Perl's MakeMaker assumes that you want to run all of the .t files in the t/ directory in ascii-betical order during `make test` unless you say otherwise. This leads to some interesting naming schemes for test files to get them in the desired order. . Test::Manifest 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.
