bgp_race_test: Unit test to detect data races

This patch adds UT file to detect data races when serializing BGP UPDATE
messages.

Example of Usage:
$ go test -race github.com/osrg/gobgp/packet/bgp -run ^Test_RaceCondition$

Signed-off-by: IWASE Yusuke <iwase.yusuke0@gmail.com>

2 files changed, 47 insertions, 0 deletions

diff --git a/.travis.yml b/.travis.yml
index 48b6f446..808c1143 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -9,6 +9,7 @@ _unittest: &_unittest
   <<: *_dep_ensure
   script:
     - go test $(go list ./... | grep -v '/vendor/')
+    - if [ "$(go env GOARCH)" = "amd64" ]; then go test -race github.com/osrg/gobgp/packet/bgp -run ^Test_RaceCondition$; else echo 'skip'; fi
     - go build -o ./gobgp/gobgp   ./gobgp/
     - go build -o ./gobgpd/gobgpd ./gobgpd/
 
diff --git a/packet/bgp/bgp_race_test.go b/packet/bgp/bgp_race_test.go
new file mode 100644
index 00000000..08038200
--- /dev/null
+++ b/packet/bgp/bgp_race_test.go
@@ -0,0 +1,46 @@
+// Copyright (C) 2018 Nippon Telegraph and Telephone Corporation.
+//
+// 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.
+
+// +build race
+
+package bgp
+
+import (
+	"testing"
+	"time"
+)
+
+// Test_RaceCondition detects data races when serialization.
+// Currently tests only attributes contained in UPDATE message.
+func Test_RaceCondition(t *testing.T) {
+	m := NewTestBGPUpdateMessage()
+	updateBody := m.Body.(*BGPUpdate)
+
+	go func(body *BGPUpdate) {
+		for _, v := range body.WithdrawnRoutes {
+			v.Serialize()
+		}
+		for _, v := range body.PathAttributes {
+			v.Serialize()
+		}
+		for _, v := range body.NLRI {
+			v.Serialize()
+		}
+	}(updateBody)
+
+	time.Sleep(time.Second)
+
+	updateBody.Serialize()
+}