Test::Manifest overrides the default behaviour by replacing the test_via_harness target in the Makefile. Instead of running at the t/*.t files in ascii-betical order, it looks in the t/test_manifest file to find out which tests you want to run and the order in which you want to run them. It constructs the right value for MakeMaker to do the right thing.
WWW: http://search.cpan.org/dist/Test-Manifest/
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