Data science, second try

Ehhh, I'm not sure this test is exercising much, since you specified that JSON by yourself. What are you using the `file_name` var for anyway? A more valuable test (that you sort of hinted at below) is to see that -- if I pass in a file with ten rows in an array of hashes, that I get that back as data.

Another thing that might be worth testing is that when you pass it a file that _isn't_ JSON, it does something suitably horrifying.