Are the African American Ancestry DNA tests valid?

I was contemplating taking the african american ancestry dna test and I was wondering if it was a valid way to trace your heritage. People are so crooked now a days and well....I just don't want to end up wasting 0 on bogus results. I really feel the need to know more about my ancestors and exactly where they originated. Please help, if you can. Thanks.

Where can I get a DNA ancestry test done and how?

I want to see my family's Ancestry so where can I get a Ancestry DNA test and how. I would like to know the price range too.