Fixes #978 - Message forwarding support

* Add support for message forwarding

* Move the TimelineProvider within the RoomProxy to avoid it going out of sync and have it automatically register for timeline updates on init

* Implement single selection form button style for message forwarding

* Add searching and filter out the source room from the list

* Fixed emoji screen initial search bar height

* Add view models tests

* Add changelog

* Update strings

* Tweaks following code review

UnitTests/Sources/MessageForwardingScreenViewModelTests.swift

@@ -0,0 +1,69 @@
+//
+// Copyright 2022 New Vector Ltd
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+import Combine
+import XCTest
+
+@testable import ElementX
+
+@MainActor
+class MessageForwardingScreenViewModelTests: XCTestCase {
+    var viewModel: MessageForwardingScreenViewModelProtocol!
+    var context: MessageForwardingScreenViewModelType.Context!
+    var cancellables = Set<AnyCancellable>()
+    
+    override func setUpWithError() throws {
+        viewModel = MessageForwardingScreenViewModel(roomSummaryProvider: MockRoomSummaryProvider(state: .loaded(.mockRooms)), sourceRoomID: "1")
+        context = viewModel.context
+    }
+    
+    func testInitialState() {
+        XCTAssertNil(context.viewState.rooms.first(where: { $0.id == "1" }), "The source room ID shouldn't be shown")
+    }
+    
+    func testRoomSelection() {
+        context.send(viewAction: .selectRoom(roomID: "2"))
+        XCTAssertEqual(context.viewState.selectedRoomID, "2")
+    }
+    
+    func testSearching() {
+        context.searchQuery = "Second"
+        XCTAssertEqual(context.viewState.visibleRooms.count, 1)
+    }
+    
+    func testForwarding() {
+        context.send(viewAction: .selectRoom(roomID: "2"))
+        XCTAssertEqual(context.viewState.selectedRoomID, "2")
+        
+        let expectation = expectation(description: "Wait for confirmation")
+        
+        viewModel.actions
+            .sink { action in
+                switch action {
+                case .send(let roomID):
+                    XCTAssertEqual(roomID, "2")
+                    expectation.fulfill()
+                default:
+                    break
+                }
+            }
+            .store(in: &cancellables)
+        
+        context.send(viewAction: .send)
+        
+        waitForExpectations(timeout: 5.0)
+    }
+}

UnitTests/Sources/RoomDetailsViewModelTests.swift

@@ -221,11 +221,7 @@ class RoomDetailsScreenViewModelTests: XCTestCase {
         await Task.yield()
         XCTAssertTrue(callbackCorrectlyCalled)
     }
-    
-    func testRoomSubscription() async {
-        XCTAssertEqual(roomProxyMock.registerTimelineListenerIfNeededCallsCount, 1)
-    }
-    
+        
     func testCanEditAvatar() async {
         let owner: RoomMemberProxyMock = .mockOwner(allowedStateEvents: [.roomAvatar])
         let mockedMembers: [RoomMemberProxyMock] = [owner, .mockBob, .mockAlice]

UnitTests/Sources/RoomFlowCoordinatorTests.swift

@@ -38,7 +38,8 @@ class RoomFlowCoordinatorTests: XCTestCase {
                                                   roomTimelineControllerFactory: MockRoomTimelineControllerFactory(),
                                                   navigationStackCoordinator: navigationStackCoordinator,
                                                   navigationSplitCoordinator: navigationSplitCoordinator,
-                                                  emojiProvider: EmojiProvider())
+                                                  emojiProvider: EmojiProvider(),
+                                                  userIndicatorController: ServiceLocator.shared.userIndicatorController)
     }
     
     func testRoomPresentation() async {