| 1 | import Foundation |
| 2 | import XCTest |
| 3 | @testable import RastrilloApple |
| 4 | |
| 5 | final class FakePathSource: NativePathSource, @unchecked Sendable { |
| 6 | private let lock = NSLock() |
| 7 | private var update: (@Sendable (NativePath) -> Void)? |
| 8 | private(set) var cancelled = false |
| 9 | func start(_ update: @escaping @Sendable (NativePath) -> Void) { lock.withLock { self.update = update } } |
| 10 | func cancel() { lock.withLock { cancelled = true } } |
| 11 | func send(_ status: NativePath.Status) { lock.withLock { update }?(NativePath(status: status)) } |
| 12 | } |
| 13 | |
| 14 | @MainActor private final class Counter { |
| 15 | var count = 0 |
| 16 | var task: Task<Void, Never>? |
| 17 | init(_ connectivity: NativeConnectivity) { |
| 18 | let changes = connectivity.changes |
| 19 | task = Task { @MainActor [weak self] in for await _ in changes { self?.count += 1 } } |
| 20 | } |
| 21 | } |
| 22 | |
| 23 | @MainActor private func settle(until condition: () -> Bool, seconds: Double = 2) async { |
| 24 | let deadline = Date().addingTimeInterval(seconds) |
| 25 | while !condition() && Date() < deadline { try? await Task.sleep(nanoseconds: 5_000_000) } |
| 26 | } |
| 27 | |
| 28 | @MainActor final class ConnectivityTests: XCTestCase { |
| 29 | let origin = URL(string: "https://docs.example")! |
| 30 | let other = URL(string: "https://sheets.example")! |
| 31 | |
| 32 | func testOfflineFromThePathOrFromAFailedRequest() async { |
| 33 | let source = FakePathSource() |
| 34 | let connectivity = NativeConnectivity(source: source) |
| 35 | XCTAssertFalse(connectivity.isOffline(origin), "An unknown path must not block requests") |
| 36 | source.send(.unsatisfied) |
| 37 | await settle { connectivity.path?.status == .unsatisfied } |
| 38 | XCTAssertTrue(connectivity.isOffline(origin)) |
| 39 | XCTAssertTrue(connectivity.isOffline(other)) |
| 40 | source.send(.satisfied) |
| 41 | await settle { connectivity.isPathSatisfied } |
| 42 | XCTAssertFalse(connectivity.isOffline(origin)) |
| 43 | |
| 44 | connectivity.record(.offline(.cannotConnectToHost), origin: origin) |
| 45 | XCTAssertTrue(connectivity.isOffline(origin), "The path is up but that server did not answer") |
| 46 | XCTAssertFalse(connectivity.isOffline(other), "One unreachable server says nothing about another") |
| 47 | connectivity.record(.responded(status: 503), origin: origin) |
| 48 | XCTAssertFalse(connectivity.isOffline(origin), "Any response proves the server is reachable") |
| 49 | |
| 50 | connectivity.record(.offline(.timedOut), origin: origin) |
| 51 | source.send(.requiresConnection) |
| 52 | await settle { connectivity.path?.status == .requiresConnection } |
| 53 | source.send(.satisfied) |
| 54 | await settle { connectivity.isPathSatisfied } |
| 55 | XCTAssertNil(connectivity.serverReachable[origin], "A path change must forget what the old path learned") |
| 56 | } |
| 57 | |
| 58 | func testChangesFireOnPathReachabilityAndForeground() async { |
| 59 | let source = FakePathSource() |
| 60 | let connectivity = NativeConnectivity(source: source) |
| 61 | let counter = Counter(connectivity) |
| 62 | defer { counter.task?.cancel() } |
| 63 | source.send(.satisfied) |
| 64 | await settle { counter.count == 1 } |
| 65 | XCTAssertEqual(counter.count, 1, "A path change must fire") |
| 66 | connectivity.record(.responded(status: 200), origin: origin) |
| 67 | await settle { counter.count == 2 } |
| 68 | XCTAssertEqual(counter.count, 2, "A server becoming reachable must wake waiting senders") |
| 69 | connectivity.record(.responded(status: 200), origin: origin) |
| 70 | connectivity.record(.offline(.timedOut), origin: origin) |
| 71 | try? await Task.sleep(nanoseconds: 50_000_000) |
| 72 | XCTAssertEqual(counter.count, 2, "Repeated responses and failures are not changes") |
| 73 | connectivity.foregrounded() |
| 74 | await settle { counter.count == 3 } |
| 75 | XCTAssertEqual(counter.count, 3) |
| 76 | } |
| 77 | |
| 78 | func testWaitEndsEarlyWhenConnectivityChanges() async { |
| 79 | let source = FakePathSource() |
| 80 | let connectivity = NativeConnectivity(source: source) |
| 81 | source.send(.satisfied) |
| 82 | await settle { connectivity.path != nil } |
| 83 | let start = Date() |
| 84 | let waiting = Task { await connectivity.wait(upTo: 30) } |
| 85 | try? await Task.sleep(nanoseconds: 50_000_000) |
| 86 | connectivity.foregrounded() |
| 87 | let changed = await waiting.value |
| 88 | XCTAssertLessThan(Date().timeIntervalSince(start), 2, "A change must cut the backoff short") |
| 89 | XCTAssertTrue(changed, "The caller must learn that connectivity changed, to reset its backoff") |
| 90 | |
| 91 | let timed = Date() |
| 92 | let elapsed = await connectivity.wait(upTo: 0.05) |
| 93 | XCTAssertLessThan(Date().timeIntervalSince(timed), 1, "The delay must elapse on its own") |
| 94 | XCTAssertFalse(elapsed, "An elapsed delay is not a change") |
| 95 | } |
| 96 | |
| 97 | /// The battery rule: while the path is down, no timer runs at all. |
| 98 | func testNoTimedAttemptsWhileThePathIsDown() async { |
| 99 | let source = FakePathSource() |
| 100 | let connectivity = NativeConnectivity(source: source) |
| 101 | source.send(.unsatisfied) |
| 102 | await settle { connectivity.path != nil } |
| 103 | var returned = false |
| 104 | let waiting = Task { @MainActor in await connectivity.wait(upTo: 0.01); returned = true } |
| 105 | try? await Task.sleep(nanoseconds: 300_000_000) |
| 106 | XCTAssertFalse(returned, "A backoff delay elapsed while the path was down") |
| 107 | source.send(.satisfied) |
| 108 | await settle { returned } |
| 109 | XCTAssertTrue(returned, "A restored path must end the wait at once") |
| 110 | waiting.cancel() |
| 111 | } |
| 112 | |
| 113 | func testNativeHTTPReportsThroughTheObserver() async throws { |
| 114 | let fd = socket(AF_INET, SOCK_STREAM, 0) |
| 115 | var address = sockaddr_in() |
| 116 | address.sin_family = sa_family_t(AF_INET) |
| 117 | address.sin_addr.s_addr = inet_addr("127.0.0.1") |
| 118 | var length = socklen_t(MemoryLayout<sockaddr_in>.size) |
| 119 | _ = withUnsafeMutablePointer(to: &address) { |
| 120 | $0.withMemoryRebound(to: sockaddr.self, capacity: 1) { Darwin.bind(fd, $0, length) == 0 ? getsockname(fd, $0, &length) : -1 } |
| 121 | } |
| 122 | close(fd) |
| 123 | let closed = URL(string: "http://127.0.0.1:\(UInt16(bigEndian: address.sin_port))")! |
| 124 | let connectivity = NativeConnectivity(source: FakePathSource()) |
| 125 | let client = NativeHTTP(origin: closed, observer: connectivity.observer(for: closed)) |
| 126 | _ = try? await client.responseDetails("/") |
| 127 | await settle { connectivity.serverReachable[closed] != nil } |
| 128 | XCTAssertEqual(connectivity.serverReachable[closed], false) |
| 129 | XCTAssertTrue(connectivity.isOffline(closed)) |
| 130 | } |
| 131 | |
| 132 | func testNetworkPathSourceDeliversAPath() async { |
| 133 | let connectivity = NativeConnectivity(source: NativeNetworkPathSource()) |
| 134 | await settle(until: { connectivity.path != nil }, seconds: 5) |
| 135 | XCTAssertNotNil(connectivity.path, "NWPathMonitor never reported a path") |
| 136 | } |
| 137 | } |
| 138 | |
amadan