swift-testing-wait-untillisted

# `waitUntil`: No `Task.sleep` in Tests Wait for the actual state change instead of a fixed delay. Add this `TestHelpers.swift` to your test target (the lint rules already exclude `*TestHelpers.swift`): ```swift import Foundation /// Thrown by `waitUntil` when the condition never became true within the timeout. struct WaitTimeoutError: Error, CustomStringConvertible { let timeout: Duration var description: String { "waitUntil timed out after \(timeout)" } } /// Polls `condition` until true, throwing on timeout. Runs on the caller's actor /// (via `#isolation`) so the closure may read `@MainActor` fixtures safely. func waitUntil( timeout: Duration = .seconds(2), pollInterval: Duration = .milliseconds(10), isolation _: isolated (any Actor)? = #isolation, _ condition: () -> Bool ) async throws { let clock = ContinuousClock() let deadline = clock.now.advanced(by: timeout) while !condition() { guard clock.now < deadline else { throw WaitTimeoutError(timeout: timeout) } try await Task.sleep(for: pollInterval) } } ``` Usage: `try await waitUntil { viewModel.isLoaded }` instead of `try await Task.sleep(for: .seconds(1))`.