In situations like that described, the idea is that your test script should *count* the number of records in the file (before running any tests), and then call plan(). Let's say your test script has 10 regular tests, plus it wants to run one test per line in somefile.txt. You'd use something like this: 
  use Test::More;  ## NB *not* no_plan
  open(FOO,"<somefile.txt") or die "Can't open test file: $!"
  my $a = 0;
  $a++ while (<FOO>);
  close(FOO);
  plan tests => 10 + $a;

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In reply to Re^2: No plan "weakens" my Test scripts? by Anonymous Monk
in thread No plan "weakens" my Test scripts? by thor

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