Best friends!

So I been best friends with this lady that I been calling my sister for years we known each other since we we're both 5 years old where now almost 30. Anyway now that we got older we are starting to look alike most people say we look like sisters I just wish I had a picture to post. We are both from different families. So what am thinking is what if we took a DNA test? Do u think it would be a good idea if I can get a picture of us together I will post it.