Add pingpong mock

pkg/pingpong/mock/mock.go

+// Copyright 2020 The Swarm Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package mock
+
+import (
+	"context"
+	"time"
+)
+
+type Service struct {
+	pingFunc func(ctx context.Context, address string, msgs ...string) (rtt time.Duration, err error)
+}
+
+func New(pingFunc func(ctx context.Context, address string, msgs ...string) (rtt time.Duration, err error)) *Service {
+	return &Service{pingFunc: pingFunc}
+}
+
+func (s *Service) Ping(ctx context.Context, address string, msgs ...string) (rtt time.Duration, err error) {
+	return s.pingFunc(ctx, address, msgs...)
+}

pkg/pingpong/pingpong.go

@@ -21,6 +21,10 @@ const (
 	streamVersion = "1.0.0"
 )
 
+type Interface interface {
+	Ping(ctx context.Context, address string, msgs ...string) (rtt time.Duration, err error)
+}
+
 type Service struct {
 	streamer p2p.Streamer
 	logger   Logger