Custom Parameter Matchers

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Custom Parameter Matchers

An alternative to using argument capturing is creating custom matchers. All parameter matchers implement the interface Phake_Matchers_IArgumentMatcher. You can create custom implementations of this interface. This is especially useful if you find yourself using a similar capturing pattern over and over again. If I were to rewriting the test above using a customer argument matcher it would look something like this.

Example 5.10. Custom Argument Matcher

<?php
class FiftyTwoCardDeckMatcher implements Phake_Matchers_IArgumentMatcher
{
  public function matches($argument)
  {
    return ($argument instanceof CardCollection
        && $argument->getNumberOfCards() == 52);
  }

  public function __toString()
  {
    return '<object:CardCollection with 52 cards>';
  }
}

class MyBestPokerGameTest extends PHPUnit_Framework_TestCase
{
  public function testDealCards()
  {
    $dealer = Phake::mock('MyPokerDealer');
    $players = Phake::mock('PlayerCollection');

    $cardGame = new MyPokerGame($dealer, $players);

    Phake::verify($dealer)->deal(new 52CardDeckMatcher(), $players);
  }
}
?>

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Phake - PHP Mocking Framework

Custom Parameter Matchers