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package fastuuid
import (
"bytes"
"crypto/rand"
"testing"
)
func TestUUID(t *testing.T) {
var buf [24]byte
for i := range buf {
buf[i] = byte(i) + 1
}
oldReader := rand.Reader
rand.Reader = bytes.NewReader(buf[:])
g, err := NewGenerator()
rand.Reader = oldReader
if err != nil {
t.Fatalf("cannot make generator: %v", err)
}
uuid := g.Next()
buf[0] = 1 ^ 1
if uuid != buf {
t.Fatalf("unexpected UUID; got %x; want %x", uuid, buf)
}
uuid = g.Next()
buf[0] = 1 ^ 2
if uuid != buf {
t.Fatalf("unexpected next UUID; got %x; want %x", uuid, buf)
}
}
func TestUniqueness(t *testing.T) {
g := MustNewGenerator()
m := make(map[[24]byte]int)
for i := 0; i < 65537; i++ {
uuid := g.Next()
if old, ok := m[uuid]; ok {
t.Fatalf("non-unique uuid seq at %d, other %d", i, old)
}
m[uuid] = i
}
}
func BenchmarkNext(b *testing.B) {
g := MustNewGenerator()
for i := 0; i < b.N; i++ {
g.Next()
}
}
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