillet_idxs in utility_functions.py."""
    results = utility_functions.bad_fillet_idxs([(1.0, 1.0), (1.5, 1.5),
                                                 (1.51, 1.5), (2.0, 2.0)],
                                                0.1)
    self.assertEqual(results, [1, 2])