diff --git a/Sources/AblyChat/Room.swift b/Sources/AblyChat/Room.swift
index 80e168b..20bf57c 100644
--- a/Sources/AblyChat/Room.swift
+++ b/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
diff --git a/Tests/AblyChatTests/DefaultRoomPresenceTests.swift b/Tests/AblyChatTests/DefaultRoomPresenceTests.swift
index 710f21f..7c26353 100644
--- a/Tests/AblyChatTests/DefaultRoomPresenceTests.swift
+++ b/Tests/AblyChatTests/DefaultRoomPresenceTests.swift
@@ -135,6 +135,32 @@ struct DefaultRoomPresenceTests {
         }
     }
 
+    // @specPartial CHA-PR3d (WIP: needs failure case)
+    @Test
+    func usersMayEnterPresenceWhileAttaching() async throws {
+        // Given
+        let realtimePresence = MockRealtimePresence(["client1"].map { .init(clientId: $0) })
+        let channelsList = [
+            MockRealtimeChannel(name: "basketball::$chat::$chatMessages", attachResult: .delayedSuccess, mockPresence: realtimePresence),
+        ]
+        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(presence: .init()), logger: TestLogger(), lifecycleManagerFactory: DefaultRoomLifecycleManagerFactory())
+
+        let lifecycleManager = await room.testsOnly_lifecycleManager
+        let attachingStatusWaitSubscription = await lifecycleManager.testsOnly_subscribeToStatusChangeWaitEvents()
+
+        // When: The room is in the attaching state and presence enter is called
+        Task {
+            try await lifecycleManager.performAttachOperation()
+        }
+        try await room.presence.enter()
+
+        // Then: The manager waits for its room status to change
+        _ = try #require(await attachingStatusWaitSubscription.first { _ in true })
+        #expect(await room.status == .attached)
+    }
+
     // @spec CHA-PR7a
     // @spec CHA-PR7b
     // @spec CHA-PR7c
diff --git a/Tests/AblyChatTests/Mocks/MockRealtimeChannel.swift b/Tests/AblyChatTests/Mocks/MockRealtimeChannel.swift
index 26026cc..c7fe4da 100644
--- a/Tests/AblyChatTests/Mocks/MockRealtimeChannel.swift
+++ b/Tests/AblyChatTests/Mocks/MockRealtimeChannel.swift
@@ -91,11 +91,20 @@ final class MockRealtimeChannel: NSObject, RealtimeChannelProtocol {
         case success
         case failure(ARTErrorInfo)
 
+        case delayedSuccess
+        case delayedFailure(ARTErrorInfo)
+
         func performCallback(_ callback: ARTCallback?) {
             switch self {
             case .success:
                 callback?(nil)
+            case .delayedSuccess:
+                callback?(nil)
             case let .failure(error):
+                sleep(10) // arbitrary
+                callback?(error)
+            case let .delayedFailure(error):
+                sleep(10) // arbitrary
                 callback?(error)
             }
         }
@@ -184,7 +193,7 @@ final class MockRealtimeChannel: NSObject, RealtimeChannelProtocol {
     }
 
     func on(_: @escaping (ARTChannelStateChange) -> Void) -> ARTEventListener {
-        fatalError("Not implemented")
+        ARTEventListener()
     }
 
     func once(_: ARTChannelEvent, callback _: @escaping (ARTChannelStateChange) -> Void) -> ARTEventListener {