[FAB-2700] Improve test coverage

https://jira.hyperledger.org/browse/FAB-2700

This simple test addition uses the configtxgen components to drive
config parsing of the two sample configurations.

This improves coverage from 46.9% to 83.4% for the config package.

Change-Id: Ib04561b8027fec17c745049080bed4f27b3b0bd6
Signed-off-by: Jason Yellick <jyellick@us.ibm.com>

common/config/realconfig_test.go

@@ -0,0 +1,85 @@
+/*
+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 config_test
+
+import (
+	"os"
+	"testing"
+
+	. "github.com/hyperledger/fabric/common/config"
+	"github.com/hyperledger/fabric/common/config/msp"
+	"github.com/hyperledger/fabric/common/configtx"
+	"github.com/hyperledger/fabric/common/configtx/tool/localconfig"
+	"github.com/hyperledger/fabric/common/configtx/tool/provisional"
+	cb "github.com/hyperledger/fabric/protos/common"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func init() {
+	// We are in fabric/common/config/ but need to execute from fabric/
+	err := os.Chdir("../..")
+	if err != nil {
+		panic(err)
+	}
+}
+
+const tx = "foo"
+
+func driveConfig(t *testing.T, configGroup *cb.ConfigGroup, proposer ValueProposer) {
+	var groups []string
+	for key := range configGroup.Groups {
+		groups = append(groups, key)
+	}
+
+	vd, vp, err := proposer.BeginValueProposals(tx, groups)
+	assert.NoError(t, err, "BeginValueProposal failed")
+
+	for i, groupName := range groups {
+		driveConfig(t, configGroup.Groups[groupName], vp[i])
+	}
+
+	for key, value := range configGroup.Values {
+		_, err := vd.Deserialize(key, value.Value)
+		assert.NoError(t, err, "Value failed to deserialize")
+	}
+
+	err = proposer.PreCommit(tx)
+	assert.NoError(t, err, "PreCommit failed")
+
+	proposer.CommitProposals(tx)
+}
+
+func commonTest(t *testing.T, profile string) {
+	conf := localconfig.Load(profile)
+	configUpdateEnv, err := provisional.New(conf).ChannelTemplate().Envelope("foo")
+	assert.NoError(t, err, "Generating config failed")
+
+	configUpdate := configtx.UnmarshalConfigUpdateOrPanic(configUpdateEnv.ConfigUpdate)
+	root := NewRoot(msp.NewMSPConfigHandler())
+	preChannel := cb.NewConfigGroup()
+	preChannel.Groups[ChannelGroupKey] = configUpdate.WriteSet
+	driveConfig(t, preChannel, root)
+}
+
+func TestSimpleConfig(t *testing.T) {
+	commonTest(t, localconfig.SampleInsecureProfile)
+}
+
+func TestOneMSPConfig(t *testing.T) {
+	commonTest(t, localconfig.SampleSingleMSPSoloProfile)
+}