1 package rand
2
3 import (
4 "bytes"
5 "io"
6 "testing"
7 )
8
9 func TestGitterDelay(t *testing.T) {
10 maxFloat1 := 1 - 1/float64(1<<53)
11
12 cases := map[string]struct {
13 Reader io.Reader
14 Expect float64
15 }{
16 "floor": {
17 Reader: bytes.NewReader([]byte{0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}),
18 Expect: 0,
19 },
20 "ceiling": {
21 Reader: bytes.NewReader([]byte{0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF}),
22 Expect: maxFloat1,
23 },
24 }
25
26 for name, c := range cases {
27 t.Run(name, func(t *testing.T) {
28 d, err := Float64(c.Reader)
29 if err != nil {
30 t.Fatalf("expect no error, %v", err)
31 }
32
33 if e, a := c.Expect, d; e != a {
34 t.Errorf("expect %v delay, got %v", e, a)
35 }
36 })
37 }
38 }
39
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