add test case for demonstrating panic

frontend/udp/frontend_test.go

@@ -0,0 +1,28 @@
+package udp_test
+
+import (
+	"testing"
+
+	"github.com/chihaya/chihaya/frontend/udp"
+	"github.com/chihaya/chihaya/middleware"
+	"github.com/chihaya/chihaya/storage"
+	_ "github.com/chihaya/chihaya/storage/memory"
+)
+
+func TestStartStopRaceIssue437(t *testing.T) {
+	ps, err := storage.NewPeerStore("memory", nil)
+	if err != nil {
+		t.Fatal(err)
+	}
+	var responseConfig middleware.ResponseConfig
+	lgc := middleware.NewLogic(responseConfig, ps, nil, nil)
+	fe, err := udp.NewFrontend(lgc, udp.Config{Addr: "127.0.0.1:0"})
+	if err != nil {
+		t.Fatal(err)
+	}
+	errC := fe.Stop()
+	errs := <-errC
+	if len(errs) != 0 {
+		t.Fatal(errs[0])
+	}
+}