exceptions.php

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<?php
/**
 *	base include file for SimpleTest
 *	@package	SimpleTest
 *	@subpackage	UnitTester
 *	@version	$Id: exceptions.php 163 2008-01-14 04:40:16Z matt $
 */

/**#@+
 * Include required SimpleTest files 
 */
require_once dirname(__FILE__) . '/invoker.php';
require_once dirname(__FILE__) . '/expectation.php';
/**#@-*/

/**
 *    Extension that traps exceptions and turns them into
 *    an error message. PHP5 only.
 *	  @package SimpleTest
 *	  @subpackage UnitTester
 */
class SimpleExceptionTrappingInvoker extends SimpleInvokerDecorator {

	/**
	 *    Stores the invoker to be wrapped.
	 *    @param SimpleInvoker $invoker   Test method runner.
	 */
	function SimpleExceptionTrappingInvoker($invoker) {
		$this->SimpleInvokerDecorator($invoker);
	}

	/**
	 *    Invokes a test method whilst trapping expected
	 *    exceptions. Any left over unthrown exceptions
	 *    are then reported as failures.
	 *    @param string $method    Test method to call.
	 */
	function invoke($method) {
		$trap = SimpleTest::getContext()->get('SimpleExceptionTrap');
		$trap->clear();
		try {
			parent::invoke($method);
		} catch (Exception $exception) {
			if (! $trap->isExpected($this->getTestCase(), $exception)) {
				$this->getTestCase()->exception($exception);
			}
			$trap->clear();
			$this->_invoker->getTestCase()->tearDown();
		}
		if ($message = $trap->getOutstanding()) {
			$this->getTestCase()->fail($message);
		}
	}
}

/**
 *    Tests exceptions either by type or the exact
 *    exception. This could be improved to accept
 *    a pattern expectation to test the error
 *    message, but that will have to come later.
 *	  @package SimpleTest
 *	  @subpackage UnitTester
 */
class ExceptionExpectation extends SimpleExpectation {
	private $expected;

	/**
	 *    Sets up the conditions to test against.
	 *    If the expected value is a string, then
	 *    it will act as a test of the class name.
	 *    An exception as the comparison will
	 *    trigger an identical match. Writing this
	 *    down now makes it look doubly dumb. I hope
	 *    come up with a better scheme later.
	 *    @param mixed $expected   A class name or an actual
	 *                             exception to compare with.
	 *    @param string $message   Message to display.
	 */
	function __construct($expected, $message = '%s') {
		$this->expected = $expected;
		parent::__construct($message);
	}

	/**
	 *    Carry out the test.
	 *    @param Exception $compare    Value to check.
	 *    @return boolean              True if matched.
	 */
	function test($compare) {
		if (is_string($this->expected)) {
			return ($compare instanceof $this->expected);
		}
		if (get_class($compare) != get_class($this->expected)) {
			return false;
		}
		return $compare->getMessage() == $this->expected->getMessage();
	}

	/**
	 *    Create the message to display describing the test.
	 *    @param Exception $compare     Exception to match.
	 *    @return string                Final message.
	 */
	function testMessage($compare) {
		if (is_string($this->expected)) {
			return "Exception [" . $this->describeException($compare) .
					"] should be type [" . $this->expected . "]";
		}
		return "Exception [" . $this->describeException($compare) .
				"] should match [" .
				$this->describeException($this->expected) . "]";
	}

	/**
	 *    Summary of an Exception object.
	 *    @param Exception $compare     Exception to describe.
	 *    @return string                Text description.
	 */
	protected function describeException($exception) {
		return get_class($exception) . ": " . $exception->getMessage();
	}
}

/**
 *    Stores expected exceptions for when they
 *    get thrown. Saves the irritating try...catch
 *    block.
 *	  @package	SimpleTest
 *	  @subpackage	UnitTester
 */
class SimpleExceptionTrap {
	private $expected;
	private $message;

	/**
	 *    Clears down the queue ready for action.
	 */
	function __construct() {
		$this->clear();
	}

	/**
	 *    Sets up an expectation of an exception.
	 *    This has the effect of intercepting an
	 *    exception that matches.
	 *    @param SimpleExpectation $expected    Expected exception to match.
	 *    @param string $message                Message to display.
	 *    @access public
	 */
	function expectException($expected = false, $message = '%s') {
		if ($expected === false) {
			$expected = new AnythingExpectation();
		}
		if (! SimpleExpectation::isExpectation($expected)) {
			$expected = new ExceptionExpectation($expected);
		}
		$this->expected = $expected;
		$this->message = $message;
	}

	/**
	 *    Compares the expected exception with any
	 *    in the queue. Issues a pass or fail and
	 *    returns the state of the test.
	 *    @param SimpleTestCase $test    Test case to send messages to.
	 *    @param Exception $exception    Exception to compare.
	 *    @return boolean                False on no match.
	 */
	function isExpected($test, $exception) {
		if ($this->expected) {
			return $test->assert($this->expected, $exception, $this->message);
		}
		return false;
	}

	/**
	 *    Tests for any left over exception.
	 *    @return string/false     The failure message or false if none.
	 */
	function getOutstanding() {
		return sprintf($this->message, 'Failed to trap exception');
	}

	/**
	 *    Discards the contents of the error queue.
	 */
	function clear() {
		$this->expected = false;
		$this->message = false;
	}
}
?>