Of course we need.As we know,love is a thing that is very uncertain.Even we don't know which kind of sensation love is or we are just like some one.If a person says that he/she loves you,don't trust him/her immediatelly.Test is very necessary.
How to test the person is a big issue.But I think time can be a good way to test love.If somebody has loved you more than 5 years ,I think his love is true.But it needs time.By the way,love isn't all things to you after all.