Michelangelo van Dam is back today with the next part of his "Quality Assurance in PHP Projects" series, the third part of his look at PHPUnit, the popular PHP-based unit testing software.

Time for the third part on unit testing with phpunit in my Quality Assurance on PHP projects series. In part one we started writing unit tests for a simple game of tic-tac-toe. In part two we started converting our unit tests into actual code and moved our general unit test code for grids into a Grid focussed unit test. In this part, we're looking at how we can optimize the tests for our players.

He digs deeper into the TicTacToe application and focuses first on the single-player functionality, checking the symbol for the current player (an "X" or "O") and throwing exceptions in the code when things aren't right. He also shows the tests for checking on "more than one player" and "cannot add more than two players" scenarios. Full code for the Player class and tests are included.