Add more tests

Author: testableapple

StreamChatSwiftUITests/Tests/ChatChannel/ChatChannelViewModel_Tests.swift

@@ -654,6 +654,36 @@ class ChatChannelViewModel_Tests: StreamChatTestCase {
         XCTAssertTrue(viewModel.threadMessageShown)
     }
 
+    func test_chatChannelVM_jumpToMessage_firstMessage_returnsTrue() {
+        // Given
+        let message = ChatMessage.mock()
+        let channelController = makeChannelController(messages: [message])
+        let viewModel = ChatChannelViewModel(channelController: channelController)
+
+        // When
+        let shouldJump = viewModel.jumpToMessage(messageId: message.messageId)
+
+        // Then
+        XCTAssertTrue(shouldJump)
+        XCTAssertNil(viewModel.scrolledId) // First message clears scrolledId
+    }
+
+    func test_chatChannelVM_jumpToMessage_scrolledIdAlreadySet_keepsScrolledId() {
+        // Given
+        let message1 = ChatMessage.mock()
+        let message2 = ChatMessage.mock()
+        let channelController = makeChannelController(messages: [message1, message2])
+        let viewModel = ChatChannelViewModel(channelController: channelController)
+        viewModel.scrolledId = message1.messageId
+
+        // When
+        let shouldJump = viewModel.jumpToMessage(messageId: message2.messageId)
+
+        // Then
+        XCTAssertTrue(shouldJump)
+        XCTAssertEqual(viewModel.scrolledId, message2.messageId) // Should update to message2
+    }
+
     func test_chatChannelVM_crashWhenIndexAccess() {
         // Given
         let message1 = ChatMessage.mock()