Test::NoTabs lets you check the presence of tabs in your perl code.
It reports its results in standard Test::Simple fashion:

  use Test::NoTabs tests => 1;
  notabs_ok( 'lib/Module.pm', 'Module is tab free');

Homepage:
https://metacpan.org/pod/release/BOBTFISH/Test-NoTabs-1.4/lib/Test/NoTabs.pm
