122 lines
3.3 KiB
Swift
122 lines
3.3 KiB
Swift
//
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// Copyright 2023 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 XCTest
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@testable import SignalServiceKit
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public class SerialTaskQueueTest: XCTestCase {
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func testSerialExecution() async throws {
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actor TestActor {
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var canExecuteFirstTask = false
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var numExecuted = 0
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func allowFirstTaskExecution() {
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canExecuteFirstTask = true
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}
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func markExecuted() {
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self.numExecuted += 1
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}
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}
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let queue = SerialTaskQueue()
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let testActor = TestActor()
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await queue.enqueue(operation: {
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while !(await testActor.canExecuteFirstTask) {
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await Task.yield()
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}
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let numExecuted = await testActor.numExecuted
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XCTAssertEqual(numExecuted, 0)
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await testActor.markExecuted()
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})
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let secondTask = await queue.enqueue(operation: {
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let numExecuted = await testActor.numExecuted
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XCTAssertEqual(numExecuted, 1)
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await testActor.markExecuted()
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})
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var numExecuted = await testActor.numExecuted
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XCTAssertEqual(numExecuted, 0)
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await testActor.allowFirstTaskExecution()
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_ = try await secondTask.value
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numExecuted = await testActor.numExecuted
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XCTAssertEqual(numExecuted, 2)
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// A new thing should execute immediately.
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let thirdTask = await queue.enqueue(operation: {
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await testActor.markExecuted()
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})
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_ = try await thirdTask.value
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numExecuted = await testActor.numExecuted
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XCTAssertEqual(numExecuted, 3)
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}
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func testCancellation() async throws {
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actor TestActor {
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var canExecuteFirstTask = false
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var numExecuted = 0
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func allowFirstTaskExecution() {
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canExecuteFirstTask = true
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}
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func markExecuted() {
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self.numExecuted += 1
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}
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}
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let queue = SerialTaskQueue()
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let testActor = TestActor()
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let firstTask = await queue.enqueue(operation: {
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while !(await testActor.canExecuteFirstTask) {
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try Task.checkCancellation()
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await Task.yield()
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}
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XCTFail("Should have been cancelled!")
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})
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let secondTask = await queue.enqueue(operation: {
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try Task.checkCancellation()
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XCTFail("Should have been cancelled!")
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})
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var numExecuted = await testActor.numExecuted
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XCTAssertEqual(numExecuted, 0)
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// Cancel and then enqueue a new thing.
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let thirdTask = await queue.enqueueCancellingPrevious(operation: {
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await testActor.markExecuted()
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})
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_ = try await thirdTask.value
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numExecuted = await testActor.numExecuted
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XCTAssertEqual(numExecuted, 1)
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let firstResult = await firstTask.result
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let secondResult = await secondTask.result
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for result in [firstResult, secondResult] {
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switch result {
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case .success:
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XCTFail("Should have been cancelled!")
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case .failure(let failure):
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XCTAssert(failure is CancellationError)
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}
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}
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}
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}
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