So the answer seems to be that you can just create a reference to the $builder object at any time, either in your test script: 

my $builder = Test::Most->builder;

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or in the debugger ('my' doesn't seem to play well on the debugger command line):

NB for newbies: the DB<x> bit is the debugger prompt, not part of the code. 
DB<x> $builder = Test::Most->builder;

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If you do either of the above, you should find you can subsequently do either of the following in the debugger to print out the current (actually, the latest) test number: 

DB<x> x $builder->{Curr_Test}
DB<x> p $builder->{Curr_Test}

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- or, as I originally sought to do, run the debugger and break after a particular test, e.g. test #20: 

DB<x> w $builder->{Curr_Test} == 20
DB<x> c

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Some Monks seem uncomfortable with the idea of running a test script through a debugger. I can sort of understand what you're saying, folks: a test script is effectively a static debugging service, so why run it through the debugger as well? I have a few answers to this but the simplest are:

"... Perl tests are just Perl code." -- chromatic, in Organizing Perl Test Files
"TIMTOWTDI!" -- TimToady

Feel free to get in touch if you would like a couple more.

In reply to Re^2: Get the number of the current test when debugging a test script by Dumu
in thread Get the number of the current test when debugging a test script by Dumu

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