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// This source file is part of the Swift.org open source project
//
// Copyright (c) 2014 - 2016 Apple Inc. and the Swift project authors
// Licensed under Apache License v2.0 with Runtime Library Exception
//
// See http://swift.org/LICENSE.txt for license information
// See http://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
//
final class NotificationCenterDummyObject : NSObject, Sendable { }
class TestNotificationCenter : XCTestCase {
func test_defaultCenter() {
let defaultCenter1 = NotificationCenter.default
let defaultCenter2 = NotificationCenter.default
XCTAssertEqual(defaultCenter1, defaultCenter2)
}
func removeObserver(_ observer: NSObjectProtocol, notificationCenter: NotificationCenter) {
guard let observer = observer as? NSObject else {
return
}
notificationCenter.removeObserver(observer)
}
func test_postNotification() {
let notificationCenter = NotificationCenter()
let notificationName = Notification.Name(rawValue: "test_postNotification_name")
nonisolated(unsafe) var flag = false
let dummyObject = NotificationCenterDummyObject()
let observer = notificationCenter.addObserver(forName: notificationName, object: dummyObject, queue: nil) { notification in
XCTAssertEqual(notificationName, notification.name)
XCTAssertTrue(dummyObject === notification.object as? NotificationCenterDummyObject)
flag = true
}
notificationCenter.post(name: notificationName, object: dummyObject)
XCTAssertTrue(flag)
removeObserver(observer, notificationCenter: notificationCenter)
}
func test_postNotificationForObject() {
let notificationCenter = NotificationCenter()
let notificationName = Notification.Name(rawValue: "test_postNotificationForObject_name")
nonisolated(unsafe) var flag = true
let dummyObject = NotificationCenterDummyObject()
let dummyObject2 = NotificationCenterDummyObject()
let observer = notificationCenter.addObserver(forName: notificationName, object: dummyObject, queue: nil) { notification in
flag = false
}
notificationCenter.post(name: notificationName, object: dummyObject2)
XCTAssertTrue(flag)
removeObserver(observer, notificationCenter: notificationCenter)
}
func test_postMultipleNotifications() {
let notificationCenter = NotificationCenter()
let notificationName = Notification.Name(rawValue: "test_postMultipleNotifications_name")
nonisolated(unsafe) var flag1 = false
let observer1 = notificationCenter.addObserver(forName: notificationName, object: nil, queue: nil) { _ in
flag1 = true
}
nonisolated(unsafe) var flag2 = true
let observer2 = notificationCenter.addObserver(forName: notificationName, object: nil, queue: nil) { _ in
flag2 = false
}
nonisolated(unsafe) var flag3 = false
let observer3 = notificationCenter.addObserver(forName: notificationName, object: nil, queue: nil) { _ in
flag3 = true
}
removeObserver(observer2, notificationCenter: notificationCenter)
notificationCenter.post(name: notificationName, object: nil)
XCTAssertTrue(flag1)
XCTAssertTrue(flag2)
XCTAssertTrue(flag3)
removeObserver(observer1, notificationCenter: notificationCenter)
removeObserver(observer3, notificationCenter: notificationCenter)
}
func test_addObserverForNilName() {
let notificationCenter = NotificationCenter()
let notificationName = Notification.Name(rawValue: "test_addObserverForNilName_name")
let invalidNotificationName = Notification.Name(rawValue: "test_addObserverForNilName_name_invalid")
nonisolated(unsafe) var flag1 = false
let observer1 = notificationCenter.addObserver(forName: notificationName, object: nil, queue: nil) { _ in
flag1 = true
}
nonisolated(unsafe) var flag2 = true
let observer2 = notificationCenter.addObserver(forName: invalidNotificationName, object: nil, queue: nil) { _ in
flag2 = false
}
nonisolated(unsafe) var flag3 = false
let observer3 = notificationCenter.addObserver(forName: nil, object: nil, queue: nil) { _ in
flag3 = true
}
notificationCenter.post(name: notificationName, object: nil)
XCTAssertTrue(flag1)
XCTAssertTrue(flag2)
XCTAssertTrue(flag3)
removeObserver(observer1, notificationCenter: notificationCenter)
removeObserver(observer2, notificationCenter: notificationCenter)
removeObserver(observer3, notificationCenter: notificationCenter)
}
func test_removeObserver() {
let notificationCenter = NotificationCenter()
let notificationName = Notification.Name(rawValue: "test_removeObserver_name")
nonisolated(unsafe) var flag = true
let observer = notificationCenter.addObserver(forName: notificationName, object: nil, queue: nil) { _ in
flag = false
}
removeObserver(observer, notificationCenter: notificationCenter)
notificationCenter.post(name: notificationName, object: nil)
XCTAssertTrue(flag)
}
func test_observeOnPostingQueue() {
let notificationCenter = NotificationCenter()
let name = Notification.Name(rawValue: "\(#function)_name")
let postingQueue = OperationQueue()
let expectation = self.expectation(description: "Observer was not notified.")
_ = notificationCenter.addObserver(forName: name, object: nil, queue: nil) { _ in
XCTAssertEqual(OperationQueue.current, postingQueue)
expectation.fulfill()
}
postingQueue.addOperation {
notificationCenter.post(name: name, object: nil)
}
self.waitForExpectations(timeout: 1)
}
func test_observeOnSpecificQueuePostFromMainQueue() {
let name = Notification.Name(rawValue: "\(#function)_name")
let notificationCenter = NotificationCenter()
let operationQueue = OperationQueue()
nonisolated(unsafe) var flag1 = false
nonisolated(unsafe) var flag2 = false
_ = notificationCenter.addObserver(forName: name, object: nil, queue: operationQueue) { _ in
XCTAssertEqual(OperationQueue.current, operationQueue)
flag1 = true
}
_ = notificationCenter.addObserver(forName: name, object: nil, queue: .main) { _ in
XCTAssertEqual(OperationQueue.current, .main)
flag2 = true
}
notificationCenter.post(name: name, object: nil)
// All observers should be notified synchronously regardless of the observer queue.
XCTAssertTrue(flag1)
XCTAssertTrue(flag2)
}
func test_observeOnSpecificQueuePostFromObservedQueue() {
let name = Notification.Name(rawValue: "\(#function)_name")
let notificationCenter = NotificationCenter()
let observingQueue = OperationQueue()
let expectation = self.expectation(description: "Notification posting operation was not executed.")
// Protected by the inherent ordering of notification center posts - which is the point of this test
nonisolated(unsafe) var flag1 = false
nonisolated(unsafe) var flag2 = false
_ = notificationCenter.addObserver(forName: name, object: nil, queue: observingQueue) { _ in
XCTAssertEqual(OperationQueue.current, observingQueue)
flag1 = true
}
_ = notificationCenter.addObserver(forName: name, object: nil, queue: .main) { _ in
XCTAssertEqual(OperationQueue.current, .main)
flag2 = true
}
observingQueue.addOperation {
notificationCenter.post(name: name, object: nil)
// All observers should be notified synchronously regardless of the observer queue.
XCTAssertTrue(flag1)
XCTAssertTrue(flag2)
expectation.fulfill()
}
self.waitForExpectations(timeout: 1)
}
func test_observeOnSpecificQueuePostFromUnrelatedQueue() {
let name = Notification.Name(rawValue: "\(#function)_name")
let notificationCenter = NotificationCenter()
let operationQueue = OperationQueue()
let postingQueue = OperationQueue()
let expectation = self.expectation(description: "Notification posting operation was not executed.")
// Protected by the inherent ordering of notification center posts - which is the point of this test
nonisolated(unsafe) var flag1 = false
nonisolated(unsafe) var flag2 = false
_ = notificationCenter.addObserver(forName: name, object: nil, queue: operationQueue) { _ in
XCTAssertEqual(OperationQueue.current, operationQueue)
flag1 = true
}
_ = notificationCenter.addObserver(forName: name, object: nil, queue: .main) { _ in
XCTAssertEqual(OperationQueue.current, .main)
flag2 = true
}
postingQueue.addOperation {
notificationCenter.post(name: name, object: nil)
// All observers should be notified synchronously regardless of the observer queue.
XCTAssertTrue(flag1)
XCTAssertTrue(flag2)
expectation.fulfill()
}
self.waitForExpectations(timeout: 1)
}
}
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