[FAB-6767] mock utils in SDK-GO

Reason:
1.) Relieving fabric-ext and snaps from some dependencies added for the sake of in unit-tests
2.) Duplicate mock codes between sdk-go, snaps and ext

Change-Id: I5524780e05885269732329d62267206400e36875
Signed-off-by: Sudesh Shetty <sudesh.shetty@securekey.com>

Author: sudeshrshetty

pkg/fabric-client/mocks/mockendorserserver.go

@@ -13,7 +13,11 @@ import (
 	rwsetutil "github.com/hyperledger/fabric-sdk-go/internal/github.com/hyperledger/fabric/core/ledger/kvledger/txmgmt/rwsetutil"
 	kvrwset "github.com/hyperledger/fabric-sdk-go/third_party/github.com/hyperledger/fabric/protos/ledger/rwset/kvrwset"
 
+	"fmt"
+	"net"
+
 	pb "github.com/hyperledger/fabric-sdk-go/third_party/github.com/hyperledger/fabric/protos/peer"
+	"google.golang.org/grpc"
 )
 
 // MockEndorserServer mock endoreser server to process endorsement proposals
@@ -68,3 +72,17 @@ func (m *MockEndorserServer) createProposalResponsePayload() []byte {
 	}
 	return prpBytes
 }
+
+//StartEndorserServer starts mock server for unit testing purpose
+func StartEndorserServer(endorserTestURL string) *MockEndorserServer {
+	grpcServer := grpc.NewServer()
+	lis, err := net.Listen("tcp", endorserTestURL)
+	if err != nil {
+		panic(fmt.Sprintf("Error starting endorser server: %s", err))
+	}
+	endorserServer := &MockEndorserServer{}
+	pb.RegisterEndorserServer(grpcServer, endorserServer)
+	fmt.Printf("Test endorser server started\n")
+	go grpcServer.Serve(lis)
+	return endorserServer
+}

pkg/fabric-client/mocks/mockeventserver.go

@@ -0,0 +1,69 @@
+/*
+Copyright SecureKey Technologies Inc. All Rights Reserved.
+
+SPDX-License-Identifier: Apache-2.0
+*/
+
+package mocks
+
+import (
+	"fmt"
+	"net"
+
+	"github.com/golang/protobuf/proto"
+	pb "github.com/hyperledger/fabric-sdk-go/third_party/github.com/hyperledger/fabric/protos/peer"
+	"google.golang.org/grpc"
+)
+
+// MockEventServer ...
+type MockEventServer struct {
+	server     pb.Events_ChatServer
+	grpcServer *grpc.Server
+	channel    chan *pb.Event
+}
+
+// StartMockEventServer will start mock event server for unit testing purpose
+func StartMockEventServer(testAddress string) (*MockEventServer, error) {
+	grpcServer := grpc.NewServer()
+	grpcServer.GetServiceInfo()
+	lis, err := net.Listen("tcp", testAddress)
+	if err != nil {
+		return nil, fmt.Errorf("Error starting test server %s", err)
+	}
+	eventServer := &MockEventServer{grpcServer: grpcServer}
+	pb.RegisterEventsServer(grpcServer, eventServer)
+	fmt.Printf("Starting test server\n")
+	go grpcServer.Serve(lis)
+
+	return eventServer, nil
+}
+
+// Chat for event chatting
+func (m *MockEventServer) Chat(srv pb.Events_ChatServer) error {
+	m.server = srv
+	m.channel = make(chan *pb.Event)
+	in, _ := srv.Recv()
+	evt := &pb.Event{}
+	err := proto.Unmarshal(in.EventBytes, evt)
+	if err != nil {
+		return fmt.Errorf("error unmarshaling the event bytes in the SignedEvent: %s", err)
+	}
+	switch evt.Event.(type) {
+	case *pb.Event_Register:
+		srv.Send(&pb.Event{Event: &pb.Event_Register{Register: &pb.Register{}}})
+	}
+	for {
+		event := <-m.channel
+		srv.Send(event)
+	}
+}
+
+// SendMockEvent used for sending mock events to event server
+func (m *MockEventServer) SendMockEvent(event *pb.Event) {
+	m.channel <- event
+}
+
+// Stop mock event
+func (m *MockEventServer) Stop() {
+	m.grpcServer.Stop()
+}