SwiftTask/SwiftTaskTests/BasicTests.swift at cb488a616c5504725eb88720bfe365d4d4ead747 · ReactKit/SwiftTask · GitHub

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//
//  BasicTests.swift
//  SwiftTask
//
//  Created by Yasuhiro Inami on 2014/08/27.
//  Copyright (c) 2014年 Yasuhiro Inami. All rights reserved.
//

import SwiftTask
import Async
import XCTest

class BasicTests: _TestCase
{
    func testExample()
    {
        typealias Task = SwiftTask.Task<Float, String, ErrorString>

        let expect = self.expectation(description: #function)

        // define task
        let task = Task { progress, fulfill, reject, configure in

            Async.main(after: 0.1) {
                progress(0.0)
                progress(1.0)

                if arc4random_uniform(2) == 0 {
                    fulfill("OK")
                }
                else {
                    reject("ERROR")
                }
            }
            return

        }

        task.progress { oldProgress, newProgress in

            print("progress = \(newProgress)")

        }.success { value -> String in  // `task.success {...}` = JavaScript's `promise.then(onFulfilled)`

            XCTAssertEqual(value, "OK")
            return "Now OK"

        }.failure { error, isCancelled -> String in  // `task.failure {...}` = JavaScript's `promise.catch(onRejected)`

            XCTAssertEqual(error!, "ERROR")
            return "Now RECOVERED"

        }.then { value, errorInfo -> Task in // `task.then {...}` = JavaScript's `promise.then(onFulfilled, onRejected)`

            print("value = \(value ?? "")") // either "Now OK" or "Now RECOVERED"

            XCTAssertTrue(value!.hasPrefix("Now"))
            XCTAssertTrue(errorInfo == nil)

            return Task(error: "ABORT")

        }.then { value, errorInfo -> Void in

            print("errorInfo = \(errorInfo ?? "")")

            XCTAssertTrue(value == nil)
            XCTAssertEqual(errorInfo!.error!, "ABORT")
            expect.fulfill()

        }

        self.wait()
    }

}