The command "/testfor @e[r=5]" doesn't work. It gets very annoying when you can't use that command for map making. It also used to work for older versions. My Device Model is a ARM Chromebook Emulating MCPE
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However, this issue has been closed as a Duplicate of MCPE-22017.
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I think that now the commands would look a little something like this in order to work: "/testfor @e[type=(entity type), r=(#)." If that doesn't work, I don't know what would. I'm just saying it may require you to be a little more specific.