test: Simplify tests with parent-child relationships

Create object instances with a parent to avoid the need for reparenting
objects manually.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>

test/timer-thread.cpp

@@ -20,7 +20,7 @@ class TimeoutHandler : public Object
 {
 public:
 	TimeoutHandler()
-		: timeout_(false)
+		: timer_(this), timeout_(false)
 	{
 		timer_.timeout.connect(this, &TimeoutHandler::timeoutHandler);
 		timer_.start(100);
@@ -31,12 +31,6 @@ public:
 		return timeout_;
 	}
 
-	void moveToThread(Thread *thread)
-	{
-		Object::moveToThread(thread);
-		timer_.moveToThread(thread);
-	}
-
 private:
 	void timeoutHandler(Timer *timer)
 	{