Crimping tool basics
For one-off use like test points not used in the final version, the Molex KK series can be useful.  These are cheap, widely available, and crimp tools are also available cheaply.

When making crimps with the hand tool, just assume it won't be the best.  I always follow up by flowing a little solder into the connection.  That has helped a lot in the past.  Again, this is for personally made one-off crimps, not professionally made crimps with the best machines.  Some even say soldering hurts a properly done crimp.

I have done hand-made crimps both with and without soldering, and the soldered ones are by far better.  Without solder, the wire can work its way loose, make intermittent contact, and eventually even come out.  Often a crimp that looks good isn't.  Assume visual inspection without special tools is only for catching the gross obvious stuff, not details like how solidly a wire is really being held.