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Add fuzzer: FuzzEncodeFromJSON #1028

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74 changes: 74 additions & 0 deletions fuzz_test.go
Original file line number Diff line number Diff line change
@@ -0,0 +1,74 @@
//go:build go1.18
// +build go1.18

package yaml_test

import (
"bytes"
"encoding/json"
"testing"

"gopkg.in/yaml.v3"
)

// FuzzEncodeFromJSON checks that any JSON encoded value can also be encoded as YAML... and decoded.
func FuzzEncodeFromJSON(f *testing.F) {
f.Add(`null`)
f.Add(`""`)
f.Add(`0`)
f.Add(`true`)
f.Add(`false`)
f.Add(`{}`)
f.Add(`[]`)
f.Add(`[[]]`)
f.Add(`{"a":[]}`)

f.Fuzz(func(t *testing.T, s string) {

var v interface{}
if err := json.Unmarshal([]byte(s), &v); err != nil {
t.Skip("not valid JSON")
}

t.Logf("JSON %q", s)
t.Logf("Go %q <%[1]x>", v)

// Encode as YAML
b, err := yaml.Marshal(v)
if err != nil {
t.Error(err)
}
t.Logf("YAML %q <%[1]x>", b)

// Decode as YAML
var v2 interface{}
if err := yaml.Unmarshal(b, &v2); err != nil {
t.Error(err)
}

t.Logf("Go %q <%[1]x>", v2)

/*
// Handling of number is different, so we can't have universal exact matching
if !reflect.DeepEqual(v2, v) {
t.Errorf("mismatch:\n- got: %#v\n- expected: %#v", v2, v)
}
*/

b2, err := yaml.Marshal(v2)
if err != nil {
t.Error(err)
}
t.Logf("YAML %q <%[1]x>", b2)

if !bytes.Equal(b, b2) {
t.Errorf("Marshal->Unmarshal->Marshal mismatch:\n- expected: %q\n- got: %q", b, b2)
}

})
}

func TestEncodeString(t *testing.T) {
b, _ := yaml.Marshal(`\n`)
t.Logf("%q <%[1]x>", string(b))
}