Nevermind - I found the answer in the source code (Engine\Source\Programs\UnrealBuildTool\System\RulesCompiler.cs). Running this command line will execute the ATF_Game tests
“%UE4EnginePath%\Build\BatchFiles\RunUAT.bat” BuildCookRun -project=%ProjectPath% -run -RunAutomationTests -unattended -nullrhi -NoP4