console.log

➜  publicsuffix-go git:(master) ✗ cd ~/go/src/golang.org/x/net/idna; git co 69d4b8; cd -; go run idna-test.go
Note: checking out '69d4b8'.

You are in 'detached HEAD' state. You can look around, make experimental
changes and commit them, and you can discard any commits you make in this
state without impacting any branches by performing another checkout.

If you want to create a new branch to retain commits you create, you may
do so (now or later) by using -b with the checkout command again. Example:

  git checkout -b <new-branch-name>

HEAD is now at 69d4b8a... http2: remove unnecessary TODO for trailer keys allocation
~/go/src/github.com/weppos/publicsuffix-go
Empty string works!
Result: ``

➜  publicsuffix-go git:(master) ✗ cd ~/go/src/golang.org/x/net/idna; git co 67957f; cd -; go run idna-test.go
Previous HEAD position was 69d4b8a... http2: remove unnecessary TODO for trailer keys allocation
HEAD is now at 67957fd... idna: use code generated by internal x/text package
~/go/src/github.com/weppos/publicsuffix-go
Error converting empty string: idna: invalid label ""
exit status 1

idna-test.go

package main

import (
	"fmt"
	"os"

	"golang.org/x/net/idna"
)

func main() {
	s, err := idna.ToASCII("")
	if err != nil {
		fmt.Printf("Error converting empty string: %v\n", err)
		os.Exit(1)
	}

	fmt.Println("Empty string works!")
	fmt.Printf("Result: `%v`\n", s)
}

tests.log

➜  publicsuffix-go git:(master) ✗ cd ~/go/src/golang.org/x/net/idna; git co 69d4b8; cd -;
Previous HEAD position was 67957fd... idna: use code generated by internal x/text package
HEAD is now at 69d4b8a... http2: remove unnecessary TODO for trailer keys allocation
~/go/src/github.com/weppos/publicsuffix-go

➜  publicsuffix-go git:(master) ✗ go test ./...
?   	github.com/weppos/publicsuffix-go	[no test files]
?   	github.com/weppos/publicsuffix-go/cmd/gen	[no test files]
?   	github.com/weppos/publicsuffix-go/cmd/load	[no test files]
ok  	github.com/weppos/publicsuffix-go/net/publicsuffix	0.023s
ok  	github.com/weppos/publicsuffix-go/publicsuffix	0.060s

➜  publicsuffix-go git:(master) ✗ cd ~/go/src/golang.org/x/net/idna; git co 67957f; cd -;
Previous HEAD position was 69d4b8a... http2: remove unnecessary TODO for trailer keys allocation
HEAD is now at 67957fd... idna: use code generated by internal x/text package
~/go/src/github.com/weppos/publicsuffix-go

➜  publicsuffix-go git:(master) ✗ go test ./...
?   	github.com/weppos/publicsuffix-go	[no test files]
?   	github.com/weppos/publicsuffix-go/cmd/gen	[no test files]
?   	github.com/weppos/publicsuffix-go/cmd/load	[no test files]
ok  	github.com/weppos/publicsuffix-go/net/publicsuffix	0.037s
--- FAIL: TestPsl (0.02s)
	psl_test.go:72: PSL(.example.com) should have returned error, got: example.com
	psl_test.go:72: PSL(.example.example) should have returned error, got: example.example
--- FAIL: TestListFind (0.00s)
	publicsuffix_test.go:247: Find(example.uk) = &{2  2 false}, want &{2 uk 2 false}
	publicsuffix_test.go:247: Find(example.co.uk) = &{2  2 false}, want &{2 uk 2 false}
	publicsuffix_test.go:247: Find(foo.example.co.uk) = &{2  2 false}, want &{2 uk 2 false}
	publicsuffix_test.go:247: Find(british-library.uk) = &{2  2 false}, want &{3 british-library.uk 2 false}
	publicsuffix_test.go:247: Find(foo.british-library.uk) = &{2  2 false}, want &{3 british-library.uk 2 false}
	publicsuffix_test.go:247: Find(blogspot.com) = &{1 com 1 false}, want &{1 blogspot.com 2 true}
	publicsuffix_test.go:247: Find(foo.blogspot.com) = &{1 com 1 false}, want &{1 blogspot.com 2 true}
FAIL
FAIL	github.com/weppos/publicsuffix-go/publicsuffix	0.051s