A decorator that ensures a biometric prompt in the simulator by explicitly calling LAContext.evaluatePolicy(_:localizedReason:). Helpful to improve test experience for protected keychain items in a simulator

localAuthenticationInSimulatorAsync.swift

func localAuthenticationInSimulator<T>(
    evaluating policy: LAPolicy = .deviceOwnerAuthentication,
    on context: LAContext = LAContext(),
    beforeCalling function: @escaping () -> T?
) async -> T? {
#if targetEnvironment(simulator)
    var localizedReason = context.localizedReason
    if localizedReason.isEmpty {
        localizedReason = "Test in simulator"
        context.localizedReason = localizedReason
    }
    guard context.canEvaluatePolicy(policy, error: nil) else { return nil }
    do {
        guard try await context.evaluatePolicy(policy, localizedReason: localizedReason) else { return nil }
        return function()
    } catch {
        return nil
    }
#else
    return function()
#endif
}