This is a refactoring of John Gruber’s Title Case program, which also includes a universal test suite containing all the test cases listed by John.

The test suite is provided in the form of a Perl script called test.pl which expects to be passed a command line for invoking a program that performs titlecasing. E.g. to test the provided titlecase itself:

perl test.pl ./titlecase

The program under test should work like John’s: it should read any number of titles from standard input, one title per line, and write the case-corrected titles to standard output in the same form.