Handle threaded pinned events (#4704)

* implemented focussing a threaded event through the banner tap

* view in timeline implementation for threaded events

* added a test and improved the existing one

* pr suggestions

* put the logic for fetching the event in the view models

ElementX/Sources/FlowCoordinators/PinnedEventsTimelineFlowCoordinator.swift

@@ -13,7 +13,7 @@ enum PinnedEventsTimelineFlowCoordinatorAction {
     case finished
     case displayUser(userID: String)
     case forwardedMessageToRoom(roomID: String)
-    case displayRoomScreenWithFocussedPin(eventID: String)
+    case displayRoomScreenWithFocussedPin(eventID: String, threadRootEventID: String?)
 }
 
 class PinnedEventsTimelineFlowCoordinator: FlowCoordinatorProtocol {
@@ -87,8 +87,8 @@ class PinnedEventsTimelineFlowCoordinator: FlowCoordinatorProtocol {
                     presentMapNavigator(geoURI: geoURI, description: description, timelineController: timelineController)
                 case .displayMessageForwarding(let forwardingItem):
                     presentMessageForwarding(with: forwardingItem)
-                case .displayRoomScreenWithFocussedPin(let eventID):
+                case .displayRoomScreenWithFocussedPin(let eventID, let threadRootEventID):
-                    actionsSubject.send(.displayRoomScreenWithFocussedPin(eventID: eventID))
+                    actionsSubject.send(.displayRoomScreenWithFocussedPin(eventID: eventID, threadRootEventID: threadRootEventID))
                 }
             }
             .store(in: &cancellables)

ElementX/Sources/FlowCoordinators/RoomFlowCoordinator.swift

@@ -165,10 +165,15 @@ class RoomFlowCoordinator: FlowCoordinatorProtocol {
             }
         case .thread(let roomID, let threadRootEventID, let focusEventID):
             Task {
+                let focusEvent: FocusEvent? = if let focusEventID {
+                    .init(eventID: focusEventID, shouldSetPin: false)
+                } else {
+                    nil
+                }
                 await handleRoomRoute(roomID: roomID,
                                       via: [],
                                       presentationAction: .thread(rootEventID: threadRootEventID,
-                                                                  focusEventID: focusEventID),
+                                                                  focusEvent: focusEvent),
                                       animated: animated)
             }
         case .event(let eventID, let roomID, let via):
@@ -304,7 +309,10 @@ class RoomFlowCoordinator: FlowCoordinatorProtocol {
                 switch await roomProxy.loadOrFetchEventDetails(for: focusEvent.eventID) {
                 case .success(let event):
                     if flowParameters.appSettings.threadsEnabled, let threadRootEventID = event.threadRootEventId() {
-                        stateMachine.tryEvent(.presentRoom(presentationAction: .thread(rootEventID: threadRootEventID, focusEventID: focusEvent.eventID)), userInfo: EventUserInfo(animated: animated))
+                        stateMachine.tryEvent(.presentRoom(presentationAction: .thread(rootEventID: threadRootEventID,
+                                                                                       focusEvent: .init(eventID: focusEvent.eventID,
+                                                                                                         shouldSetPin: focusEvent.shouldSetPin))),
+                                              userInfo: EventUserInfo(animated: animated))
                     } else {
                         stateMachine.tryEvent(.presentRoom(presentationAction: presentationAction), userInfo: EventUserInfo(animated: animated))
                     }
@@ -570,9 +578,15 @@ class RoomFlowCoordinator: FlowCoordinatorProtocol {
                                           userInfo: EventUserInfo(animated: animated, timelineController: timelineController))
                 case .share(.text(_, let text)):
                     roomScreenCoordinator?.shareText(text)
-                case .thread(let rootEventID, let focusEventID):
+                case .thread(let rootEventID, let focusEvent):
-                    roomScreenCoordinator?.focusOnEvent(.init(eventID: rootEventID, shouldSetPin: false))
+                    if let focusEvent, let roomScreenCoordinator {
-                    stateMachine.tryEvent(.presentThread(threadRootEventID: rootEventID, focusEventID: focusEventID))
+                        roomScreenCoordinator.focusOnEvent(.init(eventID: rootEventID, shouldSetPin: false))
+                        // Since the root is not the message we want to show in the pinned banner, but the actual event
+                        if focusEvent.shouldSetPin {
+                            roomScreenCoordinator.setSelectedPin(eventID: focusEvent.eventID)
+                        }
+                    }
+                    stateMachine.tryEvent(.presentThread(threadRootEventID: rootEventID, focusEventID: focusEvent?.eventID))
                 case .none:
                     break
                 }
@@ -607,8 +621,8 @@ class RoomFlowCoordinator: FlowCoordinatorProtocol {
         case .share(.mediaFiles(_, let mediaFiles)):
             stateMachine.tryEvent(.presentMediaUploadPreview(mediaURLs: mediaFiles.map(\.url)),
                                   userInfo: EventUserInfo(animated: animated, timelineController: timelineController))
-        case .thread(let rootEventID, let focusEventID):
+        case .thread(let rootEventID, let focusEvent):
-            stateMachine.tryEvent(.presentThread(threadRootEventID: rootEventID, focusEventID: focusEventID))
+            stateMachine.tryEvent(.presentThread(threadRootEventID: rootEventID, focusEventID: focusEvent?.eventID))
         case .share(.text), .eventFocus:
             break // These are both handled in the coordinator's init.
         case .none:
@@ -693,11 +707,8 @@ class RoomFlowCoordinator: FlowCoordinatorProtocol {
                                                                      sendHandle: sendHandle))
                 case .presentKnockRequestsList:
                     stateMachine.tryEvent(.presentKnockRequestsListScreen)
-                case .presentThread(let itemID):
+                case .presentThread(let threadRootEventID, let focussedEventID):
-                    guard let threadRootEventID = itemID.eventID else {
+                    stateMachine.tryEvent(.presentThread(threadRootEventID: threadRootEventID, focusEventID: focussedEventID))
-                        fatalError("A thread root has always an eventID")
-                    }
-                    stateMachine.tryEvent(.presentThread(threadRootEventID: threadRootEventID, focusEventID: nil))
                 case .presentRoom(let roomID, let via):
                     stateMachine.tryEvent(.startChildFlow(roomID: roomID,
                                                           via: via,
@@ -1478,9 +1489,13 @@ class RoomFlowCoordinator: FlowCoordinatorProtocol {
             case .forwardedMessageToRoom(let roomID):
                 navigationStackCoordinator.setSheetCoordinator(nil)
                 stateMachine.tryEvent(.startChildFlow(roomID: roomID, via: [], entryPoint: .room))
-            case .displayRoomScreenWithFocussedPin(let eventID):
+            case .displayRoomScreenWithFocussedPin(let eventID, let threadRootEventID):
                 navigationStackCoordinator.setSheetCoordinator(nil)
-                stateMachine.tryEvent(.presentRoom(presentationAction: .eventFocus(.init(eventID: eventID, shouldSetPin: true))))
+                if let threadRootEventID {
+                    stateMachine.tryEvent(.presentRoom(presentationAction: .thread(rootEventID: threadRootEventID, focusEvent: .init(eventID: eventID, shouldSetPin: true))))
+                } else {
+                    stateMachine.tryEvent(.presentRoom(presentationAction: .eventFocus(.init(eventID: eventID, shouldSetPin: true))))
+                }
             }
         }
         .store(in: &cancellables)

ElementX/Sources/FlowCoordinators/RoomFlowCoordinatorStateMachine.swift

@@ -25,18 +25,18 @@ extension RoomFlowCoordinator {
     enum PresentationAction: Hashable {
         case eventFocus(FocusEvent)
         case share(ShareExtensionPayload)
-        case thread(rootEventID: String, focusEventID: String?)
+        case thread(rootEventID: String, focusEvent: FocusEvent?)
         
         var focusedEvent: FocusEvent? {
             switch self {
             case .eventFocus(let focusEvent):
                 focusEvent
-            case .thread(let rootEventID, let focusEventID):
+            case .thread(let rootEventID, let focusEvent):
                 // Since this enum is for the room and not the threaded timeline,
                 // we will focus the thread root event id, and not the event id itself
                 // which will be done at the thread presentation level
-                if focusEventID != nil {
+                if let focusEvent {
-                    .init(eventID: rootEventID, shouldSetPin: false)
+                    .init(eventID: rootEventID, shouldSetPin: focusEvent.shouldSetPin)
                 } else {
                     nil
                 }

ElementX/Sources/Screens/PinnedEventsTimelineScreen/PinnedEventsTimelineScreenCoordinator.swift

@@ -28,11 +28,10 @@ enum PinnedEventsTimelineScreenCoordinatorAction {
     case displayUser(userID: String)
     case presentLocationViewer(geoURI: GeoURI, description: String?)
     case displayMessageForwarding(forwardingItem: MessageForwardingItem)
-    case displayRoomScreenWithFocussedPin(eventID: String)
+    case displayRoomScreenWithFocussedPin(eventID: String, threadRootEventID: String?)
 }
 
 final class PinnedEventsTimelineScreenCoordinator: CoordinatorProtocol {
-    private let parameters: PinnedEventsTimelineScreenCoordinatorParameters
     private let viewModel: PinnedEventsTimelineScreenViewModelProtocol
     private let timelineViewModel: TimelineViewModelProtocol
     
@@ -44,9 +43,10 @@ final class PinnedEventsTimelineScreenCoordinator: CoordinatorProtocol {
     }
     
     init(parameters: PinnedEventsTimelineScreenCoordinatorParameters) {
-        self.parameters = parameters
+        viewModel = PinnedEventsTimelineScreenViewModel(roomProxy: parameters.roomProxy,
-        
+                                                        userIndicatorController: parameters.userIndicatorController,
-        viewModel = PinnedEventsTimelineScreenViewModel(analyticsService: parameters.analytics)
+                                                        appSettings: parameters.appSettings,
+                                                        analyticsService: parameters.analytics)
         timelineViewModel = TimelineViewModel(roomProxy: parameters.roomProxy,
                                               timelineController: parameters.timelineController,
                                               userSession: parameters.userSession,
@@ -68,9 +68,8 @@ final class PinnedEventsTimelineScreenCoordinator: CoordinatorProtocol {
             switch action {
             case .displayMessageForwarding(let forwardingItem):
                 actionsSubject.send(.displayMessageForwarding(forwardingItem: forwardingItem))
-            case .viewInRoomTimeline(let itemID):
+            case .viewInRoomTimeline(let eventID, let threadRootEventID):
-                guard let eventID = itemID.eventID else { fatalError("A pinned event must have an event ID.") }
+                actionsSubject.send(.displayRoomScreenWithFocussedPin(eventID: eventID, threadRootEventID: threadRootEventID))
-                actionsSubject.send(.displayRoomScreenWithFocussedPin(eventID: eventID))
             case .dismiss:
                 self.actionsSubject.send(.dismiss)
             }
@@ -90,8 +89,8 @@ final class PinnedEventsTimelineScreenCoordinator: CoordinatorProtocol {
                 viewModel.displayMediaPreview(mediaPreviewViewModel)
             case .displayLocation(_, let geoURI, let description):
                 actionsSubject.send(.presentLocationViewer(geoURI: geoURI, description: description))
-            case .viewInRoomTimeline(let eventID):
+            case .viewInRoomTimeline(let eventID, let threadRootEventID):
-                actionsSubject.send(.displayRoomScreenWithFocussedPin(eventID: eventID))
+                actionsSubject.send(.displayRoomScreenWithFocussedPin(eventID: eventID, threadRootEventID: threadRootEventID))
             // These other actions will not be handled in this view
             case .displayEmojiPicker, .displayReportContent, .displayCameraPicker, .displayMediaPicker,
                  .displayDocumentPicker, .displayLocationPicker, .displayPollForm, .displayMediaUploadPreviewScreen,

ElementX/Sources/Screens/PinnedEventsTimelineScreen/PinnedEventsTimelineScreenModels.swift

@@ -9,7 +9,7 @@
 import Foundation
 
 enum PinnedEventsTimelineScreenViewModelAction {
-    case viewInRoomTimeline(itemID: TimelineItemIdentifier)
+    case viewInRoomTimeline(eventID: String, threadRootEventID: String?)
     case displayMessageForwarding(MessageForwardingItem)
     case dismiss
 }

ElementX/Sources/Screens/PinnedEventsTimelineScreen/PinnedEventsTimelineScreenViewModel.swift

@@ -12,6 +12,9 @@ import SwiftUI
 typealias PinnedEventsTimelineScreenViewModelType = StateStoreViewModel<PinnedEventsTimelineScreenViewState, PinnedEventsTimelineScreenViewAction>
 
 class PinnedEventsTimelineScreenViewModel: PinnedEventsTimelineScreenViewModelType, PinnedEventsTimelineScreenViewModelProtocol {
+    private let roomProxy: JoinedRoomProxyProtocol
+    private let userIndicatorController: UserIndicatorControllerProtocol
+    private let appSettings: AppSettings
     private let analyticsService: AnalyticsService
     
     private let actionsSubject: PassthroughSubject<PinnedEventsTimelineScreenViewModelAction, Never> = .init()
@@ -19,7 +22,13 @@ class PinnedEventsTimelineScreenViewModel: PinnedEventsTimelineScreenViewModelTy
         actionsSubject.eraseToAnyPublisher()
     }
     
-    init(analyticsService: AnalyticsService) {
+    init(roomProxy: JoinedRoomProxyProtocol,
+         userIndicatorController: UserIndicatorControllerProtocol,
+         appSettings: AppSettings,
+         analyticsService: AnalyticsService) {
+        self.roomProxy = roomProxy
+        self.userIndicatorController = userIndicatorController
+        self.appSettings = appSettings
         self.analyticsService = analyticsService
         super.init(initialViewState: PinnedEventsTimelineScreenViewState())
     }
@@ -52,7 +61,10 @@ class PinnedEventsTimelineScreenViewModel: PinnedEventsTimelineScreenViewModelTy
                     self.actionsSubject.send(.displayMessageForwarding(forwardingItem))
                 }
             case .viewInRoomTimeline(let itemID):
-                actionsSubject.send(.viewInRoomTimeline(itemID: itemID))
+                guard let eventID = itemID.eventID else {
+                    return
+                }
+                Task { await self.viewInRoomTimeline(eventID: eventID) }
             case .dismiss:
                 state.bindings.mediaPreviewViewModel = nil
             }
@@ -61,4 +73,18 @@ class PinnedEventsTimelineScreenViewModel: PinnedEventsTimelineScreenViewModelTy
         
         state.bindings.mediaPreviewViewModel = mediaPreviewViewModel
     }
+    
+    private func viewInRoomTimeline(eventID: String) async {
+        switch await roomProxy.loadOrFetchEventDetails(for: eventID) {
+        case .success(let event):
+            let threadRootEventID: String? = if appSettings.threadsEnabled {
+                event.threadRootEventId()
+            } else {
+                nil
+            }
+            actionsSubject.send(.viewInRoomTimeline(eventID: eventID, threadRootEventID: threadRootEventID))
+        case .failure:
+            userIndicatorController.submitIndicator(.init(title: L10n.errorUnknown))
+        }
+    }
 }

ElementX/Sources/Screens/PinnedEventsTimelineScreen/View/PinnedEventsTimelineScreen.swift

@@ -66,7 +66,11 @@ struct PinnedEventsTimelineScreen: View {
 // MARK: - Previews
 
 struct PinnedEventsTimelineScreen_Previews: PreviewProvider, TestablePreview {
-    static let viewModel = PinnedEventsTimelineScreenViewModel(analyticsService: ServiceLocator.shared.analytics)
+    static let viewModel = PinnedEventsTimelineScreenViewModel(roomProxy: JoinedRoomProxyMock(.init()),
+                                                               userIndicatorController: UserIndicatorControllerMock(),
+                                                               appSettings: AppSettings(),
+                                                               analyticsService: ServiceLocator.shared.analytics)
+    
     static let emptyTimelineViewModel: TimelineViewModel = {
         let timelineController = MockTimelineController(timelineKind: .pinned)
         timelineController.timelineItems = []

ElementX/Sources/Screens/RoomScreen/RoomScreenCoordinator.swift

@@ -47,7 +47,7 @@ enum RoomScreenCoordinatorAction {
     case presentPinnedEventsTimeline
     case presentResolveSendFailure(failure: TimelineItemSendFailure.VerifiedUser, sendHandle: SendHandleProxy)
     case presentKnockRequestsList
-    case presentThread(itemID: TimelineItemIdentifier)
+    case presentThread(threadRootEventID: String, focussedEventID: String?)
     case presentRoom(roomID: String, via: [String])
 }
 
@@ -142,7 +142,10 @@ final class RoomScreenCoordinator: CoordinatorProtocol {
                 case .displayResolveSendFailure(let failure, let sendHandle):
                     actionsSubject.send(.presentResolveSendFailure(failure: failure, sendHandle: sendHandle))
                 case .displayThread(let itemID):
-                    actionsSubject.send(.presentThread(itemID: itemID))
+                    guard let eventID = itemID.eventID else {
+                        fatalError("A thread root has always an eventID")
+                    }
+                    actionsSubject.send(.presentThread(threadRootEventID: eventID, focussedEventID: nil))
                 case .composer(let action):
                     composerViewModel.process(timelineAction: action)
                 case .hasScrolled(direction: let direction):
@@ -184,6 +187,8 @@ final class RoomScreenCoordinator: CoordinatorProtocol {
                     actionsSubject.send(.presentRoom(roomID: roomID, via: via))
                 case .displayMessageForwarding(let forwardingItem):
                     actionsSubject.send(.presentMessageForwarding(forwardingItem: forwardingItem))
+                case .displayThread(let threadRootEventID, let focussedEventID):
+                    actionsSubject.send(.presentThread(threadRootEventID: threadRootEventID, focussedEventID: focussedEventID))
                 }
             }
             .store(in: &cancellables)
@@ -201,6 +206,11 @@ final class RoomScreenCoordinator: CoordinatorProtocol {
         Task { await timelineViewModel.focusOnEvent(eventID: eventID) }
     }
     
+    /// Sets the banner to selection to a specific event ID, even if not visible in the main timeline (like a threaded event).
+    func setSelectedPin(eventID: String) {
+        roomViewModel.setSelectedPinnedEventID(eventID)
+    }
+    
     func shareText(_ string: String) {
         composerViewModel.process(timelineAction: .setMode(mode: .default)) // Make sure we're not e.g. replying.
         composerViewModel.process(timelineAction: .setText(plainText: string, htmlText: nil))

ElementX/Sources/Screens/RoomScreen/RoomScreenModels.swift

@@ -11,6 +11,7 @@ import OrderedCollections
 
 enum RoomScreenViewModelAction: Equatable {
     case focusEvent(eventID: String)
+    case displayThread(threadRootEventID: String, focussedEventID: String)
     case displayPinnedEventsTimeline
     case displayRoomDetails
     case displayCall

ElementX/Sources/Screens/RoomScreen/RoomScreenViewModel.swift

@@ -85,11 +85,7 @@ class RoomScreenViewModel: RoomScreenViewModelType, RoomScreenViewModelProtocol
     override func process(viewAction: RoomScreenViewAction) {
         switch viewAction {
         case .tappedPinnedEventsBanner:
-            analyticsService.trackInteraction(name: .PinnedMessageBannerClick)
+            handleTappedPinnedEventsBanner()
-            if let eventID = state.pinnedEventsBannerState.selectedPinnedEventID {
-                actionsSubject.send(.focusEvent(eventID: eventID))
-            }
-            state.pinnedEventsBannerState.previousPin()
         case .viewAllPins:
             analyticsService.trackInteraction(name: .PinnedMessageBannerViewAllButton)
             actionsSubject.send(.displayPinnedEventsTimeline)
@@ -402,6 +398,27 @@ class RoomScreenViewModel: RoomScreenViewModelType, RoomScreenViewModelProtocol
         state.handledEventIDs.subtract(failedIDs)
     }
     
+    private func handleTappedPinnedEventsBanner() {
+        analyticsService.trackInteraction(name: .PinnedMessageBannerClick)
+        if let eventID = state.pinnedEventsBannerState.selectedPinnedEventID {
+            Task {
+                switch await roomProxy.loadOrFetchEventDetails(for: eventID) {
+                case .success(let event):
+                    if appSettings.threadsEnabled,
+                       let threadRootEventID = event.threadRootEventId() {
+                        actionsSubject.send(.focusEvent(eventID: threadRootEventID))
+                        actionsSubject.send(.displayThread(threadRootEventID: threadRootEventID, focussedEventID: eventID))
+                    } else {
+                        actionsSubject.send(.focusEvent(eventID: eventID))
+                    }
+                case .failure:
+                    userIndicatorController.submitIndicator(.init(title: L10n.errorUnknown))
+                }
+            }
+        }
+        state.pinnedEventsBannerState.previousPin()
+    }
+    
     // MARK: Loading indicators
     
     private static let loadingIndicatorIdentifier = "\(RoomScreenViewModel.self)-Loading"

ElementX/Sources/Screens/Timeline/TimelineModels.swift

@@ -28,7 +28,7 @@ enum TimelineViewModelAction {
     case displayThread(itemID: TimelineItemIdentifier)
     case composer(action: TimelineComposerAction)
     case hasScrolled(direction: ScrollDirection)
-    case viewInRoomTimeline(eventID: String)
+    case viewInRoomTimeline(eventID: String, threadRootEventID: String?)
     case displayRoom(roomID: String, via: [String])
     case displayMediaDetails(item: EventBasedMessageTimelineItemProtocol)
 }

ElementX/Sources/Screens/Timeline/TimelineViewModel.swift

@@ -495,7 +495,7 @@ class TimelineViewModel: TimelineViewModelType, TimelineViewModelProtocol {
                 case .showDebugInfo(let debugInfo):
                     state.bindings.debugInfo = debugInfo
                 case .viewInRoomTimeline(let eventID):
-                    actionsSubject.send(.viewInRoomTimeline(eventID: eventID))
+                    Task { await self.viewInRoomTimeline(eventID: eventID) }
                 case .displayThread(let itemID):
                     actionsSubject.send(.displayThread(itemID: itemID))
                 }
@@ -503,6 +503,20 @@ class TimelineViewModel: TimelineViewModelType, TimelineViewModelProtocol {
             .store(in: &cancellables)
     }
     
+    func viewInRoomTimeline(eventID: String) async {
+        switch await roomProxy.loadOrFetchEventDetails(for: eventID) {
+        case .success(let event):
+            let threadRootEventID: String? = if appSettings.threadsEnabled {
+                event.threadRootEventId()
+            } else {
+                nil
+            }
+            actionsSubject.send(.viewInRoomTimeline(eventID: eventID, threadRootEventID: threadRootEventID))
+        case .failure:
+            userIndicatorController.submitIndicator(.init(title: L10n.errorUnknown))
+        }
+    }
+    
     private func setupAppSettingsSubscriptions() {
         appSettings.$sharePresence
             .weakAssign(to: \.state.showReadReceipts, on: self)

UnitTests/Sources/RoomScreenViewModelTests.swift

@@ -22,6 +22,7 @@ class RoomScreenViewModelTests: XCTestCase {
     
     override func tearDown() {
         viewModel = nil
+        AppSettings.resetAllSettings()
     }
     
     func testPinnedEventsBanner() async throws {
@@ -109,6 +110,7 @@ class RoomScreenViewModelTests: XCTestCase {
     
     func testPinnedEventsBannerSelection() async throws {
         let roomProxyMock = JoinedRoomProxyMock(.init())
+        roomProxyMock.loadOrFetchEventDetailsForReturnValue = .success(TimelineEventSDKMock())
         // setup a way to inject the mock of the pinned events timeline
         let pinnedTimelineMock = TimelineProxyMock()
         let pinnedTimelineItemProviderMock = TimelineItemProviderMock()
@@ -160,6 +162,67 @@ class RoomScreenViewModelTests: XCTestCase {
         try await deferred.fulfill()
     }
     
+    func testPinnedEventsBannerThreadedSelection() async throws {
+        ServiceLocator.shared.settings.threadsEnabled = true
+        
+        let roomProxyMock = JoinedRoomProxyMock(.init())
+        let eventMock = TimelineEventSDKMock()
+        eventMock.threadRootEventIdReturnValue = "thread"
+        roomProxyMock.loadOrFetchEventDetailsForReturnValue = .success(eventMock)
+        
+        // setup a way to inject the mock of the pinned events timeline
+        let pinnedTimelineMock = TimelineProxyMock()
+        let pinnedTimelineItemProviderMock = TimelineItemProviderMock()
+        pinnedTimelineMock.timelineItemProvider = pinnedTimelineItemProviderMock
+        pinnedTimelineItemProviderMock.underlyingUpdatePublisher = Empty<([TimelineItemProxy], PaginationState), Never>().eraseToAnyPublisher()
+        pinnedTimelineItemProviderMock.itemProxies = [.event(.init(item: EventTimelineItem(configuration: .init(eventID: "test1")), uniqueID: .init("1"))),
+                                                      .event(.init(item: EventTimelineItem(configuration: .init(eventID: "test2")), uniqueID: .init("2"))),
+                                                      .event(.init(item: EventTimelineItem(configuration: .init(eventID: "test3")), uniqueID: .init("3")))]
+        roomProxyMock.pinnedEventsTimelineReturnValue = .success(pinnedTimelineMock)
+        
+        let viewModel = RoomScreenViewModel(userSession: UserSessionMock(.init()),
+                                            roomProxy: roomProxyMock,
+                                            initialSelectedPinnedEventID: "test1",
+                                            ongoingCallRoomIDPublisher: .init(.init(nil)),
+                                            appSettings: ServiceLocator.shared.settings,
+                                            appHooks: AppHooks(),
+                                            analyticsService: ServiceLocator.shared.analytics,
+                                            userIndicatorController: ServiceLocator.shared.userIndicatorController)
+        self.viewModel = viewModel
+        
+        // check if the banner is now in a loaded state and is showing the counter
+        var deferred = deferFulfillment(viewModel.context.$viewState) { viewState in
+            !viewState.pinnedEventsBannerState.isLoading
+        }
+        try await deferred.fulfill()
+        XCTAssertEqual(viewModel.context.viewState.pinnedEventsBannerState.count, 3)
+        XCTAssertTrue(viewModel.context.viewState.shouldShowPinnedEventsBanner)
+        // And that is actually displaying the `initialSelectedPinEventID` which is gthe first one in the list
+        XCTAssertEqual(viewModel.context.viewState.pinnedEventsBannerState.selectedPinnedIndex, 0)
+        
+        // check if the banner scrolls when tapping the previous pin
+        deferred = deferFulfillment(viewModel.context.$viewState) { viewState in
+            viewState.pinnedEventsBannerState.selectedPinnedIndex == 2
+        }
+        let deferredAction1 = deferFulfillment(viewModel.actions) { action in
+            if case let .focusEvent(threadRootEventID) = action {
+                return threadRootEventID == "thread"
+            }
+            return false
+        }
+        let deferredAction2 = deferFulfillment(viewModel.actions) { action in
+            if case let .displayThread(threadRootEventID, focussedEventID) = action {
+                return threadRootEventID == "thread" && focussedEventID == "test1"
+            }
+            return false
+        }
+        
+        viewModel.context.send(viewAction: .tappedPinnedEventsBanner)
+        try await deferred.fulfill()
+        try await deferredAction1.fulfill()
+        try await deferredAction2.fulfill()
+    }
+    
     func testRoomInfoUpdate() async throws {
         var configuration = JoinedRoomProxyMockConfiguration(id: "TestID", name: "StartingName", avatarURL: nil, hasOngoingCall: false)
         let roomProxyMock = JoinedRoomProxyMock(configuration)