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package mnemonics
import (
"bytes"
"crypto/rand"
"testing"
"unicode/utf8"
"golang.org/x/text/unicode/norm"
)
// TestGermanDictionary checks that the german dictionary is well formed.
func TestGermanDictionary(t *testing.T) {
// Check for sane constants.
if German != "german" {
t.Error("unexpected identifier for german dictionary")
}
if GermanUniquePrefixLen != 4 {
t.Error("unexpected prefix len for german dictionary")
}
// Check that the dictionary has well formed elements, and no repeats.
gerMap := make(map[string]struct{})
for _, word := range germanDictionary {
// Check that the word is long enough.
if utf8.RuneCountInString(word) < GermanUniquePrefixLen {
t.Fatal("found a short word:", word)
}
// Check that the word is normalized.
newWord := norm.NFC.String(word)
if newWord != word {
t.Error("found a non-normalized word:", word)
}
// Fetch the prefix, composed of the first GermanUniquePrefixLen runes.
var prefix []byte
var runeCount int
for _, r := range word {
encR := make([]byte, utf8.RuneLen(r))
utf8.EncodeRune(encR, r)
prefix = append(prefix, encR...)
runeCount++
if runeCount == GermanUniquePrefixLen {
break
}
}
// Check that the prefix is unique.
str := string(prefix)
_, exists := gerMap[str]
if exists {
t.Error("found a prefix conflict:", word)
}
gerMap[str] = struct{}{}
}
// Do some conversions with the german dictionary.
for i := 1; i <= 32; i++ {
for j := 0; j < 5; j++ {
entropy := make([]byte, i)
_, err := rand.Read(entropy)
if err != nil {
t.Fatal(err)
}
phrase, err := ToPhrase(entropy, German)
if err != nil {
t.Fatal(err)
}
check, err := FromPhrase(phrase, German)
if err != nil {
t.Fatal(err)
}
if bytes.Compare(entropy, check) != 0 {
t.Error("conversion check failed for the german dictionary")
}
}
}
// Check that words in a phrase can be altered according to the prefix
// rule.
entropy := []byte{1, 2, 3, 4}
phrase := Phrase{"bete", "Rieglfffffzzzz", "Abundans"}
check, err := FromPhrase(phrase, German)
if err != nil {
t.Fatal(err)
}
if bytes.Compare(entropy, check) != 0 {
t.Error("phrase substitution failed")
}
}
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