Merge pull request ipfs/boxoipfs/interface-go-ipfs-core#24 from ipfs/test/use-fatal

fix a bunch of small test "bugs" This commit was moved from ipfs/interface-go-ipfs-core@ccf9dacfee2626f60a685384905d32fb3c350d82 This commit was moved from ipfs/boxo@c9c75b02ce8a31e6801da94db5f0ab45694470e0