If you know the wire is broken, what is the point of testing? Either the break is in the short bit of slack you have to play with, or it is not, and if it is then cutting it back will fix the problem, and if it is not it won't, and the test will not have helped.
Do you mean that the bell has stopped working and you don't know if it is because the cable is broken?
Fair comment mate, I'm just finishing off my house and had some stone fitted around the entrance way. The bell was working and sat ready for cutting back and securing. I foolishly striped the small wire back with my teeth and must have broken one of them. I've now cut back but its still not working.
Shame as I didn't want to use a wireless bell here.
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