Add unittest of writting config block synchronously for BlockWriter

Signed-off-by: alexzcdu <alexzcdu@tencent.com>

orderer/common/multichannel/blockwriter_test.go

@@ -252,6 +252,50 @@ func TestGoodWriteConfig(t *testing.T) {
 	require.Equal(t, consenterMetadata, omd.Value)
 }
 
+func TestWriteConfigSynchronously(t *testing.T) {
+	confSys := genesisconfig.Load(genesisconfig.SampleInsecureSoloProfile, configtest.GetDevConfigDir())
+	genesisBlockSys := encoder.New(confSys).GenesisBlock()
+
+	tmpdir, err := ioutil.TempDir("", "file-ledger")
+	require.NoError(t, err)
+	defer os.RemoveAll(tmpdir)
+
+	_, l := newLedgerAndFactory(tmpdir, "testchannelid", genesisBlockSys)
+
+	fakeConfig := &mock.OrdererConfig{}
+	fakeConfig.ConsensusTypeReturns("solo")
+
+	cryptoProvider, err := sw.NewDefaultSecurityLevelWithKeystore(sw.NewDummyKeyStore())
+	require.NoError(t, err)
+
+	mockValidator := &mocks.ConfigTXValidator{}
+	mockValidator.ChannelIDReturns("testchannelid")
+	bw := newBlockWriter(genesisBlockSys, nil,
+		&mockBlockWriterSupport{
+			SignerSerializer:  mockCrypto(),
+			ReadWriter:        l,
+			ConfigTXValidator: mockValidator,
+			fakeConfig:        fakeConfig,
+			bccsp:             cryptoProvider,
+		},
+	)
+
+	ctx := makeConfigTxFull("testchannelid", 1)
+	block := protoutil.NewBlock(1, protoutil.BlockHeaderHash(genesisBlockSys.Header))
+	block.Data.Data = [][]byte{protoutil.MarshalOrPanic(ctx)}
+	consenterMetadata := []byte("foo")
+	bw.WriteConfigBlock(block, consenterMetadata)
+
+	cBlock, err := blockledger.GetBlockByNumber(l, block.Header.Number)
+	require.Nil(t, err)
+	require.Equal(t, block.Header, cBlock.Header)
+	require.Equal(t, block.Data, cBlock.Data)
+
+	omd, err := protoutil.GetConsenterMetadataFromBlock(block)
+	require.NoError(t, err)
+	require.Equal(t, consenterMetadata, omd.Value)
+}
+
 func TestMigrationWriteConfig(t *testing.T) {
 	confSys := genesisconfig.Load(genesisconfig.SampleInsecureSoloProfile, configtest.GetDevConfigDir())
 	genesisBlockSys := encoder.New(confSys).GenesisBlock()