Personally, though, someone "testing" me is usually the signal I need to get the hell out of dodge.
And yeah, dropping hints tends to make you look desperate for attention. This isn't to say there isn't room for subtlety in a relationship! There's plenty of things that don't need to be said, and subtlety can be more fun and enjoyable in other areas. Subtlety is half the fun of flirting, after all.
But it is not always appropriate. Especially when you want something that could potentially make you come across as needy. Saying "I want some attention. Call me." does not have the same sort of risk. The desire is there, either way, but in the first the person is waiting on the other person to give it to them. In the second, the person is taking personal action in making what they want, happen.
It's the difference between pointing to a burger king with a sad look on your face and saying "I'm hungry. Can we stop for a burger?"
You don't have to demand, exactly, but you half to meet them halfway. The more work you do, the less needy you sound, since you are showing you don't need the other person to make decisions for you - hence the suggestion of adding a time. They can move it to another time, that's fine, but by starting with one you demonstrate a willingness to do some of the work to get what you want instead of heaping it all on the other person.