[FAB-3545] Improve unit test coverage for provisional

Improve unit test coverage for common/configtx/tool/provisional.
This change set improves the test coverage from 77% to 86%.

Change-Id: Ifc82ab1c2597114636ad754b5616ac6cae121a44
Signed-off-by: Yuki Kondo <yuki.kondo@hal.hitachi.com>

common/configtx/tool/provisional/provisional_test.go

@@ -22,14 +22,17 @@ import (
 
 	genesisconfig "github.com/hyperledger/fabric/common/configtx/tool/localconfig"
 	cb "github.com/hyperledger/fabric/protos/common"
+	"github.com/stretchr/testify/assert"
 )
 
 var confSolo *genesisconfig.Profile
+var confKafka *genesisconfig.Profile
 var testCases []*genesisconfig.Profile
 
 func init() {
 	confSolo = genesisconfig.Load(genesisconfig.SampleSingleMSPSoloProfile)
-	testCases = []*genesisconfig.Profile{confSolo}
+	confKafka = genesisconfig.Load("SampleInsecureKafka")
+	testCases = []*genesisconfig.Profile{confSolo, confKafka}
 }
 
 func TestGenesisBlockHeader(t *testing.T) {
@@ -58,3 +61,13 @@ func TestGenesisMetadata(t *testing.T) {
 		}
 	}
 }
+
+func TestGenesisBlockForChannelHeader(t *testing.T) {
+	expectedHeaderNumber := uint64(0)
+
+	for _, tc := range testCases {
+		genesisBlock := New(tc).GenesisBlockForChannel("mychannel")
+		assert.Equal(t, expectedHeaderNumber, genesisBlock.Header.Number, "Case %s: Header number should be equal", tc.Orderer.OrdererType)
+		assert.Nil(t, genesisBlock.Header.PreviousHash, "Case %s: Header previousHash to be nil", tc.Orderer.OrdererType)
+	}
+}