BMessageRunner(BMessenger target, const BMessage *message, bigtime_t interval,
			   int32 count)
case 1:	target is invalid, message is valid, interval > 0, count > 0 =>
		InitCheck() should return B_OK. The message runner turns to unusable
		as soon as the first message had to be sent.
		GetInfo() should return B_OK.
case 2:	target is valid, message is NULL, interval > 0, count > 0 =>
		InitCheck() should return B_BAD_VALUE.
		GetInfo() should return B_BAD_VALUE.
case 3:	target is valid, message is valid, interval == 0, count > 0 =>
		R5: InitCheck() should return B_ERROR.
			GetInfo() should return B_BAD_VALUE.
		OBOS: InitCheck() should return B_OK.
			  GetInfo() should return B_OK.
			  A minimal time interval is used (50000).
case 4:	target is valid, message is valid, interval < 0, count > 0 =>
		InitCheck() should return B_OK.
		GetInfo() should return B_OK.
		A minimal time interval is used (50000).
case 5:	target is valid, message is valid, interval == LONGLONG_MAX,
		count > 0 =>
		InitCheck() should return B_OK.
		GetInfo() should return B_OK.
		No message should be delivered.
case 6:	target is valid, message is valid, interval > 0, count == 0 =>
		InitCheck() should return B_ERROR.
		GetInfo() should return B_BAD_VALUE.
case 7:	target is valid, message is valid, interval > 0, count < 0 =>
		InitCheck() should return B_OK.
		GetInfo() should return B_OK.
		Unlimited number of messages.
case 8:	target is valid, message is valid, interval > 0, count > 0 =>
		InitCheck() should return B_OK.
		GetInfo() should return B_OK.
		count messages are sent.

BMessageRunner(BMessenger target, const BMessage *message,
			   bigtime_t interval, int32 count, BMessenger replyTo)
cases 1-8 from first constructor
case 9:	target is valid, message is valid, interval > 0, count > 0,
		replyTo is invalid =>
		InitCheck() should return B_OK.
		GetInfo() should return B_OK.
		count messages are sent. The replies go to the registrar!
case 10:target is valid, message is valid, interval > 0, count > 0,
		replyTo targets a different handler than be_app_messenger =>
		InitCheck() should return B_OK.
		GetInfo() should return B_OK.
		count messages are sent. The replies go to the handler.

status_t SetInterval(bigtime_t interval)
case 1:	object is not properly initialized, interval > 0 =>
		Should return B_BAD_VALUE.
		InitCheck() should return B_ERROR.
		GetInfo() should return B_BAD_VALUE.
case 2:	object was properly initialized, but has already delivered all its
		messages and thus became unusable, interval > 0 =>
		Should return B_BAD_VALUE.
		InitCheck() should return B_OK.
		GetInfo() should return B_BAD_VALUE.
case 3:	object is properly initialized and has still one message to deliver,
		interval > 0 =>
		Should return B_OK.
		InitCheck() should return B_OK.
		GetInfo() should return B_OK and the new interval.
		The timer is reset. The last message arives after the time specified
		by interval has passed.
case 4:	object is properly initialized and has still some messages to deliver,
		interval > 0 =>
		Should return B_OK.
		InitCheck() should return B_OK.
		GetInfo() should return B_OK and the new interval.
		The timer is reset. The messages start to arive after the time
		specified by interval.
case 5:	object is properly initialized and has still an unlimited number of
		messages to deliver, interval > 0 =>
		Should return B_OK.
		InitCheck() should return B_OK.
		GetInfo() should return B_OK and the new interval.
		The timer is reset. The messages start to arive after the time
		specified by interval.
case 6:	object is properly initialized and has still some messages to deliver,
		interval == 0 =>
		Should return B_OK.
		InitCheck() should return B_OK.
		R5: GetInfo() should return B_BAD_VALUE.
			All messages are delivered, but at weird times.
		OBOS: GetInfo() should return B_OK and the minimal interval.
			  The timer is reset. The messages start to arive after the time
			  specified by the minimal interval.
case 7:	object is properly initialized and has still some messages to deliver,
		interval < 0 =>
		Should return B_OK.
		InitCheck() should return B_OK.
		R5: GetInfo() should return B_BAD_VALUE.
			All messages are delivered, but at weird times.
		OBOS: GetInfo() should return B_OK and the minimal interval.
			  The timer is reset. The messages start to arive after the time
			  specified by the minimal interval.

status_t SetCount(int32 count)
case 1:	object is not properly initialized, count > 0 =>
		Should return B_BAD_VALUE.
		InitCheck() should return B_ERROR.
		GetInfo() should return B_BAD_VALUE.
case 2:	object was properly initialized, but has already delivered all its
		messages and thus became unusable, count > 0 =>
		Should return B_BAD_VALUE.
		InitCheck() should return B_OK.
		GetInfo() should return B_BAD_VALUE.
case 3:	object is properly initialized and has still one message to deliver,
		count > 0 =>
		Should return B_OK.
		InitCheck() should return B_OK.
		GetInfo() should return B_OK and the new count.
		The timer is NOT reset. count messages should arrive.
case 4:	object is properly initialized and has still some messages to deliver,
		count > 0 =>
		Should return B_OK.
		InitCheck() should return B_OK.
		GetInfo() should return B_OK and the new count.
		The timer is NOT reset. count messages should arrive.
case 5:	object is properly initialized and has still an unlimited number of
		messages to deliver, count > 0 =>
		Should return B_OK.
		InitCheck() should return B_OK.
		GetInfo() should return B_OK and the new count.
		The timer is NOT reset. count messages should arrive.
case 6:	object is properly initialized and has still some messages to deliver,
		count == 0 =>
		Should return B_OK.
		InitCheck() should return B_OK.
		R5: GetInfo() should return B_OK and count 0!
			The timer is NOT reset and a message arives after the time specified
			by the interval!
		OBOS: GetInfo() should return B_BAD_VALUE.
case 7:	object is properly initialized and has still some messages to deliver,
		count < 0 =>
		Should return B_OK.
		InitCheck() should return B_OK.
		GetInfo() should return B_OK and the new count.
		The timer is NOT reset. Unlimited number of messages.

status_t GetInfo(bigtime_t *interval, int32 *count) const
case 1:	object is properly initialized, interval or count are NULL =>
		Should return B_OK.
		InitCheck() should return B_OK.
case 2:	object is not properly initialized, interval or count are NULL =>
		Should return B_BAD_VALUE.
		InitCheck() should return B_ERROR.
Other cases are side effects of other methods' tests.