67 lines
2 KiB
Swift
67 lines
2 KiB
Swift
//
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// Copyright 2024 Signal Messenger, LLC
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// SPDX-License-Identifier: AGPL-3.0-only
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//
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import Foundation
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import Testing
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@testable import SignalServiceKit
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private struct CompletionSerializerTest {
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@Test
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func testInOrder() {
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// If this hangs, somebody probably obsoleted CompletionSerializer.
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var completionSerializer = CompletionSerializer()
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let result = runTest(enqueueInOrder: { tx, block in
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completionSerializer.addOrderedSyncCompletion(tx: tx, block: block)
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})
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#expect(result == [1, 2])
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}
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@Test
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func testOutOfOrder() {
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// If this hangs, somebody probably obsoleted CompletionSerializer.
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let result = runTest(enqueueInOrder: { tx, block in
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tx.addSyncCompletion(block)
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})
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#expect(result == [2, 1])
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}
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private func runTest(enqueueInOrder: @escaping (any DBWriteTransaction, @escaping () -> Void) -> Void) -> [Int] {
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let inMemoryDb = InMemoryDB()
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let completions = AtomicArray<Int>(lock: .init())
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let firstWrite = DispatchSemaphore(value: 0)
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let secondCompletion = DispatchSemaphore(value: 0)
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let thirdCompletion = DispatchSemaphore(value: 0)
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DispatchQueue.global().async {
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inMemoryDb.write { tx in
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firstWrite.signal()
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tx.addSyncCompletion {
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secondCompletion.wait()
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}
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enqueueInOrder(tx, {
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completions.append(1)
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})
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tx.addSyncCompletion {
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thirdCompletion.signal()
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}
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}
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}
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DispatchQueue.global().async {
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firstWrite.wait()
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inMemoryDb.write { tx in
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enqueueInOrder(tx, {
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completions.append(2)
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secondCompletion.signal()
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})
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}
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}
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thirdCompletion.wait()
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return completions.get()
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}
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}
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