1 [!fuzz] skip
2 [short] skip
3 env GOCACHE=$WORK/cache
4
5 # There are no seed values, so 'go test' should finish quickly.
6 go test
7
8 # For the fuzzing phase, we reduce GOMAXPROCS to avoid consuming too many
9 # resources during the test. Ideally this would just free up resources to run
10 # other parallel tests more quickly, but unfortunately it is actually necessary
11 # in some 32-bit environments to prevent the fuzzing engine from running out of
12 # address space (see https://go.dev/issue/65434).
13 env GOMAXPROCS=2
14
15 # Fuzzing should exit 0 after fuzztime, even if timeout is short.
16 go test -timeout=3s -fuzz=FuzzFast -fuzztime=5s
17
18 # We should see the same behavior when invoking the test binary directly.
19 go test -c
20 exec ./fuzz.test$GOEXE -test.timeout=3s -test.fuzz=FuzzFast -test.fuzztime=5s -test.parallel=1 -test.fuzzcachedir=$WORK/cache
21
22 # Timeout should not cause inputs to be written as crashers.
23 ! exists testdata/fuzz
24
25 # When we use fuzztime with an "x" suffix, it runs a specific number of times.
26 # This fuzz function creates a file with a unique name ($pid.$count) on each
27 # run. We count the files to find the number of runs.
28 mkdir count
29 go test -fuzz=FuzzTestCount -fuzztime=1000x -fuzzminimizetime=1x
30 go run check_file_count.go count 1000
31
32 # When we use fuzzminimizetime with an "x" suffix, it runs a specific number of
33 # times while minimizing. This fuzz function creates a file with a unique name
34 # ($pid.$count) on each run once the first crash has been found. That means that
35 # there should be one file for each execution of the fuzz function during
36 # minimization, so we count these to determine how many times minimization was
37 # run.
38 mkdir minimizecount
39 ! go test -fuzz=FuzzMinimizeCount -fuzzminimizetime=3x -parallel=1
40 go run check_file_count.go minimizecount 3
41
42 -- go.mod --
43 module fuzz
44
45 go 1.16
46 -- fuzz_fast_test.go --
47 package fuzz_test
48
49 import "testing"
50
51 func FuzzFast(f *testing.F) {
52 f.Fuzz(func (*testing.T, []byte) {})
53 }
54 -- fuzz_count_test.go --
55 package fuzz
56
57 import (
58 "fmt"
59 "os"
60 "testing"
61 )
62
63 func FuzzTestCount(f *testing.F) {
64 pid := os.Getpid()
65 n := 0
66 f.Fuzz(func(t *testing.T, _ []byte) {
67 name := fmt.Sprintf("count/%v.%d", pid, n)
68 if err := os.WriteFile(name, nil, 0666); err != nil {
69 t.Fatal(err)
70 }
71 n++
72 })
73 }
74 -- fuzz_minimize_count_test.go --
75 package fuzz
76
77 import (
78 "bytes"
79 "fmt"
80 "os"
81 "testing"
82 )
83
84 func FuzzMinimizeCount(f *testing.F) {
85 pid := os.Getpid()
86 n := 0
87 seed := bytes.Repeat([]byte("a"), 357)
88 f.Add(seed)
89 crashFound := false
90 f.Fuzz(func(t *testing.T, b []byte) {
91 if crashFound {
92 name := fmt.Sprintf("minimizecount/%v.%d", pid, n)
93 if err := os.WriteFile(name, nil, 0666); err != nil {
94 t.Fatal(err)
95 }
96 n++
97 }
98 if !bytes.Equal(b, seed) { // this should happen right away
99 crashFound = true
100 t.Error("minimize this!")
101 }
102 })
103 }
104 -- check_file_count.go --
105 // +build ignore
106
107 package main
108
109 import (
110 "fmt"
111 "os"
112 "strconv"
113 )
114
115 func main() {
116 dir, err := os.ReadDir(os.Args[1])
117 if err != nil {
118 fmt.Fprintln(os.Stderr, err)
119 os.Exit(1)
120 }
121 got := len(dir)
122 want, _ := strconv.Atoi(os.Args[2])
123 if got != want {
124 fmt.Fprintf(os.Stderr, "got %d files; want %d\n", got, want)
125 os.Exit(1)
126 }
127 }
128
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