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"""
Copyright (c) 2023 Proton AG
This file is part of Proton VPN.
Proton VPN is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
Proton VPN is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with ProtonVPN. If not, see <https://www.gnu.org/licenses/>.
"""
from unittest.mock import Mock, AsyncMock
import pytest
from proton.vpn.core.refresher.certificate_refresher import CertificateRefresher, generate_backoff_value
from proton.vpn.core.refresher.scheduler import RunAgain
@pytest.mark.asyncio
async def test_refresh_fetches_certificate_if_expired_and_returns_next_refresh_delay():
session_holder = Mock()
session = session_holder.session
refresher = CertificateRefresher(session_holder=session_holder)
session.fetch_certificate = AsyncMock()
new_certificate = Mock()
new_certificate.remaining_time_to_next_refresh = 600
session.fetch_certificate.return_value= new_certificate
next_refresh_delay = await refresher.refresh()
assert next_refresh_delay == RunAgain.after_seconds(new_certificate.remaining_time_to_next_refresh)
@pytest.mark.parametrize("nth_failed_attempt, expected_backoff", [
(0, 1),
(1, 2),
(2, 4),
(3, 8),
(4, 16),
(5, 32)
])
def test_generate_backoff_value_generates_expected_value(nth_failed_attempt, expected_backoff):
backoff_in_seconds = 1
random_component = 1
backoff = generate_backoff_value(
number_of_failed_refresh_attempts=nth_failed_attempt,
backoff_in_seconds=backoff_in_seconds,
random_component=random_component
)
assert backoff == expected_backoff
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