http://www.perlmonks.org?node_id=911976


in reply to Re: Filling in missing values in an array
in thread Filling in missing values in an array

Very informative...this helps me get the hang of tests :)
Though I'm not quite sure how tests 3-5 are supposed to go. If I let the sub execute die "No values found" when that is the case, the app dies instead of showing testresults.

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Re^3: Filling in missing values in an array
by FunkyMonk (Chancellor) on Jun 29, 2011 at 16:37 UTC
    Though I'm not quite sure how tests 3-5 are supposed to go
    Neither was I! So I made it die (a.k.a throws an exception) when the array consists only of NULLs. Garbage in, garbage out, as we used to say. Exceptions prevent the garbage leaking out.

    If you decide it should do something other than die, just change this line:

    die "No values found" if @arr && 0 == grep $_ ne '_', @arr;

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      Yea, but when it dies, the tests are never executed (in my case). That's probably not what's supposed to happen :).
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        If you don't want the code to die, you need to use something to catch the exception. I like Try::Tiny: 
        use Try::Tiny;

my @bad  = try   { fill_in_the_blanks(qw<_ _ _>) } # fails
           catch { print "bad data!\n" };
my @good = try   { fill_in_the_blanks(qw<_ 1 _>) } # succeeds
           catch { print "bad data!\n" };

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        Ah, found out where things went wrong:
        My code dies with a 'No values found' for is_deeply [fill_in_the_blanks(qw< >)], [qw< >], "( )";.
        I thought that throws_ok didn't catch the die but that wasn't the case.
        Seems our approach of the 'empty array'-situation differs :)
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