Fix tests on macOS

        // check verification result - this is an invalid signature

        // defined in openssl crypto/cms/cms.h

        const CMS_R_CERTIFICATE_VERIFY_ERROR: i32 = 100;

        match res {

            Err(es) => {

        let es = res.unwrap_err();

        let error_array = es.errors();

        assert_eq!(1, error_array.len());

                let code = error_array[0].code();

                assert_eq!(ffi::ERR_GET_REASON(code), CMS_R_CERTIFICATE_VERIFY_ERROR);

            }

            _ => panic!("expected CMS verification error, got Ok()"),

        }

        let code = error_array[0].reason_code();

        assert_eq!(code, CMS_R_CERTIFICATE_VERIFY_ERROR);

    }

}

                retain_fallbacks as _,

            ))?;

            // OSSL_PROVIDER_try_load seems to leave errors on the stack, even

            // when it succeeds.

            let _ = ErrorStack::get();

            Ok(Provider::from_ptr(p))

        }

    }