Add test for unixfs/format to reach 87% coverage.
Add test for unixfs/format to reach 87% coverage.

License: MIT
Signed-off-by: Zander Mackie <dad6048958a096c4d96d991a47a426a281ad31ed@gmail.com>

ianopolous/go-ipfs,chriscool/go-ipfs,ianopolous/go-ipfs,kyledrake/go-ipfs,rht/go-ipfs,insionng/go-ipfs,MichaelMure/go-ipfs,Luzifer/go-ipfs,Quantomicus/go-ipfs,insionng/go-ipfs,JustinDrake/go-ipfs,MichaelMure/go-ipfs,kyledrake/go-ipfs,Quantomicus/go-ipfs,OpenBazaar/go-ipfs,tswindell/go-ipfs,tswindell/go-ipfs,OpenBazaar/go-ipfs,insionng/go-ipfs,WilliButz/go-ipfs,llawall/go-ipfs,chriscool/go-ipfs,ianopolous/go-ipfs,WilliButz/go-ipfs,llawall/go-ipfs,rht/go-ipfs,tswindell/go-ipfs,rht/go-ipfs,llawall/go-ipfs,MichaelMure/go-ipfs,kyledrake/go-ipfs,Luzifer/go-ipfs,Quantomicus/go-ipfs,JustinDrake/go-ipfs,OpenBazaar/go-ipfs,Luzifer/go-ipfs,JustinDrake/go-ipfs,WilliButz/go-ipfs,chriscool/go-ipfs