To achieve the perfect test harness, 1) supply a patch to Smart::Comments that allows it to be enabled/disabled via an environment variable, (with the default being OFF). [...]

Don't need a patch for this item. You can use if to achieve this. 

use if $ENV{USE_SMART_COMMENTS}, 'Smart::Comments';

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Also, you could omit the use Smart::Comments and do -M. 

perl -MSmart::Comments script.pl

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However, the effect is shallow when using -M. Only the file loaded directly is affected. To test a module, you'd have to execute it as a script. 

perl -MSmart::Comments Module.pm

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In reply to Re^6: Need advice on test output by ikegami
in thread Need advice on test output by Ovid

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