Yeah, see the MGF1 sha1 tests in `test_openssl` for an example of that.

```python
    @pytest.mark.skipif(
        backend._lib.OPENSSL_VERSION_NUMBER >= 0x1000100f,
        reason="Requires an older OpenSSL. Must be < 1.0.1"
    )
    def test_non_sha1_pss_mgf1_hash_algorithm_on_old_openssl(self):
```