    def test_oneOf_traversal_for_single_equally_relevant_error(self):
        """
        We *do* traverse oneOf with a single nested error, even though it is
        vacuously equally relevant to itself.
        """

        schema = {
            "oneOf": [
                {"type": "string"},
            ],
        }
        best = self.best_match_of(instance=[], schema=schema)
        self.assertEqual(best.validator, "type")
We *do* traverse oneOf with a single nested error, even though it is
vacuously equally relevant to itself.
jsonschema/tests/test_exceptions.py