MCPE testfor in a radius not working correctly

For some reason when I type:

/testfor @p[r=5]

I get the invalid command syntax message. Same goes for when I type:

/testfor @p[x=5,y=5,z=5,r=5]

OR even:

/testfor @e[type=player,r=5]

NOTHING IS WORKING! I really need assistance as I need to work this out for a project I'm working on. Also, I'm pretty sure the command was working in the previous version.

My tablet is a Samsung Galaxy tab A