Add MySQL fuzzy prase packet test (#11892)

lib/srv/db/mysql/protocol/fuzz_test.go

@@ -0,0 +1,44 @@
+//go:build go1.18
+
+/*
+Copyright 2022 Gravitational, Inc.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package protocol
+
+import (
+	"bytes"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+func FuzzParsePacket(f *testing.F) {
+	testcases := [][]byte{
+		{},
+		[]byte("00000"),
+	}
+
+	for _, tc := range testcases {
+		f.Add(tc)
+	}
+
+	f.Fuzz(func(t *testing.T, packet []byte) {
+		r := bytes.NewReader(packet)
+		require.NotPanics(t, func() {
+			_, _ = ParsePacket(r)
+		})
+	})
+}