eightball_test.gno

 1package eightball
 2
 3import (
 4	"testing"
 5
 6	"gno.land/p/nt/uassert/v0"
 7)
 8
 9func TestAnswerIndexInRange(t *testing.T) {
10	cases := []struct {
11		height int64
12		n      int
13	}{
14		{0, 0}, {1, 0}, {19, 0}, {20, 0}, {21, 5},
15		{999999, 3}, {-1, 0}, {-1000, 7},
16	}
17	for _, c := range cases {
18		idx := answerIndex(c.height, c.n)
19		uassert.True(t, idx >= 0 && idx < len(answers),
20			"index out of range for height="+itoa(c.height))
21	}
22}
23
24func TestAnswerIndexDeterministic(t *testing.T) {
25	uassert.Equal(t, answerIndex(42, 3), answerIndex(42, 3), "same inputs, same slot")
26}
27
28func TestRenderEmpty(t *testing.T) {
29	out := Render("")
30	uassert.NotEmpty(t, out, "render must not be empty")
31	uassert.True(t, len(answers) == 20, "classic 8-ball has 20 answers")
32}
33
34func itoa(n int64) string {
35	neg := n < 0
36	if neg {
37		n = -n
38	}
39	if n == 0 {
40		return "0"
41	}
42	var b [24]byte
43	i := len(b)
44	for n > 0 {
45		i--
46		b[i] = byte('0' + n%10)
47		n /= 10
48	}
49	if neg {
50		i--
51		b[i] = '-'
52	}
53	return string(b[i:])
54}