Sometimes you just need test coverage.
go install astuart.co/bstest@latest && bstest && go test -cover
➜ ~C/foo git:(master) ✗ go test -cover
? astuart.co/foo [no test files]
➜ ~C/foo git:(master) ✗ bstest 99
➜ ~C/foo git:(master) ✗ go test -cover
PASS
coverage: 99.9% of statements
ok astuart.co/foo 0.036s