Add Functional Tests for ScrollView Component

描述

### Tasks
- [ ] ScrollView should update styling upon fast refresh. 
- [ ] ScrollView should update header upon fast refresh.
- [ ] ScrollView should update footer upon fast refresh.
- [ ] ScrollView should update scroll direction upon fast refresh.
- [ ] ScrollView should scroll vertically when horizontal="false"
- [ ] ScrollView should scroll horizontally when horizontal="true"
- [ ] ScrollView should show end of list when scrollToEnd() is called.
- [ ] ScrollView should show desired location when snapTo* is called.
- [ ] ScrollViews should work when nested.
- [ ] Zoom?

貢獻者指南

技術棧

reactjavascripttypescript

領域

testingfrontend

議題類型

test

難度面向新貢獻者的預計實作難度，1 表示很小改動，5 表示專家級工作。

3

預計時間有經驗貢獻者完成調查、實作、測試並準備 pull request 的粗略時間範圍。

half day

活動狀態議題目前的可參與程度：新鮮、活躍、陳舊、阻塞或等待維護者輸入。

fresh

清晰度議題是否清楚說明預期改動、驗收標準和下一步。

clear

前置要求

basic React Native knowledgefamiliarity with E2E testing

新手友善度1-100 的估計分數，表示該議題對首次貢獻者的友善程度。

65

研究方向

Look at the existing E2E test app in the Fabric directory (likely under `packages/e2e test app`). Find the current ScrollView test file or create a new one following the pattern of other component tests. Each task in the issue corresponds to a specific test case; implement them using the testing framework (likely Jest or WebDriverIO). Ensure tests cover fast refresh scenarios, scroll directions, snapTo, scrollToEnd, and nested ScrollViews. Refer to the ScrollView component's implementation in the native code (C++) for expected behavior, but the tests should be written in JavaScript.