patrickserrano 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):
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)).