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From Perl Testing: A Developer's Notebook by chromatic and Ian Langworth, page 40:

There's no technical reason to keep all of the tests for a particular program or module in a single file, so create as many test files as you need, organizing them by features, bugs, modules, or any other criteria.

In my experience, this is sound advice. Dividing a large number of tests into a number of smaller (cohesive) units, is essentially just divide and conquer, the only fundamental technique we have to fight complexity. It also helps ensure that each test runs in isolation, independent of others. To give a specific example, notice that WWW::Mechanize, written by Phalanx leader petdance, contains 3 lib .pm files and 49 .t files.

Apart from all that, a single large .t file makes developing new tests inconvenient because after adding a new test to the .t file, you must run all the other tests (intolerable if the single .t file contains stress tests taking hours to run). Or are you recommending that we don't use the standard Test::Harness/Test::More framework?

In reply to Re^5: Self Testing Modules by eyepopslikeamosquito
in thread Self Testing Modules by Sheol

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