add fuzz example

txpool/pool_fuzz.go

@@ -0,0 +1,28 @@
+// +build gofuzzbeta
+
+package txpool
+
+// https://blog.golang.org/fuzz-beta
+// golang.org/s/draft-fuzzing-design
+//gotip doc testing
+//gotip doc testing.F
+//gotip doc testing.F.Add
+//gotip doc testing.F.Fuzz
+
+func FuzzParseQuery(f *testing.F) {
+	f.Add("x=1&y=2")
+	f.Fuzz(func(t *testing.T, queryStr string) {
+		query, err := url.ParseQuery(queryStr)
+		if err != nil {
+			t.Skip()
+		}
+		queryStr2 := query.Encode()
+		query2, err := url.ParseQuery(queryStr2)
+		if err != nil {
+			t.Fatalf("ParseQuery failed to decode a valid encoded query %s: %v", queryStr2, err)
+		}
+		if !reflect.DeepEqual(query, query2) {
+			t.Errorf("ParseQuery gave different query after being encoded\nbefore: %v\nafter: %v", query, query2)
+		}
+	})
+}