a better test would be that it checks that `@post` is assigned the result of `Post.find`. Doing it this way means you have to test `set_post` but generally we do not test `private` methods.

Also when writing the test description, we in AV usually start with "should" instead of "does". If it is not too much of a hassle, could you replace it so that it is consistent with the rest of our work? A quick `find & replace` should do the trick =)