1[!fuzz-instrumented] skip
2
3[short] skip
4env GOCACHE=$WORK/cache
5
6# Fuzz cache should not exist after a regular test run.
7go test .
8exists $GOCACHE
9! exists $GOCACHE/fuzz
10
11# Fuzzing should write interesting values to the cache.
12go test -fuzz=FuzzY -fuzztime=100x .
13go run ./contains_files $GOCACHE/fuzz/example.com/y/FuzzY
14
15# 'go clean -cache' should not delete the fuzz cache.
16go clean -cache
17exists $GOCACHE/fuzz
18
19# 'go clean -fuzzcache' should delete the fuzz cache but not the build cache.
20go build -x ./empty
21stderr '(compile|gccgo)( |\.exe).*empty.go'
22go clean -fuzzcache
23! exists $GOCACHE/fuzz
24go 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.
29go clean -fuzzcache
30go test -fuzz=FuzzEmpty -fuzztime=10000x .
31stdout 'new interesting: 1'
32stdout '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.
36go test -fuzz=FuzzEmpty -fuzztime=2x .
37stdout 'new interesting: 0'
38stdout 'total: 1'
39
40! go clean -fuzzcache example.com/y
41stderr 'go: clean -fuzzcache cannot be used with package arguments'
42
43-- go.mod --
44module example.com/y
45
46go 1.16
47-- y_test.go --
48package y
49
50import (
51 "io"
52 "testing"
53)
54
55func FuzzEmpty(f *testing.F) {
56 f.Fuzz(func (*testing.T, []byte) {})
57}
58
59func 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 --
64package y
65
66import (
67 "bytes"
68 "io"
69)
70
71func 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 --
77package empty
78-- contains_files/contains_files.go --
79package main
80
81import (
82 "fmt"
83 "path/filepath"
84 "io/ioutil"
85 "os"
86)
87
88func 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}
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