1 [!fuzz-instrumented] skip
2
3 [short] skip
4 env GOCACHE=$WORK/cache
5
6 # Fuzz cache should not exist after a regular test run.
7 go test .
8 exists $GOCACHE
9 ! exists $GOCACHE/fuzz
10
11 # Fuzzing should write interesting values to the cache.
12 go test -fuzz=FuzzY -fuzztime=100x .
13 go run ./contains_files $GOCACHE/fuzz/example.com/y/FuzzY
14
15 # 'go clean -cache' should not delete the fuzz cache.
16 go clean -cache
17 exists $GOCACHE/fuzz
18
19 # 'go clean -fuzzcache' should delete the fuzz cache but not the build cache.
20 go build -x ./empty
21 stderr '(compile|gccgo)( |\.exe).*empty.go'
22 go clean -fuzzcache
23 ! exists $GOCACHE/fuzz
24 go build -x ./empty
25 ! stderr '(compile|gccgo)( |\.exe).*empty.go'
26
27 # Fuzzing indicates that one new interesting value was found with an empty
28 # corpus, and the total size of the cache is now 1.
29 go clean -fuzzcache
30 go test -fuzz=FuzzEmpty -fuzztime=10000x .
31 stdout 'new interesting: 1'
32 stdout 'total: 1'
33
34 # Fuzzing again with a small fuzztime does not find any other interesting
35 # values but still indicates that the cache size is 1.
36 go test -fuzz=FuzzEmpty -fuzztime=2x .
37 stdout 'new interesting: 0'
38 stdout 'total: 1'
39
40 ! go clean -fuzzcache example.com/y
41 stderr 'go: clean -fuzzcache cannot be used with package arguments'
42
43 -- go.mod --
44 module example.com/y
45
46 go 1.16
47 -- y_test.go --
48 package y
49
50 import (
51 "io"
52 "testing"
53 )
54
55 func FuzzEmpty(f *testing.F) {
56 f.Fuzz(func (*testing.T, []byte) {})
57 }
58
59 func FuzzY(f *testing.F) {
60 f.Add([]byte("y"))
61 f.Fuzz(func(t *testing.T, b []byte) { Y(io.Discard, b) })
62 }
63 -- y.go --
64 package y
65
66 import (
67 "bytes"
68 "io"
69 )
70
71 func Y(w io.Writer, b []byte) {
72 if !bytes.Equal(b, []byte("y")) {
73 w.Write([]byte("not equal"))
74 }
75 }
76 -- empty/empty.go --
77 package empty
78 -- contains_files/contains_files.go --
79 package main
80
81 import (
82 "fmt"
83 "path/filepath"
84 "io/ioutil"
85 "os"
86 )
87
88 func main() {
89 infos, err := ioutil.ReadDir(filepath.Clean(os.Args[1]))
90 if err != nil {
91 fmt.Fprintln(os.Stderr, err)
92 os.Exit(1)
93 }
94 if len(infos) == 0 {
95 os.Exit(1)
96 }
97 }
98
View as plain text