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//
// ExponentialBackoffTests.swift
// ExponentialBackoffTests
//
// Created by pronebird on 05/11/2022.
// Copyright © 2025 Mullvad VPN AB. All rights reserved.
//
import MullvadTypes
import XCTest
@testable import MullvadREST
final class ExponentialBackoffTests: XCTestCase {
func testExponentialBackoff() {
var backoff = ExponentialBackoff(initial: .seconds(2), multiplier: 3, maxDelay: .seconds(18))
XCTAssertEqual(backoff.next(), .seconds(2))
XCTAssertEqual(backoff.next(), .seconds(6))
XCTAssertEqual(backoff.next(), .seconds(18))
}
func testAtMaximumValue() {
var backoff = ExponentialBackoff(initial: .milliseconds(.max - 1), multiplier: 2, maxDelay: .seconds(.max - 1))
XCTAssertEqual(backoff.next(), .milliseconds(.max - 1))
XCTAssertEqual(backoff.next(), .milliseconds(.max))
XCTAssertEqual(backoff.next(), .milliseconds(.max))
}
func testMaximumBound() {
var backoff = ExponentialBackoff(
initial: .milliseconds(2),
multiplier: 3,
maxDelay: .milliseconds(7)
)
XCTAssertEqual(backoff.next(), .milliseconds(2))
XCTAssertEqual(backoff.next(), .milliseconds(6))
XCTAssertEqual(backoff.next(), .milliseconds(7))
}
func testMinimumValue() {
var backoff = ExponentialBackoff(initial: .milliseconds(0), multiplier: 10, maxDelay: .milliseconds(0))
XCTAssertEqual(backoff.next(), .milliseconds(0))
XCTAssertEqual(backoff.next(), .milliseconds(0))
backoff = ExponentialBackoff(initial: .milliseconds(1), multiplier: 0, maxDelay: .zero)
XCTAssertEqual(backoff.next(), .milliseconds(0))
XCTAssertEqual(backoff.next(), .milliseconds(0))
}
func testJitter() {
let initial: Duration = .milliseconds(500)
var iterator = Jittered(ExponentialBackoff(initial: initial, multiplier: 3, maxDelay: .milliseconds(1500)))
XCTAssertGreaterThanOrEqual(iterator.next()!, initial)
}
}
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