split_test.go RawHistoryFolder

1// SPDX-License-Identifier: MIT
2
3package execstream
4
5import (
6	"strings"
7	"testing"
8	"unicode/utf8"
9)
10
11func TestSplitLine(t *testing.T) {
12	if got := SplitLine("", 10); len(got) != 1 || got[0] != "" {
13		t.Fatalf("empty: %q", got)
14	}
15	if got := SplitLine("short", 10); len(got) != 1 || got[0] != "short" {
16		t.Fatalf("%q", got)
17	}
18	// Cuts at character boundaries and joins back exactly.
19	in := strings.Repeat("é€😀a", 40) // 2, 3, 4, 1 bytes
20	for _, max := range []int{4, 5, 7, 10, 33} {
21		parts := SplitLine(in, max)
22		var b strings.Builder
23		for _, p := range parts {
24			if len(p) > max || !utf8.ValidString(p) || p == "" {
25				t.Fatalf("max %d: bad piece %q", max, p)
26			}
27			b.WriteString(p)
28		}
29		if b.String() != in {
30			t.Fatalf("max %d: pieces do not rebuild the line", max)
31		}
32	}
33	// Invalid UTF-8 is replaced before cutting.
34	if got := SplitLine("a\xffb", 10); got[0] != "a\ufffdb" {
35		t.Fatalf("%q", got)
36	}
37	big := SplitLine(strings.Repeat("x", 3*MaxLogLine+5), MaxLogLine)
38	if len(big) != 4 || len(big[0]) != MaxLogLine || len(big[3]) != 5 {
39		t.Fatalf("%d pieces", len(big))
40	}
41}