Sample using toBlockingArray ... and a way to publish debug output!

gistfile1.txt

struct NSLoggerStream : TextOutputStream {
    mutating func write(_ string: String) {
        guard string.count > 0 && string != "\n" else { return }
        NSLog(string)
    }
}

// Test
var logger = NSLoggerStream()

let result = Publishers.Future<Int,TestError> { subscriber in
    DispatchQueue.global().asyncAfter(deadline: DispatchTime.now() + .seconds(2)) {
            subscriber(.success(42))
          //  subscriber(.failure(TestError() ))    // <== try swapping the success and failure
        }
    }
    .print("[Test Publish/Subscribe]", to: logger )
    .toBlockingResult(timeout: 5)  <== try changing the timeout to 1 second
    .map { $0.last! }

print("Result is \(result)", to: &logger)