A small example of an implementation of a small domain model. The example
consists of three files. The first file Invites contains the implementation of
the domain model. The second file InvitesTest contains a PHPUnit test suite
to only test the Invites model. The third file InvitationCommandHandlerTest contains
a PHPunit test suite to test the available commands.
The files contain comments about what is happening.
The PHPUnit tests can be run by changing to this directory and running:
$ phpunit .
PHPUnit 4.1.0 by Sebastian Bergmann.
..............
Time: 52 ms, Memory: 4.50Mb
OK (14 tests, 19 assertions)