zz_zerowidth_test.gno

 1package guestbook
 2
 3import (
 4	"testing"
 5)
 6
 7// zwBlank holds one input per rune range chain/markdown.StripBidiAndZeroWidth
 8// removes (U+200B..U+200F, U+202A..U+202E, U+2066..U+2069, U+FEFF), plus a mix
 9// with real spaces. strings.TrimSpace keeps every one of them and the render
10// strips them all, so each must be refused.
11var zwBlank = []string{
12	"\u200b\u200b\u200b", // ZWSP
13	"\u200d",             // ZWJ
14	"\u200e",             // LRM
15	"\u202e",             // RLO
16	"\u2066\u2069",       // LRI PDI
17	"\ufeff",             // BOM
18	" \u200b \u200b ",    // mixed with real spaces
19}
20
21// zwOK must stay accepted: the stripper removes the marks and leaves text.
22var zwOK = []string{"a", "a\u200bb", "  padded  "}
23
24func zwPanics(f func()) (p bool) {
25	defer func() {
26		if recover() != nil {
27			p = true
28		}
29	}()
30	f()
31	return false
32}
33
34func TestZeroWidthMessageIsRefused(t *testing.T) {
35	resetState()
36	defer resetState()
37	for _, s := range zwBlank {
38		if !zwPanics(func() { addEntry("g1alice", s, 1) }) {
39			t.Errorf("addEntry(%q) accepted a message the render strips to blank", s)
40		}
41	}
42	for _, s := range zwOK {
43		if zwPanics(func() { addEntry("g1alice", s, 1) }) {
44			t.Errorf("addEntry(%q) refused a message that renders as text", s)
45		}
46	}
47	if Count() != len(zwOK) {
48		t.Errorf("Count = %d, want %d", Count(), len(zwOK))
49	}
50}