1 files changed, 42 insertions, 0 deletions
diff --git a/src/encoding/json/fuzz.go b/src/encoding/json/fuzz.go
new file mode 100644
index 0000000..be03f0d
--- /dev/null
+++ b/src/encoding/json/fuzz.go
@@ -0,0 +1,42 @@
+// Copyright 2019 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.
+
+// +build gofuzz
+
+package json
+
+import (
+	"fmt"
+)
+
+func Fuzz(data []byte) (score int) {
+	for _, ctor := range []func() interface{}{
+		func() interface{} { return new(interface{}) },
+		func() interface{} { return new(map[string]interface{}) },
+		func() interface{} { return new([]interface{}) },
+	} {
+		v := ctor()
+		err := Unmarshal(data, v)
+		if err != nil {
+			continue
+		}
+		score = 1
+
+		m, err := Marshal(v)
+		if err != nil {
+			fmt.Printf("v=%#v\n", v)
+			panic(err)
+		}
+
+		u := ctor()
+		err = Unmarshal(m, u)
+		if err != nil {
+			fmt.Printf("v=%#v\n", v)
+			fmt.Printf("m=%s\n", m)
+			panic(err)
+		}
+	}
+
+	return
+}