class PHPUnit_Framework_Constraint_TraversableContains

class PHPUnit_Framework_Constraint_TraversableContains extends PHPUnit_Framework_Constraint {

  /**
   * @var boolean
   */
  protected $checkForObjectIdentity;

  /**
   * @var mixed
   */
  protected $value;

  /**
   * @param  boolean $value
   * @param  mixed   $checkForObjectIdentity
   * @throws PHPUnit_Framework_Exception
   */
  public function __construct($value, $checkForObjectIdentity = TRUE) {
    if (!is_bool($checkForObjectIdentity)) {
      throw PHPUnit_Util_InvalidArgumentHelper::factory(2, 'boolean');
    }
    $this->checkForObjectIdentity = $checkForObjectIdentity;
    $this->value = $value;
  }

  /**
   * Evaluates the constraint for parameter $other. Returns TRUE if the
   * constraint is met, FALSE otherwise.
   *
   * @param mixed $other Value or object to evaluate.
   * @return bool
   */
  protected function matches($other) {
    if ($other instanceof SplObjectStorage) {
      return $other
        ->contains($this->value);
    }
    if (is_object($this->value)) {
      foreach ($other as $element) {
        if ($this->checkForObjectIdentity && $element === $this->value || !$this->checkForObjectIdentity && $element == $this->value) {
          return TRUE;
        }
      }
    }
    else {
      foreach ($other as $element) {
        if ($element == $this->value) {
          return TRUE;
        }
      }
    }
    return FALSE;
  }

  /**
   * Returns a string representation of the constraint.
   *
   * @return string
   */
  public function toString() {
    if (is_string($this->value) && strpos($this->value, "\n") !== FALSE) {
      return 'contains "' . $this->value . '"';
    }
    else {
      return 'contains ' . PHPUnit_Util_Type::export($this->value);
    }
  }

  /**
   * Returns the description of the failure
   *
   * The beginning of failure messages is "Failed asserting that" in most
   * cases. This method should return the second part of that sentence.
   *
   * @param  mixed $other Evaluated value or object.
   * @return string
   */
  protected function failureDescription($other) {
    return sprintf('an %s %s', is_array($other) ? 'array' : 'iterator', $this
      ->toString());
  }

}