Beefy Boxes and Bandwidth Generously Provided by pair Networks
XP is just a number
 
PerlMonks  

Comment on

( #3333=superdoc: print w/ replies, xml ) Need Help??

It can protect you when your tests end unexpectedly. For example, let's say you're running 30 tests. At some point, another programmer on your team writes a bad function which calls exit. Your tests might end prematurely and having a test plan catches that. Or maybe you've just updated a CPAN module which calls exit when it shouldn't or finds some other way of terminating your tests early. Again, having a test count will protect you. It's quite possible that a test can terminate early without any tests failing.

Another example is when someone does something like this (assumes Scalar::Util::looks_like_number() has been imported):

foreach my $num ( $point->coordinates ) { ok looks_like_number($num), "... and $num should be a number"; }

If that returns a different number of coordinates from what you expect, having a test plan will catch that. Admittedly, this should actually look something like this:

ok my @coordinates = $point->coordinates, 'coordinates() should return the coordinates'; is scalar @coordinates, 3, '... and it should return the correct numbe +r of them'; foreach my $num ( @coordinates ) { ok looks_like_number($num), "... and each should be a number ($num +)"; }

With that, because you're explicitly counting the number of coordinates, the test plan is not as necessary. However, as with the exit example, a test plan not only helps out when the code is less than perfect, it also helps out when the tests are less than perfect. It's such a small thing to update and when it actually catches a problem, you'll be greatful.

Some people argue, "yeah, but I never write code that stupid so this doesn't apply to me!". That's fine. If updating the test plan is too much work for them, so be it. Me, I know I make mistakes and I expect others to make mistakes. If we didn't make mistakes, we wouldn't need the tests in the first place.

(Trivia quiz: if the above tests were in a CPAN module, how might those tests fail?)

Cheers,
Ovid

New address of my CGI Course.


In reply to Re^2: Toggling test plans with vim by Ovid
in thread Toggling test plans with vim by Ovid

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post; it's "PerlMonks-approved HTML":



  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • Outside of code tags, you may need to use entities for some characters:
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.
  • Log In?
    Username:
    Password:

    What's my password?
    Create A New User
    Chatterbox?
    and the web crawler heard nothing...

    How do I use this? | Other CB clients
    Other Users?
    Others chilling in the Monastery: (10)
    As of 2014-09-02 13:10 GMT
    Sections?
    Information?
    Find Nodes?
    Leftovers?
      Voting Booth?

      My favorite cookbook is:










      Results (22 votes), past polls