class PHPUnit_Framework_Constraint_ExceptionMessage

class PHPUnit_Framework_Constraint_ExceptionMessage extends PHPUnit_Framework_Constraint {

  /**
   * @var integer
   */
  protected $expectedMessage;

  /**
   * @param string $expected
   */
  public function __construct($expected) {
    $this->expectedMessage = $expected;
  }

  /**
   * Evaluates the constraint for parameter $other. Returns TRUE if the
   * constraint is met, FALSE otherwise.
   *
   * @param  Exception $other
   * @return boolean
   */
  protected function matches($other) {
    return strpos($other
      ->getMessage(), $this->expectedMessage) !== FALSE;
  }

  /**
   * 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("exception message '%s' contains '%s'", $other
      ->getMessage(), $this->expectedMessage);
  }

  /**
   * @return string
   */
  public function toString() {
    return 'exception message contains ';
  }

}