最近5.2 preview 1發布了，想說可以開始來升級我的plugin。由於我的plugin有寫一些automation test來幫忙做unit test跟functional test，這樣我就可以省下一些QA的時間。只是在把Plugin升上5.2之後，突然發現之前寫的Automation Test都不會跑了。
在花了一些時間除錯之後，總算發現原因在哪了。結論是：Unreal在5.2之後有做以下幾個更改會影響到這個功能。
第一點：用來過濾來跑哪些Test的FilterPrefix原本是「Filter:」，在5.2的時候改成了「StartsWith:」，因此我們的的AutomationTest要調整成如下的型式：
-ExecCmds="automation List;RunTests StartsWith:Plugin+StartsWith:_Game+StartsWith:Project.Functional Tests;Quit"第二點：有用ScreenShot功能的人會發現不會去比較之前留下來的ground truth image而是要求重新加入，以為整組功能壞光光，這是因為從5.2開始Default RHI變成了D3D12，我們可以在Log中發現下面的訊息：
LogRHI: Using Default RHI: D3D12
LogRHI: Using Highest Feature Level of D3D12: SM5
LogRHI: Loading RHI module D3D12RHI
由於系統會根據目前的FunctionalTest找下面的路徑出來比較：
${PROJECT_ROOT}\Test\Screenshots\UIScreenshotTestMap\BP_FunctionalUIScreenshotTest_BugReport_WBP_DialogueWindow\Windows\D3D11_SM5因此我們只要把所有的Functional Test中的D3D11_SM5改成D3D12_SM5就能抓到需要比較的ground truth image，如下圖：
不過可以想見的是，如果我們把SM5調成SM6的話，那麼相對路徑也會變化，這邊在使用上就要特別注意。
升級完Plugin後，看到Automation Test全通過，嗯，感覺真好。
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