Update the timeline media QuickLook modifier. (#3593)

Not hooked up to any flows yet.

UnitTests/Sources/TimelineMediaPreviewViewModelTests.swift

@@ -0,0 +1,56 @@
+//
+// Copyright 2022-2024 New Vector Ltd.
+//
+// SPDX-License-Identifier: AGPL-3.0-only
+// Please see LICENSE in the repository root for full details.
+//
+
+@testable import ElementX
+
+import Combine
+import MatrixRustSDK
+import XCTest
+
+@MainActor
+class TimelineMediaPreviewViewModelTests: XCTestCase {
+    var viewModel: TimelineMediaPreviewViewModel!
+    var context: TimelineMediaPreviewViewModel.Context { viewModel.context }
+    var mediaProvider: MediaProviderMock!
+    
+    func testLoadingItem() async throws {
+        // Given a fresh view model.
+        setupViewModel()
+        XCTAssertFalse(mediaProvider.loadFileFromSourceFilenameCalled)
+        XCTAssertNil(context.viewState.currentItem)
+        
+        // When setting the current item.
+        await viewModel.updateCurrentItem(context.viewState.previewItems[0])
+        
+        // Then the view model should load the item and update its view state.
+        XCTAssertTrue(mediaProvider.loadFileFromSourceFilenameCalled)
+        XCTAssertEqual(context.viewState.currentItem, context.viewState.previewItems[0])
+    }
+    
+    // MARK: - Helpers
+    
+    private func setupViewModel() {
+        let previewItems = [
+            ImageRoomTimelineItem(id: .randomEvent,
+                                  timestamp: .mock,
+                                  isOutgoing: false,
+                                  isEditable: false,
+                                  canBeRepliedTo: true,
+                                  isThreaded: false,
+                                  sender: .init(id: "", displayName: "Sally Sanderson"),
+                                  content: .init(filename: "Amazing image.jpeg",
+                                                 caption: "A caption goes right here.",
+                                                 imageInfo: .mockImage,
+                                                 thumbnailInfo: .mockThumbnail))
+        ]
+        
+        mediaProvider = MediaProviderMock(configuration: .init())
+        viewModel = TimelineMediaPreviewViewModel(previewItems: previewItems,
+                                                  mediaProvider: mediaProvider,
+                                                  userIndicatorController: UserIndicatorControllerMock())
+    }
+}

UnitTests/Sources/VoiceMessageMediaManagerTests.swift

@@ -22,6 +22,8 @@ class VoiceMessageMediaManagerTests: XCTestCase {
     override func setUp() async throws {
         voiceMessageCache = VoiceMessageCacheMock()
         mediaProvider = MediaProviderMock(configuration: .init())
+        mediaProvider.loadFileFromSourceFilenameClosure = nil
+        mediaProvider.loadFileFromSourceFilenameReturnValue = .failure(.failedRetrievingFile)
         voiceMessageMediaManager = VoiceMessageMediaManager(mediaProvider: mediaProvider,
                                                             voiceMessageCache: voiceMessageCache)
     }