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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)
}
}
const step = 32768
func TestUniqueness(t *testing.T) {
g := MustNewGenerator()
mc := make(chan map[[24]byte]int)
const nproc = 4
for i := 0; i < nproc; i++ {
go func() {
m := make(map[[24]byte]int)
for i := 0; i < step*10; i++ {
uuid := g.Next()
if old, ok := m[uuid]; ok {
t.Errorf("non-unique uuid seq at %d, other %d", i, old)
}
m[uuid] = i
}
mc <- m
}()
}
m := make(map[[24]byte]int)
for i := 0; i < nproc; i++ {
for uuid, iter := range <-mc {
if old, ok := m[uuid]; ok {
t.Errorf("non-unique uuid seq at %d, other %d", i, old)
}
m[uuid] = iter
}
}
}
func TestHex128(t *testing.T) {
var b [24]byte
for i := range b {
b[i] = byte(i + 1)
}
// Note: byte 6 is swapped with byte 9.
got, want := Hex128(b), "01020304-0506-4a08-8907-0b0c0d0e0f10"
if got != want {
t.Fatalf("unexpected Hex128 result; got %q want %q", got, want)
}
}
var validHex128Tests = []struct {
u string
valid bool
}{{
u: "01020304-0506-0708-090a-0b0c0d0e0f10",
valid: true,
}, {
u: "01020304-0506-0708-090a-0b0c0d0e0f1",
valid: false,
}, {
u: "0102030430506-0708-090a-0b0c0d0e0f1",
valid: false,
}, {
u: "01020304-050630708-090a-0b0c0d0e0f1",
valid: false,
}, {
u: "01020304-0506-07084090a-0b0c0d0e0f1",
valid: false,
}, {
u: "01020304-0506-0708-090a50b0c0d0e0f1",
valid: false,
}, {
u: "01020304-0506-0708-090a-0b0c0d0e0f1",
valid: false,
}, {
u: "01020304-0506-0708-090a-0b0c0d0e0f102",
valid: false,
}, {
u: "01020304-0506-0708-090a-0b0c0d0e0f1/",
valid: false,
}}
func TestValidHex128(t *testing.T) {
for _, test := range validHex128Tests {
t.Run(test.u, func(t *testing.T) {
if got := ValidHex128(test.u); got != test.valid {
t.Fatalf("unexpected valid for %q; got %v want %v", test.u, got, test.valid)
}
})
}
}
var _s string
func BenchmarkHex128(b *testing.B) {
g := MustNewGenerator()
for i := 0; i < b.N; i++ {
_s = Hex128(g.Next())
}
}
func BenchmarkNext(b *testing.B) {
g := MustNewGenerator()
for i := 0; i < b.N; i++ {
g.Next()
}
}
func BenchmarkContended(b *testing.B) {
g := MustNewGenerator()
b.RunParallel(func(pb *testing.PB) {
for pb.Next() {
g.Next()
}
})
}
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