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internal/runtime/cgroup: lineReader fuzz test

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The original unit test is converted to a fuzz test, to be more confident
on future refactors. All sub-tests are converted to seed corpus.

Change-Id: Id0c167ed47729a00ea0614d17746ddcc284697d3
Reviewed-on: https://go-review.googlesource.com/c/go/+/723581
Auto-Submit: Michael Pratt <mpratt@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Reviewed-by: Michael Pratt <mpratt@google.com>
This commit is contained in:
胡玮文 2025-11-24 02:29:24 +08:00 • committed by Gopher Robot
parent ac3e0ae51a
commit 67851547d8
1 changed files with 136 additions and 97 deletions
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233
src/internal/runtime/cgroup/line_reader_test.go
View file

@ -11,131 +11,134 @@ import (
"testing"
)
func TestLineReader(t *testing.T) {
type nextLine struct {
line string
incomplete bool // next call before this line should return incomplete
}
complete := func(s string) nextLine {
return nextLine{line: s}
}
incomplete := func(s string) nextLine {
return nextLine{line: s, incomplete: true}
}
type nextLine struct {
line string
incomplete bool // next call before this line should return incomplete
}
const scratchSize = 8
func complete(s string) nextLine {
return nextLine{line: s}
}
func incomplete(s string) nextLine {
return nextLine{line: s, incomplete: true}
}
tests := []struct {
name string
contents string
want []nextLine
}{
{
name: "empty",
contents: "",
const scratchSize = 8
var readerTests = []struct {
name string
contents string
want []nextLine
}{
{
name: "empty",
contents: "",
},
{
name: "single",
contents: "1234\n",
want: []nextLine{
complete("1234"),
},
{
name: "single",
contents: "1234\n",
want: []nextLine{
complete("1234"),
},
},
{
name: "single-incomplete",
contents: "1234",
want: []nextLine{
incomplete("1234"),
},
{
name: "single-incomplete",
contents: "1234",
want: []nextLine{
incomplete("1234"),
},
},
{
name: "single-exact",
contents: "1234567\n",
want: []nextLine{
complete("1234567"),
},
{
name: "single-exact",
contents: "1234567\n",
want: []nextLine{
complete("1234567"),
},
},
{
name: "single-exact-incomplete",
contents: "12345678",
want: []nextLine{
incomplete("12345678"),
},
{
name: "single-exact-incomplete",
contents: "12345678",
want: []nextLine{
incomplete("12345678"),
},
},
{
name: "multi",
contents: `1234
},
{
name: "multi",
contents: `1234
5678
`,
want: []nextLine{
complete("1234"),
complete("5678"),
},
want: []nextLine{
complete("1234"),
complete("5678"),
},
{
name: "multi-short",
contents: `12
},
{
name: "multi-short",
contents: `12
34
56
78
`,
want: []nextLine{
complete("12"),
complete("34"),
complete("56"),
complete("78"),
},
want: []nextLine{
complete("12"),
complete("34"),
complete("56"),
complete("78"),
},
{
name: "multi-notrailingnewline",
contents: `1234
},
{
name: "multi-notrailingnewline",
contents: `1234
5678`,
want: []nextLine{
complete("1234"),
incomplete("5678"),
},
want: []nextLine{
complete("1234"),
incomplete("5678"),
},
{
name: "middle-too-long",
contents: `1234
},
{
name: "middle-too-long",
contents: `1234
1234567890
5678
`,
want: []nextLine{
complete("1234"),
incomplete("12345678"),
complete("5678"),
},
want: []nextLine{
complete("1234"),
incomplete("12345678"),
complete("5678"),
},
{
// Multiple reads required to find newline.
name: "middle-way-too-long",
contents: `1234
},
{
// Multiple reads required to find newline.
name: "middle-way-too-long",
contents: `1234
12345678900000000000000000000000000000000000000000000000000
5678
`,
want: []nextLine{
complete("1234"),
incomplete("12345678"),
complete("5678"),
},
want: []nextLine{
complete("1234"),
incomplete("12345678"),
complete("5678"),
},
},
}
func readString(contents string) func(fd int, b []byte) (int, uintptr) {
r := strings.NewReader(contents)
return func(fd int, b []byte) (int, uintptr) {
n, err := r.Read(b)
if err != nil && err != io.EOF {
const dummyErrno = 42
return n, dummyErrno
}
return n, 0
}
}
for _, tc := range tests {
func TestLineReader(t *testing.T) {
for _, tc := range readerTests {
t.Run(tc.name, func(t *testing.T) {
r := strings.NewReader(tc.contents)
read := func(fd int, b []byte) (int, uintptr) {
n, err := r.Read(b)
if err != nil && err != io.EOF {
const dummyErrno = 42
return n, dummyErrno
}
return n, 0
}
var scratch [scratchSize]byte
l := cgroup.NewLineReader(0, scratch[:], read)
l := cgroup.NewLineReader(0, scratch[:], readString(tc.contents))
var got []nextLine
for {
@ -168,3 +171,39 @@ func TestLineReader(t *testing.T) {
})
}
}
func FuzzLineReader(f *testing.F) {
for _, tc := range readerTests {
f.Add(tc.contents)
}
f.Fuzz(func(t *testing.T, input string) {
scratch := make([]byte, scratchSize)
reader := cgroup.NewLineReader(0, scratch, readString(input))
for expected := range strings.Lines(input) {
err := reader.Next()
line := reader.Line()
var expectedErr error
if len(expected) > scratchSize {
expected = expected[:scratchSize]
expectedErr = cgroup.ErrIncompleteLine
} else if expected[len(expected)-1] == '\n' {
expected = expected[:len(expected)-1]
} else {
expectedErr = cgroup.ErrIncompleteLine
}
if err != expectedErr {
t.Fatalf("got err %v, want %v", err, expectedErr)
}
if string(line) != expected {
t.Fatalf("got %q, want %q", string(line), expected)
}
}
err := reader.Next()
if err != cgroup.ErrEOF {
t.Fatalf("got %v, want EOF", err)
}
})
}