1package captcha
 2
 3import (
 4	"bytes"
 5	"testing"
 6)
 7
 8func TestSiphash(t *testing.T) {
 9	good := uint64(0xe849e8bb6ffe2567)
10	cur := siphash(0, 0, 0)
11	if cur != good {
12		t.Fatalf("siphash: expected %x, got %x", good, cur)
13	}
14}
15
16func TestSiprng(t *testing.T) {
17	m := make(map[uint64]interface{})
18	var yes interface{}
19	r := siprng{}
20	r.Seed([16]byte{0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15})
21	for i := 0; i < 100000; i++ {
22		v := r.Uint64()
23		if _, ok := m[v]; ok {
24			t.Errorf("siphash: collision on %d: %x", i, v)
25		}
26		m[v] = yes
27	}
28}
29
30func TestSiprngBytes(t *testing.T) {
31	r := siprng{}
32	r.Seed([16]byte{0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15})
33	x := r.Bytes(32)
34	if len(x) != 32 {
35		t.Fatalf("siphash: wrong length: expected 32, got %d", len(x))
36	}
37	y := r.Bytes(32)
38	if bytes.Equal(x, y) {
39		t.Fatalf("siphash: stream repeats: %x = %x", x, y)
40	}
41	r.Seed([16]byte{})
42	z := r.Bytes(32)
43	if bytes.Equal(z, x) {
44		t.Fatalf("siphash: outputs under different keys repeat: %x = %x", z, x)
45	}
46}
47
48func BenchmarkSiprng(b *testing.B) {
49	b.SetBytes(8)
50	p := &siprng{}
51	for i := 0; i < b.N; i++ {
52		p.Uint64()
53	}
54}