I’ve got things working with 4.10 for both UE4Editor.exe and RunUAT.bat.
For tests defined with ATF_Editor:
UE4Editor.exe $(ProjectName) -editortest -execcmds=“automation list, automation runtests MyGroup.MyCategory.MyEditorTestName” -testexit=“Automation Queue Empty”
RunUAT.bat BuildCookRun -project=“MyProject” -run -RunAutomationTest=MyGroup.MyCategory.MyEditorTestName -unattended -NOP4 -editortest
For tests defined with ATF_Game, replace -editortest with -game.