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 the directory of the tests and running:
$ phpunit .
PHPUnit 4.1.0 by Sebastian Bergmann.
..............
Time: 52 ms, Memory: 4.50Mb
OK (14 tests, 19 assertions)