Create category object to test the uniqueness of name
Create category object to test the uniqueness of name

It was failling because `shoulda-mathers` was generating the value as integer
and what we need it a string.

MicroPasts/micropasts-crowdfunding,MicroPasts/micropasts-crowdfunding,gustavoguichard/neighborly,MicroPasts/micropasts-crowdfunding,gustavoguichard/neighborly,MicroPasts/micropasts-crowdfunding,gustavoguichard/neighborly