Add more timeline tests

Packages/Timeline/Sources/Timeline/TimelineViewModel.swift

@@ -18,15 +18,7 @@ import SwiftUI
     didSet {
       timelineTask?.cancel()
       timelineTask = Task {
-        if timeline == .latest || timeline == .resume {
+        await handleLatestOrResume(oldValue)
-          if oldValue == .home {
-            await clearHomeCache()
-          }
-          if timeline == .resume, let marker = await fetchMarker() {
-            self.marker = marker
-          }
-          timeline = oldValue
-        }
         
         if oldValue != timeline {
           await reset()
@@ -104,6 +96,18 @@ import SwiftUI
     await datasource.reset()
   }
   
+  private func handleLatestOrResume(_ oldValue: TimelineFilter) async {
+    if timeline == .latest || timeline == .resume {
+      if oldValue == .home {
+        await clearHomeCache()
+      }
+      if timeline == .resume, let marker = await fetchMarker() {
+        self.marker = marker
+      }
+      timeline = oldValue
+    }
+  }
+
   func handleEvent(event: any StreamEvent) async {
     if let event = event as? StreamEventUpdate,
        timeline == .home,

Packages/Timeline/Tests/TimelineTests/TimelineViewModelTests.swift

@@ -21,4 +21,87 @@ final class TimelineViewModelTests: XCTestCase {
     count = await subject.datasource.count()
     XCTAssertTrue(count == 2)
   }
+  
+  func testStreamEventInsertDuplicateStatus() async throws {
+    let subject = TimelineViewModel()
+    let client = Client(server: "localhost")
+    subject.client = client
+    subject.timeline = .home
+    subject.isTimelineVisible = true
+        
+    let isEmpty = await subject.datasource.isEmpty
+    XCTAssertTrue(isEmpty)
+    let status = Status.placeholder()
+    await subject.datasource.append(status)
+    var count = await subject.datasource.count()
+    XCTAssertTrue(count == 1)
+    await subject.handleEvent(event: StreamEventUpdate(status: status))
+    count = await subject.datasource.count()
+    XCTAssertTrue(count == 1)
+  }
+  
+  func testStreamEventRemove() async throws {
+    let subject = TimelineViewModel()
+    let client = Client(server: "localhost")
+    subject.client = client
+    subject.timeline = .home
+    subject.isTimelineVisible = true
+        
+    let isEmpty = await subject.datasource.isEmpty
+    XCTAssertTrue(isEmpty)
+    let status = Status.placeholder()
+    await subject.datasource.append(status)
+    var count = await subject.datasource.count()
+    XCTAssertTrue(count == 1)
+    await subject.handleEvent(event: StreamEventDelete(status: status.id))
+    count = await subject.datasource.count()
+    XCTAssertTrue(count == 0)
+  }
+  
+  func testStreamEventUpdateStatus() async throws {
+    let subject = TimelineViewModel()
+    let client = Client(server: "localhost")
+    subject.client = client
+    subject.timeline = .home
+    subject.isTimelineVisible = true
+        
+    var status = Status.placeholder()
+    let isEmpty = await subject.datasource.isEmpty
+    XCTAssertTrue(isEmpty)
+    await subject.datasource.append(status)
+    var count = await subject.datasource.count()
+    XCTAssertTrue(count == 1)
+    status = .init(id: status.id,
+                   content: .init(stringValue: "test"),
+                   account: status.account,
+                   createdAt: status.createdAt,
+                   editedAt: status.editedAt,
+                   reblog: status.reblog,
+                   mediaAttachments: status.mediaAttachments,
+                   mentions: status.mentions, 
+                   repliesCount: status.repliesCount,
+                   reblogsCount: status.reblogsCount, 
+                   favouritesCount: status.favouritesCount,
+                   card: status.card,
+                   favourited: status.favourited,
+                   reblogged: status.reblogged,
+                   pinned: status.pinned,
+                   bookmarked: status.bookmarked,
+                   emojis: status.emojis,
+                   url: status.url,
+                   application: status.application,
+                   inReplyToId: status.inReplyToId,
+                   inReplyToAccountId: status.inReplyToAccountId,
+                   visibility: status.visibility,
+                   poll: status.poll,
+                   spoilerText: status.spoilerText,
+                   filtered: status.filtered,
+                   sensitive: status.sensitive,
+                   language: status.language)
+    await subject.handleEvent(event: StreamEventStatusUpdate(status: status))
+    let statuses = await subject.datasource.get()
+    count = await subject.datasource.count()
+    XCTAssertTrue(count == 1)
+    XCTAssertTrue(statuses.first?.content.asRawText == "test")
+  }
 }