async def test_invalid_public_key():
auth = SimpleAuthenticator()
auth.public_key_value = 'whatever'
auth._now_unix = lambda: TS
with pytest.raises(FailedInboundAuthentication) as excinfo:
await auth.authenticate_platform(PLATFORM, TIMESTAMP, VALID_SIGNATURE)
assert excinfo.value.args[0] == 'RSA key format is not supported'
