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// Copyright 2021 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
//go:build darwin || freebsd || linux || windows
package fuzz
import (
"bytes"
"context"
"errors"
"fmt"
"reflect"
"testing"
"time"
"unicode"
"unicode/utf8"
)
func TestMinimizeInput(t *testing.T) {
type testcase struct {
name string
fn func(CorpusEntry) error
input []any
expected []any
}
cases := []testcase{
{
name: "ones_byte",
fn: func(e CorpusEntry) error {
b := e.Values[0].([]byte)
ones := 0
for _, v := range b {
if v == 1 {
ones++
}
}
if ones == 3 {
return fmt.Errorf("bad %v", e.Values[0])
}
return nil
},
input: []any{[]byte{0, 0, 1, 0, 1, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}},
expected: []any{[]byte{1, 1, 1}},
},
{
name: "single_bytes",
fn: func(e CorpusEntry) error {
b := e.Values[0].([]byte)
if len(b) < 2 {
return nil
}
if len(b) == 2 && b[0] == 1 && b[1] == 2 {
return nil
}
return fmt.Errorf("bad %v", e.Values[0])
},
input: []any{[]byte{1, 2, 3, 4, 5}},
expected: []any{[]byte("00")},
},
{
name: "set_of_bytes",
fn: func(e CorpusEntry) error {
b := e.Values[0].([]byte)
if len(b) < 3 {
return nil
}
if bytes.Equal(b, []byte{0, 1, 2, 3, 4, 5}) || bytes.Equal(b, []byte{0, 4, 5}) {
return fmt.Errorf("bad %v", e.Values[0])
}
return nil
},
input: []any{[]byte{0, 1, 2, 3, 4, 5}},
expected: []any{[]byte{0, 4, 5}},
},
{
name: "non_ascii_bytes",
fn: func(e CorpusEntry) error {
b := e.Values[0].([]byte)
if len(b) == 3 {
return fmt.Errorf("bad %v", e.Values[0])
}
return nil
},
input: []any{[]byte("ท")}, // ท is 3 bytes
expected: []any{[]byte("000")},
},
{
name: "ones_string",
fn: func(e CorpusEntry) error {
b := e.Values[0].(string)
ones := 0
for _, v := range b {
if v == '1' {
ones++
}
}
if ones == 3 {
return fmt.Errorf("bad %v", e.Values[0])
}
return nil
},
input: []any{"001010001000000000000000000"},
expected: []any{"111"},
},
{
name: "string_length",
fn: func(e CorpusEntry) error {
b := e.Values[0].(string)
if len(b) == 5 {
return fmt.Errorf("bad %v", e.Values[0])
}
return nil
},
input: []any{"zzzzz"},
expected: []any{"00000"},
},
{
name: "string_with_letter",
fn: func(e CorpusEntry) error {
b := e.Values[0].(string)
r, _ := utf8.DecodeRune([]byte(b))
if unicode.IsLetter(r) {
return fmt.Errorf("bad %v", e.Values[0])
}
return nil
},
input: []any{"ZZZZZ"},
expected: []any{"A"},
},
}
for _, tc := range cases {
tc := tc
t.Run(tc.name, func(t *testing.T) {
t.Parallel()
ws := &workerServer{
fuzzFn: func(e CorpusEntry) (time.Duration, error) {
return time.Second, tc.fn(e)
},
}
mem := &sharedMem{region: make([]byte, 100)} // big enough to hold value and header
vals := tc.input
success, err := ws.minimizeInput(context.Background(), vals, mem, minimizeArgs{})
if !success {
t.Errorf("minimizeInput did not succeed")
}
if err == nil {
t.Fatal("minimizeInput didn't provide an error")
}
if expected := fmt.Sprintf("bad %v", tc.expected[0]); err.Error() != expected {
t.Errorf("unexpected error: got %q, want %q", err, expected)
}
if !reflect.DeepEqual(vals, tc.expected) {
t.Errorf("unexpected results: got %v, want %v", vals, tc.expected)
}
})
}
}
// TestMinimizeFlaky checks that if we're minimizing an interesting
// input and a flaky failure occurs, that minimization was not indicated
// to be successful, and the error isn't returned (since it's flaky).
func TestMinimizeFlaky(t *testing.T) {
ws := &workerServer{fuzzFn: func(e CorpusEntry) (time.Duration, error) {
return time.Second, errors.New("ohno")
}}
mem := &sharedMem{region: make([]byte, 100)} // big enough to hold value and header
vals := []any{[]byte(nil)}
args := minimizeArgs{KeepCoverage: make([]byte, len(coverageSnapshot))}
success, err := ws.minimizeInput(context.Background(), vals, mem, args)
if success {
t.Error("unexpected success")
}
if err != nil {
t.Errorf("unexpected error: %v", err)
}
if count := mem.header().count; count != 1 {
t.Errorf("count: got %d, want 1", count)
}
}
|
