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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
//
class TestRunLoop : XCTestCase {
func test_constants() {
XCTAssertEqual(RunLoop.Mode.common.rawValue, "kCFRunLoopCommonModes",
"\(RunLoop.Mode.common.rawValue) is not equal to kCFRunLoopCommonModes")
XCTAssertEqual(RunLoop.Mode.default.rawValue, "kCFRunLoopDefaultMode",
"\(RunLoop.Mode.default.rawValue) is not equal to kCFRunLoopDefaultMode")
}
func test_runLoopInit() {
let mainRunLoop = RunLoop.main
let currentRunLoop = RunLoop.current
let secondAccessOfMainLoop = RunLoop.main
XCTAssertEqual(mainRunLoop, secondAccessOfMainLoop, "fetching the main loop a second time should be equal")
XCTAssertTrue(mainRunLoop === secondAccessOfMainLoop, "fetching the main loop a second time should be identical")
let secondAccessOfCurrentLoop = RunLoop.current
XCTAssertEqual(currentRunLoop, secondAccessOfCurrentLoop, "fetching the current loop a second time should be equal")
XCTAssertTrue(currentRunLoop === secondAccessOfCurrentLoop, "fetching the current loop a second time should be identical")
// We can assume that the tests will be run on the main run loop
// so the current loop should be the main loop
XCTAssertEqual(mainRunLoop, currentRunLoop, "the current run loop should be the main loop")
}
func test_runLoopRunMode() {
// RunLoop is not sendable, but we do want to verify that the current run loop here is the one we access below in the Timer block
nonisolated(unsafe) let runLoop = RunLoop.current
let timeInterval = TimeInterval(0.05)
let endDate = Date(timeInterval: timeInterval, since: Date())
// Protected by the ordering of the run loop - that is what this test verifies
nonisolated(unsafe) var flag = false
let dummyTimer = Timer.scheduledTimer(withTimeInterval: 0.01, repeats: false) { _ in
flag = true
guard let runLoopMode = runLoop.currentMode else {
XCTFail("Run loop mode is not defined")
return
}
XCTAssertEqual(runLoopMode, RunLoop.Mode.default)
}
runLoop.add(dummyTimer, forMode: .default)
let result = runLoop.run(mode: .default, before: endDate)
XCTAssertTrue(result)
XCTAssertTrue(flag)
}
func test_runLoopLimitDate() {
let runLoop = RunLoop.current
let timeInterval = TimeInterval(1)
let expectedTimeInterval = Date(timeInterval: timeInterval, since: Date()).timeIntervalSince1970
let dummyTimer = Timer.scheduledTimer(withTimeInterval: timeInterval, repeats: false) { _ in }
runLoop.add(dummyTimer, forMode: .default)
guard let timerTickInterval = runLoop.limitDate(forMode: .default)?.timeIntervalSince1970 else {
return
}
XCTAssertLessThan(abs(timerTickInterval - expectedTimeInterval), 0.01)
}
func test_runLoopPoll() {
let runLoop = RunLoop.current
let startDate = Date()
runLoop.run(until: Date())
let endDate = Date()
XCTAssertLessThan(endDate.timeIntervalSince(startDate), 0.5)
}
func test_commonModes() {
let runLoop = RunLoop.current
let done = expectation(description: "The timer has fired")
let timer = Timer(timeInterval: 1, repeats: false) { (_) in
done.fulfill()
}
runLoop.add(timer, forMode: .common)
waitForExpectations(timeout: 10)
}
func test_addingRemovingPorts() {
let runLoop = RunLoop.current
var didDeallocate = false
do {
let port = TestPort {
didDeallocate = true
}
let customMode = RunLoop.Mode(rawValue: "Custom")
XCTAssertEqual(port.scheduledModes, [])
runLoop.add(port, forMode: .default)
XCTAssertEqual(port.scheduledModes, [.default])
runLoop.add(port, forMode: .default)
XCTAssertEqual(port.scheduledModes, [.default])
runLoop.add(port, forMode: customMode)
XCTAssertEqual(port.scheduledModes, [.default, customMode])
runLoop.remove(port, forMode: customMode)
XCTAssertEqual(port.scheduledModes, [.default])
runLoop.add(port, forMode: customMode)
XCTAssertEqual(port.scheduledModes, [.default, customMode])
port.invalidate()
}
XCTAssertTrue(didDeallocate)
}
nonisolated(unsafe) var asyncExecuted = false
func test_mainDispatchQueueCallout() {
let runLoop = RunLoop.current
nonisolated(unsafe) let nonisolatedSelf = self
DispatchQueue.main.async {
nonisolatedSelf.asyncExecuted = true
}
// RunLoop should service main queue
_ = runLoop.run(mode: .default, before: Date(timeIntervalSinceNow: 2))
XCTAssertTrue(asyncExecuted, "Main queue async code should be executed")
asyncExecuted = false
DispatchQueue.main.async {
nonisolatedSelf.asyncExecuted = true
}
// Second run to be sure RunLoop will not stuck
_ = runLoop.run(mode: .default, before: Date(timeIntervalSinceNow: 2))
XCTAssertTrue(asyncExecuted, "Main queue async code should be executed")
// Protected by the ordering of the run loop - that is what this test verifies
nonisolated(unsafe) var timerFired = false
let dummyTimer = Timer.scheduledTimer(withTimeInterval: 0.5, repeats: false) { _ in
timerFired = true
}
runLoop.add(dummyTimer, forMode: .default)
// At this moment RunLoop has no work to do except waiting for timer.
// But RunLoop will exit prematurely if event from previous async calls
// got stuck in wrong state.
_ = runLoop.run(mode: .default, before: Date(timeIntervalSinceNow: 2))
XCTAssertTrue(timerFired, "Time should fire already")
}
}
class TestPort: Port {
let sentinel: () -> Void
init(sentinel: @escaping () -> Void) {
self.sentinel = sentinel
super.init()
}
// Required on Darwin
required init?(coder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
deinit {
invalidate()
sentinel()
}
private var _isValid = true
open override var isValid: Bool { return _isValid }
open override func invalidate() {
guard isValid else { return }
_isValid = false
NotificationCenter.default.post(name: Port.didBecomeInvalidNotification, object: self)
}
var scheduledModes: [RunLoop.Mode] = []
open override func schedule(in runLoop: RunLoop, forMode mode: RunLoop.Mode) {
scheduledModes.append(mode)
}
open override func remove(from runLoop: RunLoop, forMode mode: RunLoop.Mode) {
scheduledModes = scheduledModes.filter { $0 != mode }
}
}
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