Mid-Level
August 19, 2026Spot the bug: iOS
One snippet. Find the bug, or prove there isn't one.
swift
1import XCTest
2@testable import MyApp
3
4final class TimerTests: XCTestCase {
5 func testCountdown() {
6 let countdown = Countdown(seconds: 2)
7 countdown.start()
8 Thread.sleep(forTimeInterval: 3)
9 XCTAssertTrue(countdown.isFinished)
10 }
11}
12Click the lines that carry the problem.
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