Microsoft Projects, Leveling and the question of how to make two task to be as close as possible

Hi,

During my work with project i come to a situation that i don't understand how to give hint for project that two tasks should be as close as possible (e.g. Read & prepare for feature and its testing – so that tester wont forget everything)

If we use priority but have constrains on the task we can come to situation that the first task is schedule for now and the later is scheduled as per the constrain (E.g. don't start before 2 month from now (the test)) –> we have gap between preparation and testing. you can see sample MPP for it

I didn't find any solution other than playing with the constrain on the first task (which means manual work)

I already open StackOverflow question , so feel free to answer their :)

Thanks (this is not a simple question :))