Test for CHA-PR3d spec (WIP).

Sources/AblyChat/Room.swift

@@ -423,3 +423,14 @@ internal actor DefaultRoom<LifecycleManagerFactory: RoomLifecycleManagerFactory>
         }
     }
 }
+
+#if DEBUG
+extension DefaultRoom {
+    var testsOnly_lifecycleManager: DefaultRoomLifecycleManager<DefaultRoomLifecycleContributor> {
+        guard let lifecycleManager = lifecycleManager as? DefaultRoomLifecycleManager<DefaultRoomLifecycleContributor> else {
+            preconditionFailure("DefaultRoomLifecycleManager is expected here.")
+        }
+        return lifecycleManager
+    }
+}
+#endif

Tests/AblyChatTests/DefaultRoomPresenceTests.swift

@@ -135,6 +135,41 @@ struct DefaultRoomPresenceTests {
         }
     }
 
+    // @spec CHA-PR3d
+    //@Test WIP
+    func usersMayEnterPresenceWhileAttaching() async throws {
+        // Given
+        let channelsList = [
+            MockRealtimeChannel(name: "basketball::$chat::$chatMessages"),
+        ]
+        let channels = MockChannels(channels: channelsList)
+        let realtime = MockRealtime.create(channels: channels)
+        let room = try await DefaultRoom(realtime: realtime, chatAPI: ChatAPI(realtime: realtime), roomID: "basketball", options: .init(), logger: TestLogger(), lifecycleManagerFactory: MockRoomLifecycleManagerFactory())
+
+        let lifecycleManager = await room.testsOnly_lifecycleManager
+        let statusChangeWaitSubscription = await lifecycleManager.testsOnly_subscribeToStatusChangeWaitEvents()
+
+        async let waitToBeAbleToPerformPresenceOperationsResult: Void = lifecycleManager.waitToBeAbleToPerformPresenceOperations(requestedByFeature: .presence)
+
+        // Then: The manager waits for its room status to change
+        _ = try #require(await statusChangeWaitSubscription.first { _ in true })
+
+        // Then: The call to `waitToBeAbleToPerformPresenceOperations(requestedByFeature:)` succeeds
+        try await waitToBeAbleToPerformPresenceOperationsResult
+
+        // Then
+        await #expect(throws: ARTErrorInfo.self) {
+            do {
+                try await room.presence.enter(data: ["status": "Online"])
+            } catch {
+                let error = try #require(error as? ARTErrorInfo)
+                #expect(error.statusCode == 400)
+                #expect(error.localizedDescription.contains("attach"))
+                throw error
+            }
+        }
+    }
+
     // @spec CHA-PR7a
     // @spec CHA-PR7b
     // @spec CHA-PR7c