TestFulfill.swift

import XCTest
import Foundation

class TestFulfill: XCTestCase {
    class FulfillOnRelease {
        let ex: XCTestExpectation
        init(_ ex: XCTestExpectation) {
            self.ex = ex
        }
        deinit {
            print("Fullfiling: \(ex.description)")
            ex.fulfill()
        }
    }

    func testFulfillWithDispatchOk() {
        let queue = DispatchQueue(label: #function)
        (0..<3).forEach { index in
            let ex = expectation(description: "\(#function) \(index)")
            let fulfillOnRelease = FulfillOnRelease(ex)
            queue.async {
                print("Retaining: \(fulfillOnRelease.ex.description)")
            }
        }
        waitForExpectations(timeout: 1, handler: nil)
    }

    func testFulfillWithOperationQueueBad() {
        let queue = OperationQueue()
        (0..<3).forEach { index in
            let ex = expectation(description: "\(#function) \(index)")
            let fulfillOnRelease = FulfillOnRelease(ex)
            queue.addOperation {
                print("Retaining: \(fulfillOnRelease.ex.description)")
            }
        }
        waitForExpectations(timeout: 1, handler: nil)
    }

    func testFulfillWithOperationQueueOk() {
        let queue = OperationQueue()
        (0..<3).forEach { index in
            let ex = expectation(description: "\(#function) \(index)")
            let fulfillOnRelease = FulfillOnRelease(ex)
            let blockOperation = BlockOperation {
                print("Retaining: \(fulfillOnRelease.ex.description)")
            }
            queue.addOperation(blockOperation)
        }
        waitForExpectations(timeout: 1, handler: nil)
    }
}

works with autoreleasepool, thanks