Artifact [9cfa1121e7]

Artifact 9cfa1121e74140e37d97e135688582c636001931bfc673185d5c14cf8aca400f:

• File internal/merge/text_test.go — part of check-in [eb1791acd5] at 2026-10-19 01:52:19 on branch feat/submanifest-reader — fix(merge): IsText converts as fossil's text_diff does

  Read data through the ported BOM/UTF-16 conversion and line splitter, so the Update gate and the merge agree on what is text.

  Tracked in #447 (user: [email protected], size: 830) [annotate] [blame] [check-ins using] [more...]

package merge

import (
	"bytes"
	"testing"
)

func TestIsText(t *testing.T) {
	long := bytes.Repeat([]byte("a"), lineLimit)
	cases := []struct {
		name string
		data []byte
		want bool
	}{
		{"empty", []byte{}, true},
		{"lines", []byte("a\nb\n"), true},
		{"no final newline", []byte("a\nb"), true},
		{"NUL", []byte("a\x00b\n"), false},
		{"longest line", append(append([]byte{}, long...), '\n'), true},
		{"line too long", append(append([]byte{}, long...), 'a', '\n'), false},
		{"last line too long", append(append([]byte("x\n"), long...), 'a'), false},
		{"utf-16 converted", []byte("\xff\xfea\x00\n\x00"), true},
		{"bom cuts at NUL", []byte("\xef\xbb\xbfa\x00b\n"), true},
	}
	for _, tc := range cases {
		if got := IsText(tc.data); got != tc.want {
			t.Errorf("%s: IsText = %v, want %v", tc.name, got, tc.want)
		}
	}
}