Salut à toutes et à tous.

Je découvre doucement PHPUnit, et voici que je me heurte à ce qui me semble être un bug... Voici la classe testée :
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/**
 * Holds several slots.
 * A slot is a cross-template variable, like a block, a title or even an object.
 * 
 * @since 0.1
 */
class SlotHolder {
	/**
	 * Contains slots indexed by names.
	 * 
	 * @var array
	 */
	private $slots = array();
 
	/**
	 * The name of the slot that has been started with
	 * {@link SlotHolder::start()}. Null if no slot is open.
	 * 
	 * @var string
	 */
	private $open = Null;
 
	/**
	 * Adds a slot.
	 * Slot $name must not exist.
	 * 
	 * @param string $name name for this slot
	 * @param mixed $value value for this slot
	 * @since 0.1
	 */
	public function add($name, $value) {
		$this->crashIfExists($name);
 
		$this->slots[$name] = $value;
	}
 
	/**
	 * Returns True if a slot is opened.
	 * 
	 * @return bool
	 * @since 0.1
	 */
	public function isOpen() {
		return $this->open !== Null;
	}
 
	/**
	 * Throws a SlotException if slot $name exists.
	 * 
	 * @throws SlotException
	 * @since 0.1
	 */
	public function crashIfExists($name) {
		if ($this->exist($name)) {
			throw new SlotException(
				'Caught attempt to duplicate slot "' . $name . '"');
		}
	}
 
	/**
	 * If a slot is open, terminates the output buffer and throws a
	 * SlotException.
	 * 
	 * @throws SlotException
	 * @since 0.1
	 */
	public function crashIfOpen() {
		if ($this->isOpen()) {
			$this->terminateBuffer();
			throw new SlotException(
				'Slot "' . $this->open . '" has not been closed.');
		}
	}
 
	/**
	 * Opens a slot. Its contents will be the text printed until a call to
	 * {@link SlotHolder::close()} is issued.
	 * No slot must be opened, and slot $name must not exist.
	 * 
	 * @param string $name the name of this slot
	 * @since 0.1
	 */
	public function open($name) {
		$this->crashIfOpen();
 
		$this->open = $name;
		ob_start();
	}
 
	/**
	 * Stores the previously opened slot. Throws a SlotException if no slot is
	 * open.
	 * 
	 * @throws SlotException
	 * @since 0.1
	 */
	public function close() {
		if (!$this->isOpen()) {
			throw new SlotException('No slot is open.');
		}
 
		$this->add($this->open, ob_get_contents());
		$this->terminateBuffer();
	}
 
	/**
	 * Terminates the buffer and resets $open to Null.
	 * This must not be called unless a buffer has been opened by this template.
	 */
	private function terminateBuffer() {
		ob_end_clean();
		$this->open = Null;
	}
 
	/**
	 * Returns the value of slot $name if it exists,
	 * the default value otherwise.
	 * 
	 * @param string $name
	 * @param mixed $default
	 * @return mixed
	 * @since 0.1
	 */
	public function getOrDefault($name, $default) {
		return array_get_default($this->slots, $name, $default);
	}
 
	/**
	 * Returns the slot $name.
	 * Throws a SlotException if this slot does not exist.
	 * 
	 * @param string $name
	 * @throws SlotException
	 * @return mixed
	 * @since 0.1
	 */
	public function getOrCrash($name) {
		if (array_key_exists($name, $this->slots)) {
			return $this->slots[$name];
		}
		else {
			throw new SlotException(
				'Required slot "' . $name . '" is missing.');
		}
	}
 
	/**
	 * Returns True if slot $name exists, False otherwise.
	 * 
	 * @param string $name
	 * @return bool
	 * @since 0.1
	 */
	public function exist($name) {
		return array_key_exists($name, $this->slots) || $this->open === $name;
	}
}
Et voici le test qui me donne du fil à retordre :
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class SlotHolderTest extends PHPUnit_Framework_TestCase {
	private $h;
 
	public function setUp() {
		$this->h = new SlotHolder();
	}
 
	public function tearDown() {
		if ($this->h->isOpen()) {
			$this->h->close();
		}
	}
 
	/**
	 * Cannot add a slot that has the same name as currently opened slot.
	 * 
	 * @expectedException SlotException
	 */
	public function testAddThrows2() {
		$name = 'slot';
 
		$this->h->open($name);
		$this->h->add($name, '');
	}
}
Et la sortie console :
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1) SlotHolderTest::testAddThrows2
SlotException: Caught attempt to duplicate slot "slot"
 
/home/antoine/zavaee/Web Commons/WebCommons/view.php:64
/home/antoine/zavaee/Web Commons/WebCommons/view.php:41
/home/antoine/zavaee/Web Commons/WebCommons/view.php:111
/home/antoine/zavaee/Web Commons/test/SlotHolderTest.php:21
Le souci, c'est que je demande justement à PHPUnit d'attendre une SlotException. Ça fonctionne bien pour les autres méthodes, mais pas celle-ci.
Au point où j'en suis, je suis quasiment convaincu que ce bug est lié à l'output buffer, mais je n'arrive pas à le résoudre. Quelqu'un a une idée ?