c# how to unit test this kindof method

Question

public void getPlayer()
{
combobox.Item.Add("Kobe");
}

i mean it doesnt return anything. and im just wondering how to deal with a method without return type.

Answer 1

do you mean: how can a void method be useful in programming?

Answer 2

@GT i mean TDD. Test Driven Design. How to unit test a method like this.