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//
// RetryStrategyTests.swift
// MullvadRESTTests
//
// Created by Marco Nikic on 2024-06-07.
// Copyright © 2025 Mullvad VPN AB. All rights reserved.
//
import Foundation
import XCTest
@testable import MullvadREST
@testable import MullvadTypes
class RetryStrategyTests: XCTestCase {
func testJitteredBackoffDoesNotGoBeyondMaxDelay() throws {
let maxDelay = REST.CodableDuration(seconds: 10, attoseconds: 0)
let retryDelay = REST.RetryDelay.exponentialBackoff(initial: .seconds(1), multiplier: 2, maxDelay: maxDelay)
let retry = REST.RetryStrategy(maxRetryCount: 0, delay: retryDelay, applyJitter: true)
let iterator = retry.makeDelayIterator()
var previousDelay = Duration(secondsComponent: 0, attosecondsComponent: 0)
for _ in 0...10 {
let currentDelay = try XCTUnwrap(iterator.next())
XCTAssertLessThanOrEqual(previousDelay, currentDelay)
XCTAssertLessThanOrEqual(currentDelay, maxDelay.duration)
previousDelay = currentDelay
}
}
func testJitteredConstantCannotBeMoreThanDouble() throws {
let retryDelay = REST.RetryDelay.constant(.seconds(10))
let retry = REST.RetryStrategy(maxRetryCount: 0, delay: retryDelay, applyJitter: true)
let iterator = retry.makeDelayIterator()
let minimumDelay = Duration(secondsComponent: 10, attosecondsComponent: 0)
let maximumDelay = Duration(secondsComponent: 20, attosecondsComponent: 0)
for _ in 0...10 {
let currentDelay = try XCTUnwrap(iterator.next())
let maximumJitterRange = minimumDelay...maximumDelay
print(currentDelay)
XCTAssertLessThanOrEqual(maximumJitterRange.lowerBound, currentDelay)
XCTAssertGreaterThanOrEqual(maximumJitterRange.upperBound, currentDelay)
}
}
func testCannotApplyJitterToNeverRetry() throws {
let retryDelay = REST.RetryDelay.never
let retry = REST.RetryStrategy(maxRetryCount: 0, delay: retryDelay, applyJitter: true)
let iterator = retry.makeDelayIterator()
XCTAssertNil(iterator.next())
}
}
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