[FAB-3461] Gossip protobuff test coverage

This change set improves the test coverage of the generated code
in protos/gossip and makes the code coverage of the total package
to be >= 85%.

Change-Id: Ib5e1eddf4c4feee94d81f750f4d4fbf87e52019f
Signed-off-by: Yacov Manevich <yacovm@il.ibm.com>

protos/gossip/message_test.go

@@ -0,0 +1,197 @@
+/*
+Copyright IBM Corp. 2017 All Rights Reserved.
+
+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 gossip
+
+import (
+	"reflect"
+	"testing"
+
+	"github.com/golang/protobuf/proto"
+	"github.com/stretchr/testify/assert"
+)
+
+type protoMsg interface {
+	Reset()
+	String() string
+	ProtoMessage()
+	Descriptor() ([]byte, []int)
+}
+
+func TestMethods(t *testing.T) {
+	msgs := []protoMsg{
+		&Envelope{},
+		&SecretEnvelope{},
+		&GossipMessage{},
+		&Secret{},
+		&StateInfo{},
+		&ConnEstablish{},
+		&AliveMessage{},
+		&MembershipRequest{},
+		&MembershipResponse{},
+		&DataMessage{},
+		&GossipHello{},
+		&DataDigest{},
+		&DataRequest{},
+		&DataUpdate{},
+		&Empty{},
+		&StateInfoSnapshot{},
+		&StateInfoPullRequest{},
+		&RemoteStateRequest{},
+		&RemoteStateResponse{},
+		&LeadershipMessage{},
+		&PeerIdentity{},
+	}
+
+	for _, msg := range msgs {
+		msg.Reset()
+		_, _ = msg.Descriptor()
+		msg.ProtoMessage()
+		assert.Empty(t, msg.String())
+
+	}
+
+	contentTypes := []isGossipMessage_Content{
+		&GossipMessage_AliveMsg{},
+		&GossipMessage_MemReq{},
+		&GossipMessage_MemRes{},
+		&GossipMessage_DataMsg{},
+		&GossipMessage_Hello{},
+		&GossipMessage_DataDig{},
+		&GossipMessage_DataReq{},
+		&GossipMessage_DataUpdate{},
+		&GossipMessage_Empty{},
+		&GossipMessage_Conn{},
+		&GossipMessage_StateInfo{},
+		&GossipMessage_StateSnapshot{},
+		&GossipMessage_StateInfoPullReq{},
+		&GossipMessage_StateRequest{},
+		&GossipMessage_StateResponse{},
+		&GossipMessage_LeadershipMsg{},
+		&GossipMessage_PeerIdentity{},
+	}
+
+	for _, ct := range contentTypes {
+		ct.isGossipMessage_Content()
+		gMsg := &GossipMessage{
+			Content: ct,
+		}
+		v := reflect.ValueOf(gMsg)
+		for i := 0; i < v.NumMethod(); i++ {
+			func() {
+				defer func() {
+					recover()
+				}()
+				v.Method(i).Call([]reflect.Value{})
+			}()
+		}
+		gMsg = &GossipMessage{
+			Content: ct,
+		}
+		_GossipMessage_OneofSizer(gMsg)
+		gMsg = &GossipMessage{
+			Content: ct,
+		}
+		_GossipMessage_OneofMarshaler(gMsg, &proto.Buffer{})
+		gMsg = &GossipMessage{
+			Content: ct,
+		}
+
+		for i := 5; i < 22; i++ {
+			_GossipMessage_OneofUnmarshaler(gMsg, i, 2, &proto.Buffer{})
+		}
+	}
+
+	assert.NotZero(t, _Secret_OneofSizer(&Secret{
+		Content: &Secret_InternalEndpoint{
+			InternalEndpoint: "internalEndpoint",
+		},
+	}))
+
+	assert.Nil(t, (&Envelope{}).GetSecretEnvelope())
+}
+
+func TestGrpc(t *testing.T) {
+	cl := NewGossipClient(nil)
+	f1 := func() {
+		cl.GossipStream(nil)
+	}
+	assert.Panics(t, f1)
+	f2 := func() {
+		cl.Ping(nil, nil)
+	}
+	assert.Panics(t, f2)
+	gscl := &gossipGossipStreamClient{}
+	f3 := func() {
+		gscl.Send(nil)
+	}
+	assert.Panics(t, f3)
+	f4 := func() {
+		gscl.Recv()
+	}
+	assert.Panics(t, f4)
+	f5 := func() {
+		gscl.Header()
+	}
+	assert.Panics(t, f5)
+	f6 := func() {
+		gscl.CloseSend()
+	}
+	assert.Panics(t, f6)
+	f7 := func() {
+		gscl.Context()
+	}
+	assert.Panics(t, f7)
+	gss := &gossipGossipStreamServer{}
+	f8 := func() {
+		gss.Recv()
+	}
+	assert.Panics(t, f8)
+	f9 := func() {
+		gss.Send(nil)
+	}
+	assert.Panics(t, f9)
+	f10 := func() {
+		gss.Context()
+	}
+	assert.Panics(t, f10)
+	f11 := func() {
+		gss.RecvMsg(nil)
+	}
+	assert.Panics(t, f11)
+	f12 := func() {
+		gss.SendHeader(nil)
+	}
+	assert.Panics(t, f12)
+	f13 := func() {
+		gss.RecvMsg(nil)
+	}
+	assert.Panics(t, f13)
+	f14 := func() {
+		gss.SendMsg(nil)
+	}
+	assert.Panics(t, f14)
+	f15 := func() {
+		gss.SetTrailer(nil)
+	}
+	assert.Panics(t, f15)
+	f16 := func() {
+		_Gossip_Ping_Handler(nil, nil, func(interface{}) error {
+			return nil
+		}, nil)
+	}
+	assert.Panics(t, f16)
+}